An analytical method used in determining the identity of a chemical based on its mass using mass analyzers/mass spectrometers.
A mass spectrometry technique using two (MS/MS) or more mass analyzers. With two in tandem, the precursor ions are mass-selected by a first mass analyzer, and focused into a collision region where they are then fragmented into product ions which are then characterized by a second mass analyzer. A variety of techniques are used to separate the compounds, ionize them, and introduce them to the first mass analyzer. For example, for in GC-MS/MS, GAS CHROMATOGRAPHY-MASS SPECTROMETRY is involved in separating relatively small compounds by GAS CHROMATOGRAPHY prior to injecting them into an ionization chamber for the mass selection.
A mass spectrometry technique used for analysis of nonvolatile compounds such as proteins and macromolecules. The technique involves preparing electrically charged droplets from analyte molecules dissolved in solvent. The electrically charged droplets enter a vacuum chamber where the solvent is evaporated. Evaporation of solvent reduces the droplet size, thereby increasing the coulombic repulsion within the droplet. As the charged droplets get smaller, the excess charge within them causes them to disintegrate and release analyte molecules. The volatilized analyte molecules are then analyzed by mass spectrometry.
A mass spectrometric technique that is used for the analysis of large biomolecules. Analyte molecules are embedded in an excess matrix of small organic molecules that show a high resonant absorption at the laser wavelength used. The matrix absorbs the laser energy, thus inducing a soft disintegration of the sample-matrix mixture into free (gas phase) matrix and analyte molecules and molecular ions. In general, only molecular ions of the analyte molecules are produced, and almost no fragmentation occurs. This makes the method well suited for molecular weight determinations and mixture analysis.
A microanalytical technique combining mass spectrometry and gas chromatography for the qualitative as well as quantitative determinations of compounds.
Chromatographic techniques in which the mobile phase is a liquid.
Liquid chromatographic techniques which feature high inlet pressures, high sensitivity, and high speed.
The systematic study of the complete complement of proteins (PROTEOME) of organisms.
A mass-spectrometric technique that is used for microscopic chemical analysis. A beam of primary ions with an energy of 5-20 kiloelectronvolts (keV) bombards a small spot on the surface of the sample under ultra-high vacuum conditions. Positive and negative secondary ions sputtered from the surface are analyzed in a mass spectrometer in regards to their mass-to-charge ratio. Digital imaging can be generated from the secondary ion beams and their intensity can be measured. Ionic images can be correlated with images from light or other microscopy providing useful tools in the study of molecular and drug actions.
The protein complement of an organism coded for by its genome.
Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories.
The order of amino acids as they occur in a polypeptide chain. This is referred to as the primary structure of proteins. It is of fundamental importance in determining PROTEIN CONFORMATION.
A mass spectrometric technique that is used for the analysis of a wide range of biomolecules, such as glycoalkaloids, glycoproteins, polysaccharides, and peptides. Positive and negative fast atom bombardment spectra are recorded on a mass spectrometer fitted with an atom gun with xenon as the customary beam. The mass spectra obtained contain molecular weight recognition as well as sequence information.
Electrophoresis in which a second perpendicular electrophoretic transport is performed on the separate components resulting from the first electrophoresis. This technique is usually performed on polyacrylamide gels.
A research technique to measure solvent exposed regions of molecules that is used to provide insight about PROTEIN CONFORMATION.
Members of the class of compounds composed of AMINO ACIDS joined together by peptide bonds between adjacent amino acids into linear, branched or cyclical structures. OLIGOPEPTIDES are composed of approximately 2-12 amino acids. Polypeptides are composed of approximately 13 or more amino acids. PROTEINS are linear polypeptides that are normally synthesized on RIBOSOMES.
Techniques for labeling a substance with a stable or radioactive isotope. It is not used for articles involving labeled substances unless the methods of labeling are substantively discussed. Tracers that may be labeled include chemical substances, cells, or microorganisms.
The location of the atoms, groups or ions relative to one another in a molecule, as well as the number, type and location of covalent bonds.
Analysis of PEPTIDES that are generated from the digestion or fragmentation of a protein or mixture of PROTEINS, by ELECTROPHORESIS; CHROMATOGRAPHY; or MASS SPECTROMETRY. The resulting peptide fingerprints are analyzed for a variety of purposes including the identification of the proteins in a sample, GENETIC POLYMORPHISMS, patterns of gene expression, and patterns diagnostic for diseases.
The statistical reproducibility of measurements (often in a clinical context), including the testing of instrumentation or techniques to obtain reproducible results. The concept includes reproducibility of physiological measurements, which may be used to develop rules to assess probability or prognosis, or response to a stimulus; reproducibility of occurrence of a condition; and reproducibility of experimental results.
A basis of value established for the measure of quantity, weight, extent or quality, e.g. weight standards, standard solutions, methods, techniques, and procedures used in diagnosis and therapy.
Determination, by measurement or comparison with a standard, of the correct value of each scale reading on a meter or other measuring instrument; or determination of the settings of a control device that correspond to particular values of voltage, current, frequency or other output.
Spectroscopic method of measuring the magnetic moment of elementary particles such as atomic nuclei, protons or electrons. It is employed in clinical applications such as NMR Tomography (MAGNETIC RESONANCE IMAGING).
An extraction method that separates analytes using a solid phase and a liquid phase. It is used for preparative sample cleanup before analysis by CHROMATOGRAPHY and other analytical methods.
Deuterium. The stable isotope of hydrogen. It has one neutron and one proton in the nucleus.
The sequence of carbohydrates within POLYSACCHARIDES; GLYCOPROTEINS; and GLYCOLIPIDS.
Binary classification measures to assess test results. Sensitivity or recall rate is the proportion of true positives. Specificity is the probability of correctly determining the absence of a condition. (From Last, Dictionary of Epidemiology, 2d ed)
Concentration or quantity that is derived from the smallest measure that can be detected with reasonable certainty for a given analytical procedure.
Linear POLYPEPTIDES that are synthesized on RIBOSOMES and may be further modified, crosslinked, cleaved, or assembled into complex proteins with several subunits. The specific sequence of AMINO ACIDS determines the shape the polypeptide will take, during PROTEIN FOLDING, and the function of the protein.
An atom or group of atoms that have a positive or negative electric charge due to a gain (negative charge) or loss (positive charge) of one or more electrons. Atoms with a positive charge are known as CATIONS; those with a negative charge are ANIONS.
An indicator of body density as determined by the relationship of BODY WEIGHT to BODY HEIGHT. BMI=weight (kg)/height squared (m2). BMI correlates with body fat (ADIPOSE TISSUE). Their relationship varies with age and gender. For adults, BMI falls into these categories: below 18.5 (underweight); 18.5-24.9 (normal); 25.0-29.9 (overweight); 30.0 and above (obese). (National Center for Health Statistics, Centers for Disease Control and Prevention)
The systematic identification and quantitation of all the metabolic products of a cell, tissue, organ, or organism under varying conditions. The METABOLOME of a cell or organism is a dynamic collection of metabolites which represent its net response to current conditions.
Partial proteins formed by partial hydrolysis of complete proteins or generated through PROTEIN ENGINEERING techniques.
Detection of drugs that have been abused, overused, or misused, including legal and illegal drugs. Urine screening is the usual method of detection.
Chromatography on thin layers of adsorbents rather than in columns. The adsorbent can be alumina, silica gel, silicates, charcoals, or cellulose. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
Fractionation of a vaporized sample as a consequence of partition between a mobile gaseous phase and a stationary phase held in a column. Two types are gas-solid chromatography, where the fixed phase is a solid, and gas-liquid, in which the stationary phase is a nonvolatile liquid supported on an inert solid matrix.
Analysis based on the mathematical function first formulated by Jean-Baptiste-Joseph Fourier in 1807. The function, known as the Fourier transform, describes the sinusoidal pattern of any fluctuating pattern in the physical world in terms of its amplitude and its phase. It has broad applications in biomedicine, e.g., analysis of the x-ray crystallography data pivotal in identifying the double helical nature of DNA and in analysis of other molecules, including viruses, and the modified back-projection algorithm universally used in computerized tomography imaging, etc. (From Segen, The Dictionary of Modern Medicine, 1992)
Devices for accelerating charged particles in a spiral path by a constant-frequency alternating electric field. This electric field is synchronized with the movement of the particles in a constant magnetic field.
Substances used for the detection, identification, analysis, etc. of chemical, biological, or pathologic processes or conditions. Indicators are substances that change in physical appearance, e.g., color, at or approaching the endpoint of a chemical titration, e.g., on the passage between acidity and alkalinity. Reagents are substances used for the detection or determination of another substance by chemical or microscopical means, especially analysis. Types of reagents are precipitants, solvents, oxidizers, reducers, fluxes, and colorimetric reagents. (From Grant & Hackh's Chemical Dictionary, 5th ed, p301, p499)
Any of various enzymatically catalyzed post-translational modifications of PEPTIDES or PROTEINS in the cell of origin. These modifications include carboxylation; HYDROXYLATION; ACETYLATION; PHOSPHORYLATION; METHYLATION; GLYCOSYLATION; ubiquitination; oxidation; proteolysis; and crosslinking and result in changes in molecular weight and electrophoretic motility.
Atomic species differing in mass number but having the same atomic number. (Grant & Hackh's Chemical Dictionary, 5th ed)
Use of various chemical separation and extraction methods, such as SOLID PHASE EXTRACTION; CHROMATOGRAPHY; and SUPERCRITICAL FLUID EXTRACTION; to prepare samples for analytical measurement of components.
The process in which substances, either endogenous or exogenous, bind to proteins, peptides, enzymes, protein precursors, or allied compounds. Specific protein-binding measures are often used as assays in diagnostic assessments.
A serine endopeptidase that is formed from TRYPSINOGEN in the pancreas. It is converted into its active form by ENTEROPEPTIDASE in the small intestine. It catalyzes hydrolysis of the carboxyl group of either arginine or lysine. EC
The dynamic collection of metabolites which represent a cell's or organism's net metabolic response to current conditions.
Electrophoresis in which a polyacrylamide gel is used as the diffusion medium.
The chemical or biochemical addition of carbohydrate or glycosyl groups to other chemicals, especially peptides or proteins. Glycosyl transferases are used in this biochemical reaction.
Carbohydrates consisting of between two (DISACCHARIDES) and ten MONOSACCHARIDES connected by either an alpha- or beta-glycosidic link. They are found throughout nature in both the free and bound form.
The characteristic 3-dimensional shape of a carbohydrate.
The sum of the weight of all the atoms in a molecule.
A process that includes the determination of AMINO ACID SEQUENCE of a protein (or peptide, oligopeptide or peptide fragment) and the information analysis of the sequence.
The phenomenon whereby certain chemical compounds have structures that are different although the compounds possess the same elemental composition. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 5th ed)
A chromatography technique in which the stationary phase is composed of a non-polar substance with a polar mobile phase, in contrast to normal-phase chromatography in which the stationary phase is a polar substance with a non-polar mobile phase.
A chemical reaction in which an electron is transferred from one molecule to another. The electron-donating molecule is the reducing agent or reductant; the electron-accepting molecule is the oxidizing agent or oxidant. Reducing and oxidizing agents function as conjugate reductant-oxidant pairs or redox pairs (Lehninger, Principles of Biochemistry, 1982, p471).
Methods for assessing flow through a system by injection of a known quantity of an indicator, such as a dye, radionuclide, or chilled liquid, into the system and monitoring its concentration over time at a specific point in the system. (From Dorland, 28th ed)
Domesticated bovine animals of the genus Bos, usually kept on a farm or ranch and used for the production of meat or dairy products or for heavy labor.
A highly-sensitive (in the picomolar range, which is 10,000-fold more sensitive than conventional electrophoresis) and efficient technique that allows separation of PROTEINS; NUCLEIC ACIDS; and CARBOHYDRATES. (Segen, Dictionary of Modern Medicine, 1992)
Models used experimentally or theoretically to study molecular shape, electronic properties, or interactions; includes analogous molecules, computer-generated graphics, and mechanical structures.
Mixtures of many components in inexact proportions, usually natural, such as PLANT EXTRACTS; VENOMS; and MANURE. These are distinguished from DRUG COMBINATIONS which have only a few components in definite proportions.
The chemical alteration of an exogenous substance by or in a biological system. The alteration may inactivate the compound or it may result in the production of an active metabolite of an inactive parent compound. The alterations may be divided into METABOLIC DETOXICATION, PHASE I and METABOLIC DETOXICATION, PHASE II.
Stable oxygen atoms that have the same atomic number as the element oxygen, but differ in atomic weight. O-17 and 18 are stable oxygen isotopes.
The vapor state of matter; nonelastic fluids in which the molecules are in free movement and their mean positions far apart. Gases tend to expand indefinitely, to diffuse and mix readily with other gases, to have definite relations of volume, temperature, and pressure, and to condense or liquefy at low temperatures or under sufficient pressure. (Grant & Hackh's Chemical Dictionary, 5th ed)
Proteins prepared by recombinant DNA technology.
Separation of a mixture in successive stages, each stage removing from the mixture some proportion of one of the substances, for example by differential solubility in water-solvent mixtures. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
Measurable and quantifiable biological parameters (e.g., specific enzyme concentration, specific hormone concentration, specific gene phenotype distribution in a population, presence of biological substances) which serve as indices for health- and physiology-related assessments, such as disease risk, psychiatric disorders, environmental exposure and its effects, disease diagnosis, metabolic processes, substance abuse, pregnancy, cell line development, epidemiologic studies, etc.
Spectrophotometric techniques by which the absorption or emmision spectra of radiation from atoms are produced and analyzed.
Proteins found in any species of bacterium.
The process of cleaving a chemical compound by the addition of a molecule of water.
The development and use of techniques and equipment to study or perform chemical reactions, with small quantities of materials, frequently less than a milligram or a milliliter.
Ligand-binding assays that measure protein-protein, protein-small molecule, or protein-nucleic acid interactions using a very large set of capturing molecules, i.e., those attached separately on a solid support, to measure the presence or interaction of target molecules in the sample.
The application of medical knowledge to questions of law.
The first chemical element in the periodic table. It has the atomic symbol H, atomic number 1, and atomic weight [1.00784; 1.00811]. It exists, under normal conditions, as a colorless, odorless, tasteless, diatomic gas. Hydrogen ions are PROTONS. Besides the common H1 isotope, hydrogen exists as the stable isotope DEUTERIUM and the unstable, radioactive isotope TRITIUM.
The pressure at any point in an atmosphere due solely to the weight of the atmospheric gases above the point concerned.
Elements of limited time intervals, contributing to particular results or situations.
The development and use of techniques to study physical phenomena and construct structures in the nanoscale size range or smaller.
A procedure consisting of a sequence of algebraic formulas and/or logical steps to calculate or determine a given task.
Determination of the spectra of ultraviolet absorption by specific molecules in gases or liquids, for example Cl2, SO2, NO2, CS2, ozone, mercury vapor, and various unsaturated compounds. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
The parts of a macromolecule that directly participate in its specific combination with another molecule.
The rate dynamics in chemical or physical systems.
A spectroscopic technique in which a range of wavelengths is presented simultaneously with an interferometer and the spectrum is mathematically derived from the pattern thus obtained.
Lipids containing at least one monosaccharide residue and either a sphingoid or a ceramide (CERAMIDES). They are subdivided into NEUTRAL GLYCOSPHINGOLIPIDS comprising monoglycosyl- and oligoglycosylsphingoids and monoglycosyl- and oligoglycosylceramides; and ACIDIC GLYCOSPHINGOLIPIDS which comprises sialosylglycosylsphingolipids (GANGLIOSIDES); SULFOGLYCOSPHINGOLIPIDS (formerly known as sulfatides), glycuronoglycosphingolipids, and phospho- and phosphonoglycosphingolipids. (From IUPAC's webpage)
A chromatographic technique that utilizes the ability of biological molecules to bind to certain ligands specifically and reversibly. It is used in protein biochemistry. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
A species of gram-negative, facultatively anaerobic, rod-shaped bacteria (GRAM-NEGATIVE FACULTATIVELY ANAEROBIC RODS) commonly found in the lower part of the intestine of warm-blooded animals. It is usually nonpathogenic, but some strains are known to produce DIARRHEA and pyogenic infections. Pathogenic strains (virotypes) are classified by their specific pathogenic mechanisms such as toxins (ENTEROTOXIGENIC ESCHERICHIA COLI), etc.
The characteristic 3-dimensional shape of a protein, including the secondary, supersecondary (motifs), tertiary (domains) and quaternary structure of the peptide chain. PROTEIN STRUCTURE, QUATERNARY describes the conformation assumed by multimeric proteins (aggregates of more than one polypeptide chain).
The introduction of a phosphoryl group into a compound through the formation of an ester bond between the compound and a phosphorus moiety.
Databases containing information about PROTEINS such as AMINO ACID SEQUENCE; PROTEIN CONFORMATION; and other properties.
Addition of methyl groups. In histo-chemistry methylation is used to esterify carboxyl groups and remove sulfate groups by treating tissue sections with hot methanol in the presence of hydrochloric acid. (From Stedman, 25th ed)
A thiol-containing non-essential amino acid that is oxidized to form CYSTINE.
The degree of similarity between sequences of amino acids. This information is useful for the analyzing genetic relatedness of proteins and species.
The systematic study of the structure and function of the complete set of glycans (the glycome) produced in a single organism and identification of all the genes that encode glycoproteins.
Separation technique in which the stationary phase consists of ion exchange resins. The resins contain loosely held small ions that easily exchange places with other small ions of like charge present in solutions washed over the resins.
Methodologies used for the isolation, identification, detection, and quantitation of chemical substances.
Theoretical representations that simulate the behavior or activity of chemical processes or phenomena; includes the use of mathematical equations, computers, and other electronic equipment.
Stable carbon atoms that have the same atomic number as the element carbon, but differ in atomic weight. C-13 is a stable carbon isotope.
Reagents with two reactive groups, usually at opposite ends of the molecule, that are capable of reacting with and thereby forming bridges between side chains of amino acids in proteins; the locations of naturally reactive areas within proteins can thereby be identified; may also be used for other macromolecules, like glycoproteins, nucleic acids, or other.
A characteristic feature of enzyme activity in relation to the kind of substrate on which the enzyme or catalytic molecule reacts.
The level of protein structure in which combinations of secondary protein structures (alpha helices, beta sheets, loop regions, and motifs) pack together to form folded shapes called domains. Disulfide bridges between cysteines in two different parts of the polypeptide chain along with other interactions between the chains play a role in the formation and stabilization of tertiary structure. Small proteins usually consist of only one domain but larger proteins may contain a number of domains connected by segments of polypeptide chain which lack regular secondary structure.
Sequential operating programs and data which instruct the functioning of a digital computer.
The phenomenon whereby compounds whose molecules have the same number and kind of atoms and the same atomic arrangement, but differ in their spatial relationships. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 5th ed)
Proteins that are present in blood serum, including SERUM ALBUMIN; BLOOD COAGULATION FACTORS; and many other types of proteins.
Organic compounds that have a relatively high VAPOR PRESSURE at room temperature.
An essential amino acid. It is often added to animal feed.
Compounds in which a methyl group is attached to the cyano moiety.
The application of TOXICOLOGY knowledge to questions of law.
Methods for determining interaction between PROTEINS.
Organic compounds that generally contain an amino (-NH2) and a carboxyl (-COOH) group. Twenty alpha-amino acids are the subunits which are polymerized to form proteins.
Stable nitrogen atoms that have the same atomic number as the element nitrogen, but differ in atomic weight. N-15 is a stable nitrogen isotope.
Chemical groups containing the covalent disulfide bonds -S-S-. The sulfur atoms can be bound to inorganic or organic moieties.
The chemical and physical integrity of a pharmaceutical product.
Glycosides of GLUCURONIC ACID formed by the reaction of URIDINE DIPHOSPHATE GLUCURONIC ACID with certain endogenous and exogenous substances. Their formation is important for the detoxification of drugs, steroid excretion and BILIRUBIN metabolism to a more water-soluble compound that can be eliminated in the URINE and BILE.
The sequence of PURINES and PYRIMIDINES in nucleic acids and polynucleotides. It is also called nucleotide sequence.
Identification of proteins or peptides that have been electrophoretically separated by blot transferring from the electrophoresis gel to strips of nitrocellulose paper, followed by labeling with antibody probes.
The normality of a solution with respect to HYDROGEN ions; H+. It is related to acidity measurements in most cases by pH = log 1/2[1/(H+)], where (H+) is the hydrogen ion concentration in gram equivalents per liter of solution. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
Organic, monobasic acids derived from hydrocarbons by the equivalent of oxidation of a methyl group to an alcohol, aldehyde, and then acid. Fatty acids are saturated and unsaturated (FATTY ACIDS, UNSATURATED). (Grant & Hackh's Chemical Dictionary, 5th ed)
Proteins which contain carbohydrate groups attached covalently to the polypeptide chain. The protein moiety is the predominant group with the carbohydrate making up only a small percentage of the total weight.
Established cell cultures that have the potential to propagate indefinitely.
The largest class of organic compounds, including STARCH; GLYCOGEN; CELLULOSE; POLYSACCHARIDES; and simple MONOSACCHARIDES. Carbohydrates are composed of carbon, hydrogen, and oxygen in a ratio of Cn(H2O)n.
A solventless sample preparation method, invented in 1989, that uses a fused silica fiber which is coated with a stationary phase. It is used for sample cleanup before using other analytical methods.
Changes in the amounts of various chemicals (neurotransmitters, receptors, enzymes, and other metabolites) specific to the area of the central nervous system contained within the head. These are monitored over time, during sensory stimulation, or under different disease states.
Any detectable and heritable change in the genetic material that causes a change in the GENOTYPE and which is transmitted to daughter cells and to succeeding generations.
A generic term for fats and lipoids, the alcohol-ether-soluble constituents of protoplasm, which are insoluble in water. They comprise the fats, fatty oils, essential oils, waxes, phospholipids, glycolipids, sulfolipids, aminolipids, chromolipids (lipochromes), and fatty acids. (Grant & Hackh's Chemical Dictionary, 5th ed)
Derivatives of phosphatidic acid in which the hydrophobic regions are composed of two fatty acids and a polar alcohol is joined to the C-3 position of glycerol through a phosphodiester bond. They are named according to their polar head groups, such as phosphatidylcholine and phosphatidylethanolamine.
A filament-like structure consisting of a shaft which projects to the surface of the SKIN from a root which is softer than the shaft and lodges in the cavity of a HAIR FOLLICLE. It is found on most surfaces of the body.
The identification of selected parameters in newborn infants by various tests, examinations, or other procedures. Screening may be performed by clinical or laboratory measures. A screening test is designed to sort out healthy neonates (INFANT, NEWBORN) from those not well, but the screening test is not intended as a diagnostic device, rather instead as epidemiologic.
Any compound containing one or more monosaccharide residues bound by a glycosidic linkage to a hydrophobic moiety such as an acylglycerol (see GLYCERIDES), a sphingoid, a ceramide (CERAMIDES) (N-acylsphingoid) or a prenyl phosphate. (From IUPAC's webpage)
Salts and esters of gentisic acid.
A technique using antibodies for identifying or quantifying a substance. Usually the substance being studied serves as antigen both in antibody production and in measurement of antibody by the test substance.
The arrangement of two or more amino acid or base sequences from an organism or organisms in such a way as to align areas of the sequences sharing common properties. The degree of relatedness or homology between the sequences is predicted computationally or statistically based on weights assigned to the elements aligned between the sequences. This in turn can serve as a potential indicator of the genetic relatedness between the organisms.
The aggregation of soluble ANTIGENS with ANTIBODIES, alone or with antibody binding factors such as ANTI-ANTIBODIES or STAPHYLOCOCCAL PROTEIN A, into complexes large enough to fall out of solution.
Procedures for collecting, preserving, and transporting of specimens sufficiently stable to provide accurate and precise results suitable for clinical interpretation.
Placing of a hydroxyl group on a compound in a position where one did not exist before. (Stedman, 26th ed)
A multistage process that includes the determination of a sequence (protein, carbohydrate, etc.), its fragmentation and analysis, and the interpretation of the resulting sequence information.
Theoretical representations that simulate the behavior or activity of biological processes or diseases. For disease models in living animals, DISEASE MODELS, ANIMAL is available. Biological models include the use of mathematical equations, computers, and other electronic equipment.
A phase transition from liquid state to gas state, which is affected by Raoult's law. It can be accomplished by fractional distillation.
Liquids that dissolve other substances (solutes), generally solids, without any change in chemical composition, as, water containing sugar. (Grant & Hackh's Chemical Dictionary, 5th ed)
A field of biology concerned with the development of techniques for the collection and manipulation of biological data, and the use of such data to make biological discoveries or predictions. This field encompasses all computational methods and theories for solving biological problems including manipulation of models and datasets.
Closed vesicles of fragmented endoplasmic reticulum created when liver cells or tissue are disrupted by homogenization. They may be smooth or rough.
A cell line derived from cultured tumor cells.
Errors in metabolic processes resulting from inborn genetic mutations that are inherited or acquired in utero.
Techniques used to separate mixtures of substances based on differences in the relative affinities of the substances for mobile and stationary phases. A mobile phase (fluid or gas) passes through a column containing a stationary phase of porous solid or liquid coated on a solid support. Usage is both analytical for small amounts and preparative for bulk amounts.
Chromatography on non-ionic gels without regard to the mechanism of solute discrimination.
Cleavage of proteins into smaller peptides or amino acids either by PROTEASES or non-enzymatically (e.g., Hydrolysis). It does not include Protein Processing, Post-Translational.
Proteins found in plants (flowers, herbs, shrubs, trees, etc.). The concept does not include proteins found in vegetables for which VEGETABLE PROTEINS is available.
A large lobed glandular organ in the abdomen of vertebrates that is responsible for detoxification, metabolism, synthesis and storage of various substances.
Mathematical procedure that transforms a number of possibly correlated variables into a smaller number of uncorrelated variables called principal components.
A very strong halogenated derivative of acetic acid. It is used in acid catalyzed reactions, especially those where an ester is cleaved in peptide synthesis.
The covalent bonding of an alkyl group to an organic compound. It can occur by a simple addition reaction or by substitution of another functional group.
Concentrated pharmaceutical preparations of plants obtained by removing active constituents with a suitable solvent, which is evaporated away, and adjusting the residue to a prescribed standard.
An optical source that emits photons in a coherent beam. Light Amplification by Stimulated Emission of Radiation (LASER) is brought about using devices that transform light of varying frequencies into a single intense, nearly nondivergent beam of monochromatic radiation. Lasers operate in the infrared, visible, ultraviolet, or X-ray regions of the spectrum.
The products of chemical reactions that result in the addition of extraneous chemical groups to DNA.
A system for verifying and maintaining a desired level of quality in a product or process by careful planning, use of proper equipment, continued inspection, and corrective action as required. (Random House Unabridged Dictionary, 2d ed)
Large, hoofed mammals of the family EQUIDAE. Horses are active day and night with most of the day spent seeking and consuming food. Feeding peaks occur in the early morning and late afternoon, and there are several daily periods of rest.
Different forms of a protein that may be produced from different GENES, or from the same gene by ALTERNATIVE SPLICING.
The property of objects that determines the direction of heat flow when they are placed in direct thermal contact. The temperature is the energy of microscopic motions (vibrational and translational) of the particles of atoms.
The use of molecularly targeted imaging probes to localize and/or monitor biochemical and cellular processes via various imaging modalities that include RADIONUCLIDE IMAGING; ULTRASONOGRAPHY; MAGNETIC RESONANCE IMAGING; FLUORESCENCE IMAGING; and MICROSCOPY.
Organic compounds containing a carbonyl group in the form -CHO.
An examination of chemicals in the blood.
Oligosaccharides containing two monosaccharide units linked by a glycosidic bond.
Conjugated protein-carbohydrate compounds including mucins, mucoid, and amyloid glycoproteins.
Illegitimate use of substances for a desired effect in competitive sports. It includes humans and animals.
Macromolecular complexes formed from the association of defined protein subunits.
The characteristic three-dimensional shape of a molecule.
The insertion of recombinant DNA molecules from prokaryotic and/or eukaryotic sources into a replicating vehicle, such as a plasmid or virus vector, and the introduction of the resultant hybrid molecules into recipient cells without altering the viability of those cells.
Drugs intended for human or veterinary use, presented in their finished dosage form. Included here are materials used in the preparation and/or formulation of the finished dosage form.
Method for assessing flow through a system by injection of a known quantity of radionuclide into the system and monitoring its concentration over time at a specific point in the system. (From Dorland, 28th ed)
A strain of albino rat used widely for experimental purposes because of its calmness and ease of handling. It was developed by the Sprague-Dawley Animal Company.
Proteins which are found in membranes including cellular and intracellular membranes. They consist of two types, peripheral and integral proteins. They include most membrane-associated enzymes, antigenic proteins, transport proteins, and drug, hormone, and lectin receptors.
Examination of urine by chemical, physical, or microscopic means. Routine urinalysis usually includes performing chemical screening tests, determining specific gravity, observing any unusual color or odor, screening for bacteriuria, and examining the sediment microscopically.
Stable elementary particles having the smallest known negative charge, present in all elements; also called negatrons. Positively charged electrons are called positrons. The numbers, energies and arrangement of electrons around atomic nuclei determine the chemical identities of elements. Beams of electrons are called CATHODE RAYS.
Any compound that contains a constituent sugar, in which the hydroxyl group attached to the first carbon is substituted by an alcoholic, phenolic, or other group. They are named specifically for the sugar contained, such as glucoside (glucose), pentoside (pentose), fructoside (fructose), etc. Upon hydrolysis, a sugar and nonsugar component (aglycone) are formed. (From Dorland, 28th ed; From Miall's Dictionary of Chemistry, 5th ed)
The restriction of a characteristic behavior, anatomical structure or physical system, such as immune response; metabolic response, or gene or gene variant to the members of one species. It refers to that property which differentiates one species from another but it is also used for phylogenetic levels higher or lower than the species.
The removal of a soluble component from a liquid mixture by contact with a second liquid, immiscible with the carrier liquid, in which the component is preferentially soluble. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
Simple sugars, carbohydrates which cannot be decomposed by hydrolysis. They are colorless crystalline substances with a sweet taste and have the same general formula CnH2nOn. (From Dorland, 28th ed)
Spectrophotometry in the infrared region, usually for the purpose of chemical analysis through measurement of absorption spectra associated with rotational and vibrational energy levels of molecules. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
Techniques used in microbiology.
The homogeneous mixtures formed by the mixing of a solid, liquid, or gaseous substance (solute) with a liquid (the solvent), from which the dissolved substances can be recovered by physical processes. (From Grant & Hackh's Chemical Dictionary, 5th ed)
Electropositive chemical elements characterized by ductility, malleability, luster, and conductance of heat and electricity. They can replace the hydrogen of an acid and form bases with hydroxyl radicals. (Grant & Hackh's Chemical Dictionary, 5th ed)
Methods of comparing two or more samples on the same two-dimensional gel electrophoresis gel.
The measurement of the amplitude of the components of a complex waveform throughout the frequency range of the waveform. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
A colorless, flammable liquid used in the manufacture of FORMALDEHYDE and ACETIC ACID, in chemical synthesis, antifreeze, and as a solvent. Ingestion of methanol is toxic and may cause blindness.
Drugs used by veterinarians in the treatment of animal diseases. The veterinarian's pharmacological armamentarium is the counterpart of drugs treating human diseases, with dosage and administration adjusted to the size, weight, disease, and idiosyncrasies of the species. In the United States most drugs are subject to federal regulations with special reference to the safety of drugs and residues in edible animal products.
Cells propagated in vitro in special media conducive to their growth. Cultured cells are used to study developmental, morphologic, metabolic, physiologic, and genetic processes, among others.
Organic compounds containing the -CO-NH2 radical. Amides are derived from acids by replacement of -OH by -NH2 or from ammonia by the replacement of H by an acyl group. (From Grant & Hackh's Chemical Dictionary, 5th ed)
Single chains of amino acids that are the units of multimeric PROTEINS. Multimeric proteins can be composed of identical or non-identical subunits. One or more monomeric subunits may compose a protomer which itself is a subunit structure of a larger assembly.
Californium. A man-made radioactive actinide with atomic symbol Cf, atomic number 98, and atomic weight 251. Its valence can be +2 or +3. Californium has medical use as a radiation source for radiotherapy.
Organic silicon derivatives used to characterize hydroxysteroids, nucleosides, and related compounds. Trimethylsilyl esters of amino acids are used in peptide synthesis.
Benzene derivatives that include one or more hydroxyl groups attached to the ring structure.
Any of various animals that constitute the family Suidae and comprise stout-bodied, short-legged omnivorous mammals with thick skin, usually covered with coarse bristles, a rather long mobile snout, and small tail. Included are the genera Babyrousa, Phacochoerus (wart hogs), and Sus, the latter containing the domestic pig (see SUS SCROFA).
The monitoring of the level of toxins, chemical pollutants, microbial contaminants, or other harmful substances in the environment (soil, air, and water), workplace, or in the bodies of people and animals present in that environment.
Compounds containing the -SH radical.
A basic science concerned with the composition, structure, and properties of matter; and the reactions that occur between substances and the associated energy exchange.
Formation of an acetyl derivative. (Stedman, 25th ed)
Complex sets of enzymatic reactions connected to each other via their product and substrate metabolites.
Molecular products metabolized and secreted by neoplastic tissue and characterized biochemically in cells or body fluids. They are indicators of tumor stage and grade as well as useful for monitoring responses to treatment and predicting recurrence. Many chemical groups are represented including hormones, antigens, amino and nucleic acids, enzymes, polyamines, and specific cell membrane proteins and lipids.
Derivatives of GLUCURONIC ACID. Included under this heading are a broad variety of acid forms, salts, esters, and amides that include the 6-carboxy glucose structure.
Hydroxycinnamic acid and its derivatives. Act as activators of the indoleacetic acid oxidizing system, thereby producing a decrease in the endogenous level of bound indoleacetic acid in plants.
A set of statistical methods used to group variables or observations into strongly inter-related subgroups. In epidemiology, it may be used to analyze a closely grouped series of events or cases of disease or other health-related phenomenon with well-defined distribution patterns in relation to time or place or both.
A deoxyribonucleotide polymer that is the primary genetic material of all cells. Eukaryotic and prokaryotic organisms normally contain DNA in a double-stranded state, yet several important biological processes transiently involve single-stranded regions. DNA, which consists of a polysugar-phosphate backbone possessing projections of purines (adenine and guanine) and pyrimidines (thymine and cytosine), forms a double helix that is held together by hydrogen bonds between these purines and pyrimidines (adenine to thymine and guanine to cytosine).
Lipid A is the biologically active component of lipopolysaccharides. It shows strong endotoxic activity and exhibits immunogenic properties.

Less common "doping" agents and substances encountered during routine screening for drugs. (1/17751)

The chromatographic and spectroscopic properties of several unusual substances which have been detected in the "alkaloidal" chloroform extract from racehorse urine and saliva samples are reported. Some of these substances have been identified by combined gas chromatography-mass spectrometry and the source of the substance is stated where this is known. Other substances whose identity is not known have been detected and their mass spectra show characteristic amine fragments. The occurrence of these unidentified substances is more frequent in aged urine samples and it would therefore appear that they are associated with putrefaction.  (+info)

Urinary lithium: distribution shape, reference values, and evaluation of exposure by inductively coupled plasma argon-emission spectrometry. (2/17751)

Inductively coupled plasma argon-emission spectrometry (ICPAES) was used to evaluate the lithium content of undiluted urine samples. The method can be performed with 1 mL of urine in a single tube using a routine ICPAES analysis for rapid and convenient assessment of lithium exposure in humans. Urine samples obtained from male workers (n = 86) who had not been exposed to lithium were used for the determination of this element by ICPAES. The obtained concentrations were corrected using a specific gravity of 1.024. The particular frequency distribution resulted in a log-normal distribution diagram for anatomical spread. Geometric mean value for urinary lithium in the nonexposed male workers was 23.5 microg/L, and the confidence interval from a log-normal distribution was 11.0 to 50.5 microg/L. Taking into consideration a short biological half-life and the massive urine excretion of lithium, urinary lithium was considered to be a useful index for monitoring of exposure. Calibration curves obtained for lithium standards had good sensitivity and linearity. Good reproducibility was assessed by lithium addition to urine samples. It was concluded that the obtained lithium reference values would be useful for the early diagnosis of lithium intoxication or in the assessment of the degree of exposure to lithium in subjects at risk.  (+info)

Archive of mass spectral data files on recordable CD-ROMs and creation and maintenance of a searchable computerized database. (3/17751)

A database containing names of mass spectral data files generated in a forensic toxicology laboratory and two Microsoft Visual Basic programs to maintain and search this database is described. The data files (approximately 0.5 KB/each) were collected from six mass spectrometers during routine casework. Data files were archived on 650 MB (74 min) recordable CD-ROMs. Each recordable CD-ROM was given a unique name, and its list of data file names was placed into the database. The present manuscript describes the use of search and maintenance programs for searching and routine upkeep of the database and creation of CD-ROMs for archiving of data files.  (+info)

UV irradiation of polycyclic aromatic hydrocarbons in ices: production of alcohols, quinones, and ethers. (4/17751)

Polycyclic aromatic hydrocarbons (PAHs) in water ice were exposed to ultraviolet (UV) radiation under astrophysical conditions, and the products were analyzed by infrared spectroscopy and mass spectrometry. Peripheral carbon atoms were oxidized, producing aromatic alcohols, ketones, and ethers, and reduced, producing partially hydrogenated aromatic hydrocarbons, molecules that account for the interstellar 3.4-micrometer emission feature. These classes of compounds are all present in carbonaceous meteorites. Hydrogen and deuterium atoms exchange readily between the PAHs and the ice, which may explain the deuterium enrichments found in certain meteoritic molecules. This work has important implications for extraterrestrial organics in biogenesis.  (+info)

Relationship between UDP-glucose 4-epimerase activity and oligoglucose glycoforms in two strains of Neisseria meningitidis. (5/17751)

Sodium dodecyl sulfate-polyacrylamide gel analysis of lipooligosaccharide (LOS) from Neisseria meningitidis has demonstrated considerable microheterogeneity in the variable region of LOS due to the presence of novel glycoforms. As a step toward understanding the basis for the expression of these novel glycoforms, we have examined the LOS structures and UDP-glucose 4-epimerase (epimerase) activity levels in two strains (NMB and MA-1) and their respective galE mutants. Strain NMB was found to have low epimerase activity and to contain multiple glycoforms, some of which appear to contain only glucose sugars. The galE mutant had only the oligoglucose glycoforms. Strain MA-1 had higher epimerase activity at both log and stationary phases (2- and 12.5-fold, respectively) and one glycoform with a putative lactosyl structure. Strain MA-1 galE had two glycoforms that contained one or two glucose residues. To understand the molecular basis for the different epimerase activities, we examined the predicted amino acid sequences of the respective galE open reading frames and determined the relative amounts of GalE protein. We found no significant differences between the predicted amino acid sequence of the GalE protein in NMB and that in MA-1. We observed no significant differences in the level of GalE protein between MA-1 and NMB at exponential or stationary phase. We also observed an 8.2-fold drop in epimerase activity in NMB between the log and stationary phases that was not due to the GalE protein level or low glucose levels.  (+info)

Insulin-like growth factors I and II are unable to form and maintain their native disulfides under in vivo redox conditions. (6/17751)

Insulin-like growth factor (IGF) I does not quantitatively form its three native disulfide bonds in the presence of 10 mM reduced and 1 mM oxidized glutathione in vitro [Hober, S. et al. (1992) Biochemistry 31, 1749-1756]. In this paper, we show (i) that both IGF-I and IGF-II are unable to form and maintain their native disulfide bonds at redox conditions that are similar to the situation in the secretory vesicles in vivo and (ii) that the presence of protein disulfide isomerase does not overcome this problem. The results indicate that the previously described thermodynamic disulfide exchange folding problem of IGF-I in vitro is also present in vivo. Speculatively, we suggest that the thermodynamic disulfide exchange properties of IGF-I and II are biologically significant for inactivation of the unbound growth factors by disulfide exchange reactions to generate variants destined for rapid clearance.  (+info)

Purification and identification of a novel subunit of protein serine/threonine phosphatase 4. (7/17751)

The catalytic subunit of protein serine/threonine phosphatase 4 (PP4C) has greater than 65% amino acid identity to the catalytic subunit of protein phosphatase 2A (PP2AC). Despite this high homology, PP4 does not appear to associate with known PP2A regulatory subunits. As a first step toward characterization of PP4 holoenzymes and identification of putative PP4 regulatory subunits, PP4 was purified from bovine testis soluble extracts. PP4 existed in two complexes of approximately 270-300 and 400-450 kDa as determined by gel filtration chromatography. The smaller PP4 complex was purified by sequential phenyl-Sepharose, Source 15Q, DEAE2, and Superdex 200 gel filtration chromatographies. The final product contained two major proteins: the PP4 catalytic subunit plus a protein that migrated as a doublet of 120-125 kDa on SDS-polyacrylamide gel electrophoresis. The associated protein, termed PP4R1, and PP4C also bound to microcystin-Sepharose. Mass spectrometry analysis of the purified complex revealed two major peaks, at 35 (PP4C) and 105 kDa (PP4R1). Amino acid sequence information of several peptides derived from the 105 kDa protein was utilized to isolate a human cDNA clone. Analysis of the predicted amino acid sequence revealed 13 nonidentical repeats similar to repeats found in the A subunit of PP2A (PP2AA). The PP4R1 cDNA clone engineered with an N-terminal Myc tag was expressed in COS M6 cells and PP4C co-immunoprecipitated with Myc-tagged PP4R1. These data indicate that one form of PP4 is similar to the core complex of PP2A in that it consists of a catalytic subunit and a "PP2AA-like" structural subunit.  (+info)

Identification of 17-methyl-18-norandrosta-5,13(17-dien-3beta-ol, the C19 fragment formed by adrenal side chain cleavage of a 20-aryl analog of (20S)-20-hydroxycholesterol. (8/17751)

Incubation of (20R)-20-phenyl-5-pregnene-3beta,20-diol, an aromatic analog of (23S)-20-hydroxycholesterol, with an adrenal mitochondrial preparation leads to the formation of four compounds: pregnenolone, phenol, a C8 ketone, acetophenone, and a nonpolar C19 compound. This latter compound has now been identified by reverse isotope dilution analysis and by gas chromatography/mass spectrometry as 17-methyl-18-norandrosta-5,13(17)-dien-3beta-ol. From these results it is evident that enzymatic fission of the C-17,20 bond of this synthetic derivative occurs. On the other hand, when (20S)-20-hydroxy[21-14C]cholesterol was used as substrate, the analogous cleavage did not take place. Thus, substitution of an aromatic group on C-20 facilitates side chain cleavage between that carbon atom and the nucleus whereas neither of the naturally occuring precursors, cholesterol or its 20-hydroxylated counterpart, are metabolized to a C8 fragment.  (+info)

We Have Recent Updates of Liquid Chromatography-Mass Spectroscopy Market in Sample [email protected] This report is an in-depth analysis of the Liquid Chromatography-Mass Spectroscopy market categorized based on the end user, derivatives,and geographical regions such as America, APAC, Europe, and MEA.Competitorsin the Liquid Chromatography-Mass Spectroscopy market are studied in detail in the report. It offers key details of the vendors in the Liquid Chromatography-Mass Spectroscopy market. To help enterprises, investors, and other market players improve their position in the Liquid Chromatography-Mass Spectroscopy market, this Liquid Chromatography-Mass Spectroscopy market report provides a detailed analysis of the market leaders. Moreover, it gives a brief overview of the competencies and ability of these companies in the Liquid Chromatography-Mass Spectroscopy to grow in future and dominate the market. The ...
TY - JOUR. T1 - Feasibility of membrane inlet mass spectrometry for on-site screening of volatile monoterpenes and monoterpene alcohols in forest soil atmosphere. AU - Ketola, Raimo A.. AU - Kiuru, Jari. AU - Kotiaho, Tapio. AU - Kitunen, Veikko. AU - Smolander, Aino. PY - 2011. Y1 - 2011. N2 - Volatile monoterpenes and monoterpene alcohols exist in the forest soil atmosphere and they may play an important role in controlling microbial processes related to C and N cycling in boreal forest soils. Therefore, information is needed about their actual concentrations in the soil atmosphere. Here, we developed and applied membrane inlet mass spectrometry (MIMS) with a simple sampling probe for an on-site determination of the most common monoterpenes and monoterpene alcohols in the forest soil atmosphere. The MIMS method was also compared with a chamber method for collection samples into sorbent tubes and an off-line static headspace GC-FID analysis. The sampling principles of the methods are different: ...
TY - JOUR. T1 - Temperature Programmed Desorption for Membrane Inlet Mass Spectrometry. AU - Ketola, Raimo. AU - Grøn, Christian. AU - Lauritsen, Frants Roager PY - 1998. Y1 - 1998. U2 - 10.1002/(SICI)1097-0231(19980630)12:12,773::AID-RCM231,3.0.CO;2-D. DO - 10.1002/(SICI)1097-0231(19980630)12:12,773::AID-RCM231,3.0.CO;2-D. M3 - Journal article. VL - 12. SP - 773. EP - 778. JO - Rapid Communications in Mass Spectrometry. JF - Rapid Communications in Mass Spectrometry. SN - 0951-4198. ER - ...
Article Membrane inlet mass spectrometry method (REOX/MIMS) to measure 15N-nitrate in isotope-enrichment experiments. Using15N stable isotope as a tracer to ...
Persistence Market Research has studied the overall performance of the global liquid chromatography-mass spectroscopy market and have observed that the market is likely to show significant growth owing to a rising demand for liquid chromatography-mass spectroscopy systems across various applications.
The standard atomic weight (or atomic weight) scale has traditionally been a relative value, that is without a unit, with the first relative atomic mass basis suggested by John Dalton in 1803 as 1H.[8] Despite the initial mass of 1H being used as the natural unit for relative atomic mass, it was suggested by Wilhelm Ostwald that relative atomic mass would be best expressed in terms of units of 1/16 mass of oxygen (1903). This evaluation was made prior to the discovery of the existence of elemental isotopes, which occurred in 1912.[8]. The discovery of isotopic oxygen in 1929 led to a divergence in relative atomic mass representation, with isotopically weighted oxygen (i.e., naturally occurring oxygen relative atomic mass) given a value of exactly 16 atomic mass units (amu) in chemistry, while pure 16O (oxygen-16) was given the mass value of exactly 16 amu in physics. The divergence of these values could result in errors in computations, and was unwieldy. The chemistry amu, based on the relative ...
HR Institute of Forensic Science Research & Training (REGD.) - Service Provider of Training On Mass Spectrometry based in Delhi, India
TY - JOUR. T1 - Determination of active hydrogen in organic compounds by electron‐impact mass spectrometry. AU - Dinya, Z.. AU - Lipták, Miklós. AU - Szabó, Pál. AU - Sztaricskai, F.. AU - Vékey, K.. PY - 1992. Y1 - 1992. N2 - We report here detailed studies of Bose et al.s (J. Org. Chem. 47, 4008 (1982)) simple method for obtaining electron‐impact (EI) mass spectra from non‐volatile and/or thermolabile organic compounds by using ammonium salts. Good quality mass spectra can be obtained by mixing the analyte with different ammonium salts (mainly with NH4Cl) in a given ratio, the mixture being introduced through a conventonal direct probe. A wide variety of ammonium salts has been used to study the effect of the anion and to determine the optimum analyte:NH4X ratio and the other experimental parameters (i.e., electron energy, source temperature etc). A very simple and cheap means of determination of active hydrogen in hydroxyl, carboxyl, sulfhydryl, amino and amido etc groups by EI ...
TY - JOUR. T1 - Ovarian Cancer Identification Based on Dimensionality Reduction for High-Throughput Mass Spectrometry Data. AU - Yu, JS. AU - Ongarello, S. AU - Fiedler, R. AU - Chen, RW. AU - Toffolo, G. AU - Trajanoski, Zlatko. AU - Cobelli, C. N1 - PMID:1578749. PY - 2005. Y1 - 2005. M3 - Article. SP - 2200. EP - 2209. JO - Bioinformatics. JF - Bioinformatics. SN - 1367-4803. ER - ...
A comprehensive Collision Cross Section (CCS) library was obtained via Travelling Wave Ion Guide mobility measurements through direct infusion (DI). The library consists of CCS and Mass Spectral (MS) data in negative and positive ElectroSpray Ionisation (ESI) mode for 463 and 479 endogenous metabolites, respectively. For both ionisation modes combined, TWCCSN2 data were obtained for 542 non-redundant metabolites. These data were acquired on two different ion mobility enabled orthogonal acceleration QToF MS systems in two different laboratories, with the majority of the resulting TWCCSN2 values (from detected compounds) found to be within 1% of one another. Validation of these results against two independent, external TWCCSN2 data sources and predicted TWCCSN2 values indicated to be within 1-2% of these other values. The same metabolites were then analysed using a rapid reversed-phase ultra (high) performance liquid chromatographic (U(H)PLC) separation combined with IM and MS (IM-MS) thus ...
Glycans are compounds that consist of a large number of monosaccharides. Glycans can be homopolymers or heteropolymers of monosaccharide residues and can either be linear or branched. Glycans are found on the exterior surface of cells and can be found attached to proteins as in glycoproteins and proteoglycans. In glycan analysis which seeks to explore the structure and functions of various glycans, high-resolution mass spectrometry (MS) and high-performance liquid chromatography (HPLC) are commonly used.. Mass spectrometry (MS) offers high sensitivity and addresses the most frequent biological issues hence it is a valuable tool for the structural characterization of carbohydrates. Oligosaccharide structures can be explained through mass spectrometry and chromatographic separation derivatization. Some of the techniques used for mass spectrometry are Gas Chromatography coupled to Mass Spectrometry (GC/MS), Liquid Chromatography with Mass Spectrometry (LC/MS), Ion mobility-mass spectrometry (IM-MS) ...
View detailed Table of Content here - The increasing spending on pharmaceutical R&D across the globe, government regulations on drug safety, growing focus on the quality of food products, and technological advancements in mass spectrometers are the key drivers of the mass spectrometry market. Government initiatives for pollution control and environmental testing and an increase in crude and shale gas production are also supporting the growth of this market.. Hybrid mass spectrometers are estimated to account for the largest share of the mass spectrometry platform market in 2019. The mass spectrometry market is segmented on the platform into hybrid mass spectrometry, single mass spectrometry, and other platforms. The hybrid mass spectrometry segment is further divided into triple quadrupole, quadrupole TOF, and Fourier transform mass spectrometry devices, while the single mass spectrometry segment includes single ...
Both El MS and FAB MS behavior of two groups of compounds, aryltin and ferrocene compounds, have been studied. For the aryltin compounds, the effect of substituent group position, substituent group type and ligand type on the El spectra have been explored in the El MS studies. The fragmentation mechanism has been investigated under El with linked scans, such as fragment ion scans(BJE), parent ion scans(B2JE) and constant neutral radical loss scans(B2(1-E)JE2). In the FAB MS studies, matrix optimization experiments have been carried out. The positive ion FAB MS studies focused on the effect of substituent group position, substituent group type and ligand type on the spectra. The fragmentation mechanisms of all the samples under positive ion FAB have been studied by means of the linked scans. The CA positive ion FAB fragmentation studies were also carried out for a typical sample. Negative ion FAB experiments of all the compounds have been done. And finally, the comparison of the El MS and FAB MS ...
In physics and chemistry, the atomic mass constant, mu, is one twelfth of the mass of an unbound atom of carbon-12 at rest and in its ground state. It serves to define the atomic mass unit and is, by definition, equal to 1 u. The CODATA recommended value is 6973166053904000000♠1.660539040(20)×10−27 kg. In practice, the atomic mass constant is determined as the ratio of the electron rest mass me to the electron relative atomic mass Ar(e) (that is, the mass of the electron on a scale where 12C = 12). The relative atomic mass of the electron can be measured in cyclotron experiments, while the rest mass of the electron can be derived from other physical constants. m u = m e A r ( e ) = 2 R ∞ h A r ( e ) c α 2 {\displaystyle m_{\rm {u}}={\frac {m_{\rm {e}}}{A_{\rm {r}}({\rm {e}})}}={\frac {2R_{\infty }h}{A_{\rm {r}}({\rm {e}})c\alpha ^{2}}}} The current uncertainty in the value of the atomic mass constant - one part in 20 million - is almost entirely due to the uncertainty in the value of the ...
The Year of Education is a joint initiative between separationsNOW and Chromedia. Read more about Chromedia and subscribe Free, Live and Interactive Educational Webinar Sports Drug Testing Chromatography and Mass Spectrometry-Based Approaches This webinar has been broadcast and is now available on demand. Professor Mario Thevis discusses the...
The Year of Education is a joint initiative between separationsNOW and Chromedia. Read more about Chromedia and subscribe Free, Live and Interactive Educational Webinar Sports Drug Testing Chromatography and Mass Spectrometry-Based Approaches This webinar has been broadcast and is now available on demand. Professor Mario Thevis discusses the...
Article Identification of compounds in water by high resolution mass spectrometry. A chemical manufacturer for the rubber and plastics industries used over 100 chemicals for syntheses. For at least 30 years, some fractions of these chemicals, synthes...
Biotech Support Group to exhibit at the 67th ASMS Conference on Mass Spectrometry & Allied Topics. Biotech Support Group will exhibit at the annual ASMS Conference, June 2-6, 2019 in Atlanta, GA. The American Society for Mass Spectrometry (ASMS) was formed in 1969 to promote and disseminate knowledge of mass spectrometry and allied topics. - PR12768157
The article evaluated the degradation of the captopril in aqueous solution after ozonation and chlorination. The process was continuously monitored focusing on the identification, mass spectrometry and elucidation of its by-products by applying direct infusion and high performance liquid chromatography, electrospray ionization high resolution mass spectrometry, in the negative ion mode. The cytotoxicity of its by-products solutions were evaluated with 3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide (MTT) assay. It was observed through that after 30 min of ozonation and chlorination, there was complete oxidation of captopril, i.e., 100% removal efficiency. At these conditions, the rate of mineralization, by total organic carbon, was only 7.63% for ozonation and 6.40% for chlorination, evidencing the formation of degradation by-products. Ten captopril by-products were identified and their respective chemical structures elucidations are proposed. The treated samples and their by-products
This volume explores state-of-the-art mass spectrometric techniques. It focuses on liquid chromatography/mass spectrometry/mass spectrometry and time-of-flight/mass spectrometry to determine emerging contaminants, such as pharmaceuticals, hormones, pesticides, surfactants and unknown natural products.
Collision cross sections obtained with ion mobility mass spectrometry as new descriptor to predict blood-brain barrier permeation by drugs ...
ePIC (electronic Publication Information Center) is the official repository for publications and presentations of Alfred Wegener Institute for Polar and Marine Research (AWI)
Touch spray mass spectrometry using medical swabs is an ambient ionization technique (ionization of unprocessed sample in the open air) that has potential intraoperative application in quickly ide ...
ISMAS organizes Workshops on Mass Spectrometry at Research Institutes and Universities in different parts of India. These Workshops are aimed at introducing the subject of Mass Spectrometry to novices, updating the Mass Spectrometrists with the latest developments in the field, exposing the participants to innumerable applications of Mass Spectrometry and providing a common forum for discussing the day-to-day problems when working with a Mass Spectrometer. The programme of these Workshops consists of Tutorials, Panel Discussions, Research Scholar Presentations, Poster Presentations and Invited Lectures. The lectures include fundamentals of Mass Spectrometry, qualitative and quantitative aspects and data interpretation, maintenance of Mass Spectrometers, selection of a mass spectrometer, applications in various branches of science as well as recent advances in Mass Spectrometry. The lectures are supplemented by (i) Open-forum discussions on the experiences gained by the Resource Persons (faculty) ...
The Journal of the American Society for Mass Spectrometry presents research papers covering all aspects of mass spectrometry, incorporating coverage of fields of scientific inquiry in which mass spectrometry can play a role.. Comprehensive in scope, the journal publishes papers on both fundamentals and applications of mass spectrometry. Fundamental subjects include instrumentation principles, design, and demonstration, structures and chemical properties of gas-phase ions, studies of thermodynamic properties, ion spectroscopy, chemical kinetics, mechanisms of ionization, theories of ion fragmentation, cluster ions, and potential energy surfaces. In addition to full papers, the journal offers Communications, Application Notes, and Accounts and Perspectives. All papers should describe new mass spectrometry science. Reports of applications that utilize standard mass spectrometry approaches should be sent to application journals.. 2015 Impact Factor: 3.031. ...
Buy Applications in High Resolution Mass Spectrometry from Dymocks online BookStore. Find latest reader reviews and much more at Dymocks
Browse more than 73 market data tables with 17 figures spread through 199 pages and in-depth TOC on Mass Spectrometry Market.. Early buyers will receive 10% customization on this report.. This report covers the definition, description, and forecast of the mass spectrometry market in terms of technologies and applications. Based on technologies, the mass spectrometry market comprises Tandem LC/MS, LC/MS-Time of Flight, MALDI-TOF, Single Quadrupole, Fourier Transform MS, Gas Chromatography/MS, and others. The applications market is categorized into pharmaceuticals, biotechnology, industrial chemistry, environmental testing, food and beverage testing, and others.. Over the years, the demand for mass spectrometry has increased significantly owing to the increasing use of mass spectrometry technologies to address the growing concerns in food safety and the increasing number of government funds and spending on ...
Our patented, chip-based miniaturised mass spectrometry technology enables analytical detection at the point-of-need in laboratories or bioprocessing facilities
Pyrolysis and mass spectrometry studies of meteoritic organic matter Mass Spectrometry Reviews , 2012, 31 , 560-569 M.A. Sephton Abstract Meteorites are fragments of extraterrestrial materials that fall to the Earths surface. The carbon-rich meteorites are derived from ancient asteroids that have remained relatively unprocessed since the...
A large proportion of polar anthropogenic compounds routinely released into the environment comprises homologue series, i.e., sets of chemicals differing in a repeating chemical unit. Using analytical techniques such as liquid chromatography coupled to high-resolution mass spectrometry (LC-HRMS), these compounds are readily measurable as signal sets with characteristic differences in mass and typically retention time. However, and despite such distinct characteristics, no computational approach for the direct, simultaneous and untargeted detection of all such signal sets comprising both LC and HRMS information has to date been presented. A fast two-staged approach has been developed to extract LC-HRMS signal patterns which can be indicative of homologous analytes. In a first stage, a k-d tree representation of picked LC-HRMS peaks is used to extract all feasible 3-tuples of peaks with restrictions in, e.g., mass defect differences. A second stage then recombines these 3-tuples to larger series tuples
The combination of stable isotope labelling with direct infusion ion mobility mass spectrometry (IM-MS) enabled qualitative and quantitative monitoring of biocatalytic reactions with reduced analysis times, enhanced sensitivity and μL-level assay volumes. The new approach was demonstrated by applying to both lipase and monooxygenase enzymes, including multi-substrate screening ...
TY - JOUR. T1 - Monitoring organic compounds in aqueous solution by rotating ball inlet mass spectrometry with continuous wave infrared laser desorption. AU - Schmidt, E.N.. AU - Ørsnes, H.. AU - Graf, T.. AU - Christensen, T.. AU - Degn, H.. PY - 2001. Y1 - 2001. U2 - 10.1016/S0925-4005(01)00649-9. DO - 10.1016/S0925-4005(01)00649-9. M3 - Journal article. VL - 76. SP - 411. EP - 418. JO - Sensors and Actuators B: Chemical. JF - Sensors and Actuators B: Chemical. SN - 0925-4005. ER - ...
Manufacturer of Liquid Chromatography Mass Spectrometry - LCMS QQQ 6460 Mass Spectrometer, CAH Mass Solution offered by Trivitron Healthcare Pvt. Ltd., Chennai, Tamil Nadu.
Laser isotope mass spectrometry is the next-generation technology for measuring environmental isotopes, and the Groundwater Education Investment Fund (GEIF) has invested in a suite of instruments to enable state-of-art research capabilities for groundwater research in Australia.. The ability to measure oxygen and hydrogen isotopes in liquid water and water vapour is of great value in both field and laboratory settings.. In the field, water vapour analyses help quantify the water budget as they can constrain water loss incurred due to evapotranspiration from vegetation. In the laboratory, the ancient pore water can be measured in aquitard material and can characterise water movement in aquitards through the vapour equilibrium technique.. Laser isotope mass spectrometry can also be used for isotope analysis of the carbon contained in dissolved organic and inorganic carbon and gaseous methane.. One of the main benefits of a method for the routine measurement of liquid water samples by isotope mass ...
Learn about Agilent׷ liquid chromatography/mass spectrometry (LC/MS). Agilent LC/MS enables a wide array of applications by combining sample preparation, liquid chromatography (LC), mass spectrometry (MS), and dedicated software tools like compound databases and libraries.
Background In recent years, several mass spectrometry-based omics technologies emerged to investigate qualitative and quantitative changes within thousands of biologically active components such as proteins, lipids and metabolites. The research enabled through these methods potentially contributes to the diagnosis and pathophysiology of human diseases as well as to the clarification of structures and interactions between biomolecules. Simultaneously, technological advances in the field of mass spectrometry leading to an ever increasing amount of data, demand high standards in efficiency, accuracy and reproducibility of potential analysis software. Results This article presents the current state and ongoing developments in OpenMS, a versatile open-source framework aimed at enabling reproducible analyses of high-throughput mass spectrometry data. It provides implementations of frequently occurring processing operations on MS data through a clean application programming interface in C++ and Python. ...
Been many years since I took general and org chem and am currently reading general chem textbook as refresher. Came across defintion of amu (atomic mass unit). Text says that the mass of the carbon-12 atom is defined to be exactly 12 amu. However, a couple of pages over, I read that the mass of the proton is about 1.007 amu, and the mass of the neutron is about 1.009 amu. Add up the masses of 6 protons and 6 neutrons for the carbon-12 atom, and you come up with more than 12 amu. I cant resolve this apparent discrepancy. Ive consulted other texts, etc. Does some type of relativistic effect bear on this situation? In other words, does, for example, an isolated proton have a mass of 1.007 amu, but then when part of an atom have a slightly different mass because of some relativistic effect? HELP ...
Characterisation of stereoisomeric α-methylene-γ-lactone furanosidic derivatives by direct chemical ionisation mass spectrometry and liquid secondary ion mass sepctrometry with tandem mass spectrometry ...
Abstract : Butylatedhydroxytoluene (BHT) and 4-methoxyphenol (4-MP) are phenol derivatives that are generally knownfor their antioxidant properties and depigmenting activities. The aim of this study was to evaluate the impact ofbiofield energy treatment on the isotopic abundance in BHT and 4-MP using gas chromatography-mass spectrometry(GC-MS). BHT and 4-MP samples were divided into two parts: control and treated. The control group remaineduntreated while the treated group was subjected to Mr. Trivedis biofield treatment. Control and treated sampleswere characterized using GC-MS. The GC-MS data revealed that the isotopic abundance ratio of 13C/12C or 2H/1H(PM+1)/PM and 18O/16O (PM+2)/PM increased significantly in treated BHT and 4-MP (where PM- primary molecule,PM+1- isotopic molecule either for 13C or 2H and PM+2 is the isotopic molecule for 18O). The isotopic abundance ratioof (PM+1)/PM in the treated BHT and 4-MP was increased up to 181.27% and 380.73% respectively as comparedto their ...
The characterization of protein stability changes and protein-ligand interactions on the proteomic scale is important for understanding the biology of cellular processes. The identification and quantification of protein-ligand binding affinities is critical for disease state analyses and drug discovery. A mass spectrometry-based technique, Stability of Proteins from Rates of Oxidation (SPROX), has been established for the thermodynamic analysis of protein stability and protein-ligand interactions. In the first part of this dissertation, a previously published iTRAQ-SPROX protocol is improved by incorporating a filter assisted sample preparation (FASP) protocol to significantly reduce sample loss during the experiment. Also, in order to eliminate methionine as a potential contaminant that can cause signal suppression during LC-MS/MS analysis, TCEP•HCl is used to quench the H2O2 oxidation instead of methionine. This avoids the potential reaction between the free methionine and the iTRAQ ...
Given the wide diversity in applications of biological mass spectrometry, custom data analyses are often needed to fully interpret the results of an experiment. Such bioinformatics scripts necessarily include similar basic functionality to read mass spectral data from standard file formats, process it, and visualize it. Rather than having to reimplement this functionality, to facilitate this task, spectrum_utils is a Python package for mass spectrometry data processing and visualization. Its high-level functionality enables developers to quickly prototype ideas for computational mass spectrometry projects in only a few lines of code. Notably, the data processing functionality is highly optimized for computational efficiency to be able to deal with the large volumes of data that are generated during mass spectrometry experiments. The visualization functionality makes it possible to easily produce publication-quality figures as well as interactive spectrum plots for inclusion on web pages. spectrum_utils adds Mass Spectrometry Market - by Technology (Tandem LC - MS/ Quadrupole/ ICP - MS/ Gas Chromatography - MS/ TOF - MS/ MALDI -TOF/ Fourier Transform - MS) & by Application (Pharmaceutical/ Biotechnology/ Environment/ Food & Beverages) - Global Trends & Forecast to 2018 report to its research database.. Over the years, the mass spectrometry market-comprising of instruments, consumables, and services-has witnessed various technological advancements. These advancements have led to a growth in the number of mass spectrometry applications. Some of the applications using mass spectrometry are drug discovery and development, metabolomics, biomarkers, and diagnostics. However, the high cost of instruments and the need for skilled professionals to operate these highly sophisticated systems are factors that are hindering the market.. The MALDI-TOF segment is one of the fastest-growing segments in the mass spectrometry market, since MALDI-based technologies are expected to find ...
The mass spectrometry platform of the CPF is the cancer-focused component of the Biomedical Mass Spectrometry (BioMS) Center, a University of Pittsburgh-wide shared resource located in the Biomedical Science Tower 3 on the Oakland campus. This facility was designed and renovated as a dedicated, state-of-the-art mass spectrometry center, to advance the use and application of mass spectrometry in basic and/or translational research at all levels, from first-time users to experts in the field. The CPF/BioMS Center currently includes twelve modern mass spectrometers that support a wide range of analytical capabilities.. Learn more about the mass spectrometry resources and equipment available to Hillman investigators through the CPF/BioMS Center.. ...
Abstract : 2-Aminopyridine (2-AP) and 2,6-diaminopyridine (2,6-DAP) are two derivatives of aminopyridines that act as animportant organic intermediates, mostly used in medicines, dyes and organic sensors. The aim of the study was to evaluate theimpact of biofield energy treatment on isotopic abundance ratios of 2H/1H, 13C/12C, or 15N/14N, in aminopyridine derivativesusing gas chromatography-mass spectrometry (GC-MS). The 2-AP and 2,6-DAP samples were divided into two parts: controland treated. The control sample remained as untreated, while the treated sample was further divided into four groups as T1, T2,T3, and T4. The treated group was subjected to Mr. Trivedis biofield energy treatment. The GC-MS spectra of 2-AP and 2,6-DAP showed five and six m/z peaks respectively due to the molecular ion peak and fragmented peaks of aminopyridinederivatives. The isotopic abundance ratio of 2H/1H, 13C/12C, or 15N/14N were calculated for both the derivatives and significantalteration was found in the ...
one_half]. Mass spectrometry is an analytical technique vastly used in chemistry, biotechnology, food and safety monitoring, pharmaceutics, genomics, proteomics, and many others. Its academic and economic importance in the UK is thoroughly documented by the British Mass Spectrometry Society ( The global market amounts to £ 2.5 billion per year. Small mass spectrometers are available, however all in the low range of mass resolution ∆m/m∈10-3-10-4. The mass resolution of the Geonium Chip is given by the cyclotron resonance ∆ωp/ωp, which we aim at 10-7 or above, thus orders of magnitude better than other small mass spectrometers.. The Geonium Chip technology will deliver a cutting-edge mass spectrometry technology at a much lower cost and size than conventional high-end FT-ICR mass spectrometers, which require a superconducting solenoid. The key factor is the achievement of a homogeneous magnetic field at the position of the trapped ions. This can be done with a local ...
Detail záznamu - Tandem mass spectrometry identification and LC-MS quantification of intact cytokinin nucleotides in K-562 human leukemia cells - Detail záznamu - Knihovna Akademie věd České republiky
Wenchao Zhang, Junil Chang, Zhentian Lei, David Huhman, Lloyd W. Sumner, and Patrick X. Zhao. Plant Biology Division, The Samuel Roberts Noble Foundation, 2510 Sam Noble Parkway, Ardmore, OK 73401, USA. Accurate and automated metabolite-associated chromatograph peak feature extraction, annotation, alignment, and quantification are critical yet challenging analysis steps in large-scale liquid chromatography/mass spectrometry (LC/MS)-based untargeted metabolomics and metabolite identification.. We developed a novel LC/MS data processing and analysis platform, MET-COFEA (METabolite COmpound Feature Extraction and Annotation). MET-COFEA detects and clusters chromatograph peak features for each metabolite compound by first comprehensively evaluating retention time and peak shape criteria and then annotating the associations between each peaks observed m/z value with the corresponding metabolite compounds molecular mass. MET-COFEA integrates a series of innovative approaches, including novel mass ...
Mass spectrometry is a multidisciplinary field that has emerged as an indispensable analytical method due to its high sensitivity, universality and specificity. The technique plays vital role in several scientific areas such as chemistry, physics, nuclear technology, biology, material science, forensic science, archaeology, etc. The list of applications continues to grow day by day. In order to promote the activities of Mass spectrometry in India, ISMAS was formed in 1978 during a meeting of mass spectrometrists at Bhabha Atomic Research Centre. The Life-members include mass spectrometrists from research institutes, universities and industry from India as well as abroad. For nearly last four decades, ISMAS has been playing a key role in popularizing mass spectrometry in India by organizing international/national symposia, workshops, theme based meetings on mass spectrometry, recognizing achievements in mass spectrometry through ISMAS awards program etc. A recent addition to the activities of ...
TY - JOUR. T1 - A membrane inlet mass spectrometry system for noble gases at natural abundances in gas and water samples. AU - Visser, Ate. AU - Singleton, Michael J.. AU - Hillegonds, Darren J.. AU - Velsko, Carol A.. AU - Moran, Jean E.. AU - Esser, Bradley K.. PY - 2013/11/15. Y1 - 2013/11/15. N2 - Rationale Noble gases dissolved in groundwater can reveal paleotemperatures, recharge conditions, and precise travel times. The collection and analysis of noble gas samples are cumbersome, involving noble gas purification, cryogenic separation and static mass spectrometry. A quicker and more efficient sample analysis method is required for introduced tracer studies and laboratory experiments. Methods A Noble Gas Membrane Inlet Mass Spectrometry (NG-MIMS) system was developed to measure noble gases at natural abundances in gas and water samples. The NG-MIMS system consists of a membrane inlet, a dry-ice water trap, a carbon-dioxide trap, two getters, a gate valve, a turbomolecular pump and a ...
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TY - JOUR. T1 - Chemical reactions in fast atom bombardment mass spectrometry. AU - Vékey, K.. AU - Zerilli, Luigi F.. PY - 1991. Y1 - 1991. N2 - Examples of various chemical reactions occurring in the matrix or in the selvedge region in fast atom bombardment (FAB) mass spectrometry are discussed. These are categorized as oxidations and reductions; substitutions; clusterings and additions; and sample decomposition or transformation. Some reactions observed showed significant time behaviour and in one case it was possible to determine rate constants. These data suggest that chemical reactions can be accelerated significantly by fast atom bombardment.. AB - Examples of various chemical reactions occurring in the matrix or in the selvedge region in fast atom bombardment (FAB) mass spectrometry are discussed. These are categorized as oxidations and reductions; substitutions; clusterings and additions; and sample decomposition or transformation. Some reactions observed showed significant time ...
TY - JOUR. T1 - Detection of Adriamycin-DNA adducts by accelerator mass spectrometry at clinically relevant Adriamycin concentrations. AU - Coldwell, Kate E.. AU - Cutts, Suzanne M.. AU - Ognibene, Ted J.. AU - Henderson, Paul. AU - Phillips, Don R.. PY - 2008. Y1 - 2008. N2 - Limited sensitivity of existing assays has prevented investigation of whether Adriamycin-DNA adducts are involved in the anti-tumour potential of Adriamycin. Previous detection has achieved a sensitivity of a few Adriamycin-DNA adducts/104 bp DNA, but has required the use of supra-clinical drug concentrations. This work sought to measure Adriamycin-DNA adducts at sub-micromolar doses using accelerator mass spectrometry (AMS), a technique with origins in geochemistry for radiocarbon dating. We have used conditions previously validated (by less sensitive decay counting) to extract [14C]Adriamycin-DNA adducts from cells and adapted the methodology to AMS detection. Here we show the first direct evidence of Adriamycin-DNA ...
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TY - JOUR. T1 - Capillary electrophoresis-mass spectrometry for the analysis of amino acids. AU - Iavarone, Federica. AU - Desiderio, Claudia. AU - Rossetti, Diana Valeria. AU - Messana, Irene. AU - Castagnola, Massimo. PY - 2010. Y1 - 2010. N2 - In this review, the recent contribution of CE-MS technology to the analysis of amino acids, as well as the advantages of the hyphenation and the technologies involved in the instrumental coupling are reported. Different sections are dedicated to the recent contributions of CE-MS to the analysis of protein amino acids and their post-translational modifications, such as phosphorylation and sulfation. CE-MS analysis of some amino acid derivatives, such as the free methylated-derivatives of arginine is also discussed. A section is specifically devoted to the CE-MS applications in the field of chiral separation of D-and L-amino acid enantiomers.. AB - In this review, the recent contribution of CE-MS technology to the analysis of amino acids, as well as the ...
TY - JOUR. T1 - Peptide identifications and false discovery rates using different mass spectrometry platforms. AU - Anapindi, Krishna D.B.. AU - Romanova, Elena V.. AU - Southey, Bruce R.. AU - Sweedler, Jonathan V.. N1 - Funding Information: The project described was supported by Award no. P30 DA018310 from the National Institute on Drug Abuse , Award no. R01 NS031609 from the National Institute of Neurological Disorders and Stroke , and Award no. CHE-16-06791 from the National Science Foundation . The content is solely the responsibility of the authors and does not necessarily represent the official views of the funding agencies. Appendix A PY - 2018/5/15. Y1 - 2018/5/15. N2 - Characterization of endogenous neuropeptides produced from post-translational proteolytic processing of precursor proteins is a demanding task. A variety of complex prohormone processing steps generate molecular diversity from neuropeptide prohormones, making in silico neuropeptide discovery difficult. In addition, the ...
Capillary electrophoresis-mass spectrometry (CE-MS) is a hyphenated technique that combines the advantages like low sample consumption, high separation efficiency, short analytical time in CE and high sensitivity, powerful molecular structure elucidation in MS. Polyimide-coated fused silica capillary has become the most dominant capillary for CE, but it suffers from swelling and aminolysis of polyimide coating when treated with organic solvents and alkaline buffer in the CE-MS interface in which
Mass spectroscopy is increasingly used for measuring the presence and amounts of substances in samples, with applications in food, security, health and safety industries and is considered an excellent measurement tool. One of the methods used to identify multiple compounds in a sample is isotope dilution. However, this method does not account for the sample changes during the analysis and composition changes must be determined mathematically or by conducting multiple experiments. Due to this complexity, uptake of this advanced calibration approach is slow. Current algorithms to address simultaneous compound formation and degradation using multiple spiking isotope dilution mass spectrometry are extremely complex and do not result in explicit results nor reliable estimates of uncertainty in those results. Many algorithms give identical numerical results for the initial amount of substances in the sample, but the coefficients that describe the changes during the analysis differ.. There is a demand ...
TY - JOUR. T1 - A liquid chromatography with tandem mass spectrometry-based proteomic analysis of cells cultured in DMEM 10% FBS and chemically defined medium using human adipose-derived mesenchymal stem cells. AU - Nakashima, Yoshiki. AU - Nahar, Saifun. AU - Miyagi-Shiohira, Chika. AU - Kinjo, Takao. AU - Kobayashi, Naoya. AU - Saitoh, Issei. AU - Watanabe, Masami. AU - Fujita, Jiro. AU - Noguchi, Hirofumi. PY - 2018/7/13. Y1 - 2018/7/13. N2 - Human adipose-derived mesenchymal stem cells (hADSCs) are representative cell sources for cell therapy. Classically, Dulbeccos Modified Eagles medium (DMEM) containing 10% fetal bovine serum (FBS) has been used as culture medium for hADSCs. A chemically defined medium (CDM) containing no heterologous animal components has recently been used to produce therapeutic hADSCs. However, how the culture environment using a medium without FBS affects the protein expression of hADSC is unclear. We subjected hADSCs cultured in CDM and DMEM (10% FBS) to a protein ...
Abstract :The extraction, separation and purification of flavonoids from Aurea Helianthus were performed using various organic solvents and gradient elution methods. Ultraviolet spectrophotometry and high performance liquid chromatography-mass spectrometry were used to analyze flavonoids. Results:UV-Vis spectrophotometer UV 2450 (SHIMADZU) was used to preliminarily identify the content of flavonoids in the extracts of Aurea Helianthus3 flavonoid content in the ethyl acetate extract was the highest ,48.3±0.3%.There was a good linear relationship between 0.004 and 0.024 mg/ml (R2 = 0.998).Ethyl acetate extract was used as the test object for high performance liquid chromatography-mass spectrometry analysis.In the linear range 10.0-240μg,good precision and reproducibility, stable within 6 hours.The average recoveries of quercetin,Hyperoside, and rutin were 105.32%, 102.25%, and 103.14%.The content of rutin in the gradient elution (EtOAc:MeOH=4:1) was 42.8±0.3%, and the content of hyperin and ...
TY - GEN. T1 - APPLICATIONS OF LASER DESORPTION MASS SPECTROMETRY.. AU - Cotter, Robert J.. AU - Tabet, Jean Claude. AU - van Breemen, Richard. PY - 1984. Y1 - 1984. N2 - The laser desorption technique can be used for the mass spectral analysis of nonvolatile/thermally labile compounds such as peptides, oligosaccharides, glycolipids, etc. In our laboratory a laser desorption time-of-flight mass spectrometer has been used for structural confirmation of several glucuronic acid conjugates, synthesized by an immobilized-enzyme mediated technique. Laser desorption spectra of several small peptides produce both C-terminal and N-terminal fragments. The molecular ions are formed by cationization (alkali ion attachment) and the alakali ion is generally found on the C-terminal fragments, suggesting a ionization/fragmentation scheme similar to that observed by chemical ionization.. AB - The laser desorption technique can be used for the mass spectral analysis of nonvolatile/thermally labile compounds such ...
Hemoglobin (Hb) is a tetrameric noncovalent complex consisting of two alpha- and two beta-globin chains each associated with a heme group. Its exact assembly pathway is a matter of debate. Disorders of hemoglobin are the most common inherited disorders and subsequently the molecule has been extensively studied. This work attempts to further elucidate the structural properties of the hemoglobin tetramer and its components. Gas-phase conformations of hemoglobin tetramers and their constituents were investigated by means of traveling-wave ion mobility mass spectrometry. Sickle (HbS) and normal (HbA) hemoglobin molecules were analyzed to determine whether conformational differences in their quaternary structure could be observed. Rotationally averaged collision cross sections were estimated for tetramer, dimer, apo-, and holo-monomers with reference to a protein standard with known cross sections. Estimates of cross section obtained for the tetramers were compared to values calculated from X-ray ...
Recent advances in phosphopeptide enrichment prior to mass spectrometric analysis show genuine promise for characterization of phosphoproteomes. Tandem mass spectrometry of phosphopeptide ions, using collision-activated dissociation (CAD), often produces product ions dominated by the neutral loss of …
Federal regulations concerning the safety and efficacy of biopharmaceuticals require the implementation of a comprehensive toolbox of physicochemical and biological characterization methods. In order to demonstrate consistent overall structure, even minute differences in primary structure and post‑translational modifications (PTMs) have to be detectable in therapeutic proteins. Because of their remarkable capability of revealing small changes in molecular structure, high performance liquid chromatography (HPLC) and mass spectrometry (MS) rate among the most powerful technologies for comprehensive protein analysis. This article details the potential of both methods with regard to revealing methionine oxidation, a chemical modification that may be induced during downstream processing and storage of biopharmaceuticals. The benefits and limitations of bottom-up, middle-down, and top‑down HPLC-MS analysis will be demonstrated for the detection of oxidation variants in a therapeutic monoclonal antibody
294547663 - EP 0985148 A1 2000-03-15 - NUCLEIC ACID DIAGNOSTICS BASED ON MASS SPECTROMETRY OR MASS SEPARATION AND BASE SPECIFIC CLEAVAGE - [origin: WO9854571A1] A method of detecting a mutation or a difference of one or more nucleotides between a nucleic acid molecule to be tested and a reference nucleic acid molecule, said method comprising subjecting the test nucleic acid molecule to base specific cleavage to generate oligonucleotide fragments, separating the resulting oligonucleotide fragments based on mass by MALDI-ATOF MS and/or other equivalent procedure to produce a fingerprint of then oligonucleotide fragments comprising one or more peaks wherein a peak represents the mass of each fragment and identifying an altered peak relative to a reference nucleic acid molecule subjected to the same procedure wherein the presence of an altered peak is indicative of a difference of one or more nucleotides in said tested nucleic acid molecule.[origin: WO9854571A1] A method of detecting a mutation or a
Liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS) has become one of the most used tools in mass spectrometry based proteomics. Various algorithms have since been developed to automate the process for modern high-throughput LC-MS/MS experiments. A probability based statistical scoring model for assessing peptide and protein matches in tandem MS database search was derived. The statistical scores in the model represent the probability that a peptide match is a random occurrence based on the number or the total abundance of matched product ions in the experimental spectrum. The model also calculates probability based scores to assess protein matches. Thus the protein scores in the model reflect the significance of protein matches and can be used to differentiate true from random protein matches. The model is sensitive to high mass accuracy and implicitly takes mass accuracy into account during scoring. High mass accuracy will not only reduce false positives, but also improves the
Fingerprint Dive into the research topics of Gel permeation chromatography coupled to fourier transform mass spectrometry for polymer characterization. Together they form a unique fingerprint. ...
Separation and identification of individual congeners requires specialized instrumentation, such as a high resolution GC column coupled to a high resolution mass spectrometer. Analyte types include the congeners of dioxins, furans, polychlorinated biphenyls (PCBs), and polybrominated diphenyl ethers (PBDEs). These methods may require a screening procedure using low resolution instrumentation prior to an isotope dilution mass spectrometry analysis performed on high resolution instrumentation. Prior to analysis, samples first undergo an extraction process which partitions analytes into an organic solvent compatible with the instrumentation. Example US EPA methods include 1613, 1614, 1668, 8280, 8290, DLM02.2, and TO-9.
TY - JOUR. T1 - A theoretical and mass spectrometry study of the fragmentation of mycosporine-like amino acids. AU - Cardozo, KHM. AU - Vessecchi, R. AU - Carvalho, VM. AU - Pinto, E. AU - Gates, PJ. AU - Colepicolo, P. AU - Galembeck, SE. AU - Lopes, NP. PY - 2008/6/1. Y1 - 2008/6/1. UR - U2 - 10.1016/j.ijms.2008.02.014. DO - 10.1016/j.ijms.2008.02.014. M3 - Article (Academic Journal). VL - 273. SP - 11. EP - 19. JO - International Journal of Mass Spectrometry. JF - International Journal of Mass Spectrometry. SN - 1387-3806. IS - 1-2. ER - ...
TY - GEN. T1 - Determination of toxaphene in fish samples - a congener specific approach using high resolution mass spectrometry. AU - Cederberg, Tommy Licht. AU - Fromberg, Arvid. AU - Sørensen, Michael Knoth. N1 - Conference code: 17. PY - 1997. Y1 - 1997. M3 - Article in proceedings. SN - 09-64-12931-0. VL - 31. T3 - Organohalogen Compounds. SP - 64. EP - 68. BT - Dioxin 97 : 17th International Symposium on Chlorinated Dioxins and Related Compounds. PB - Bloomington. T2 - 17th International Symposium on Chlorinated Dioxins and Related Compounds. Y2 - 25 August 1997 through 29 August 1997. ER - ...
Imaging mass spectrometry combines the power of mass spectrometry to identify complex molecules based on mass with sample imaging. Recent advances in secondary ion mass spectrometry have improved sensitivity and spatial resolution, so that these methods have the potential to bridge between high-resolution structures obtained by X-ray crystallography and cyro-electron microscopy and ultrastructure visualized by conventional light microscopy. Following background information on the method and instrumentation, we address the key issue of sample preparation. Because mass spectrometry is performed in high vacuum, it is essential to preserve the lateral organization of the sample while removing bulk water, and this has been a major barrier for applications to biological systems. Furthermore, recent applications of imaging mass spectrometry to cell biology, microbial communities, and biosynthetic pathways are summarized briefly, and studies of biological membrane organization are described in greater ...
Capillary electrophoresis (CE) offers fast and high-resolution separation of charged analytes from small injection volumes. Coupled to mass spectrometry (MS), it represents a powerful analytical technique providing (exact) mass information and enables molecular characterization based on fragmentation. Although hyphenation of CE and MS is not straightforward, much emphasis has been placed on enabling efficient ionization and user-friendly coupling. Though several interfaces are now commercially available, research on more efficient and robust interfacing with nano-electrospray ionization (ESI), matrix-assisted laser desorption/ionization (MALDI) and inductively coupled plasma mass spectrometry (ICP) continues with considerable results. At the same time, CE-MS has been used in many fields, predominantly for the analysis of proteins, peptides and metabolites. This review belongs to a series of regularly published articles, summarizing 248 articles covering the time between June 2016 and May 2018. Latest
Structural characterization of ions in the gas phase is facilitated by measurement of ion collision cross sections (CCS) using techniques such as ion mobility spectrometry. Further information is gained from CCS measurement when comparison is made between measurements and accurately predicted CCSs for model ion structures and the gas in which measurements are made. While diatomic gases, namely molecular nitrogen and air, are being used in CCS measurement with increasingly prevalency, the majority of studies in which measurements are compared to predictions use models in which gas molecules are spherical or non-rotating, which is not necessarily appropriate for diatomic gases. Here, we adapt a momentum transfer based CCS calculation approach to consider rotating, diatomic gas molecule collisions with polyatomic ions, and compare CCS predictions with a diatomic gas molecule to those made with a spherical gas molecular for model spherical ions, tetra-alkylammonium ions, and multiply charged ...
Electrospray ionization with an ultralow flow rate (≤4 nanoliters per minute) was used to directly couple capillary electrophoresis with tandem mass spectrometry for the analysis and identification of biomolecules in mixtures. A Fourier transform mass spectrometer provided full spectra (,30 kilodaltons) at a resolving power of ≈60,000 for injections of 0.7 × 10−18 to 3 × 10−18 mole of 8- to 29-kilodalton proteins with errors of ,1 dalton in molecular mass. Using a crude isolate from human blood, a value of 28,780.6 daltons (calculated, 28,780.4 daltons) was measured for carbonic anhydrase, representing 1 percent by weight of the protein in a single red blood cell. Dissociation of molecular ions from 9 × 10−18 mole of carbonic anhydrase gave nine sequence-specific fragment ions, more data than required for unique retrieval of this enzyme from the protein database.. ...
TY - JOUR. T1 - Mining gene functional networks to improve mass-spectrometry-based protein identification. AU - Ramakrishnan, Smriti R.. AU - Vogel, Christine. AU - Kwon, Taejoon. AU - Penalva, Luiz O. AU - Marcotte, Edward M.. AU - Miranker, Daniel P.. PY - 2009/11/15. Y1 - 2009/11/15. N2 - Motivation: High-throughput protein identification experiments based on tandem mass spectrometry (MS/MS) often suffer from low sensitivity and low-confidence protein identifications. In a typical shotgun proteomics experiment, it is assumed that all proteins are equally likely to be present. However, there is often other evidence to suggest that a protein is present and confidence in individual protein identification can be updated accordingly. Results: We develop a method that analyzes MS/MS experiments in the larger context of the biological processes active in a cell. Our method, MSNet, improves protein identification in shotgun proteomics experiments by considering information on functional associations ...
Part I. Field desorption (FD) mass spectra have been obtained from a series of alkali metal cryptates formed from {2.2.2}-, {2.2.1}- and {2.1.1}-cryptands with Li(+), Na(+) and K(+) salts of Cl(-), Br(-), I(-), OTs(-) and BPh(,4)(-). Stabilities of these complexes under FD conditions are compared with their thermodynamic stabilities in solution. Differences in these stabilities are attributed to the lack of solvation of ions under FD conditions. A marked anion effect is also observed in FD spectra. This effect is correlated with the recombination energy of the released cation and anion in the gaseous state. Part II. Acid phthalates from isomeric alicyclic alcohols have been studied by field desorption (FD) and electron impact (EI) mass spectrometry. Isomeric acid phthalates gave identical FD spectra and EI spectra. The use of these methods for distinguishing stereoisomers of this type thus proved to be unsuccessful. However, the field ionization (FI) spectra of cis- and trans-4-t-butylcyclohexyl
Ion mobility-mass spectrometry (IM-MS) is a rapid, gas-phase separation technique that has become an integral part of the analytical repertoire of techniques for the -omics. This method coupl
Figure 1: Estimation of Ion Competition via Correlated Responsivity Offset in Linear Ion Trap Mass Spectrometry Analysis: Theory and Practical Use in the Analysis of Cyanobacterial Hepatotoxin Microcystin-LR in Extracts of Food Additives
Law, W.S., Huang, P.Y., Li, S.F.Y., Ong, E.S., Ong, C.N., Sethi, S.K., Saw, S. (2009). Combination of1H nuclear magnetic resonance spectroscopy and liquid chromatography/mass spectrometry with pattern recognition techniques for evaluation of metabolic profile associated with albuminuria. Journal of Proteome Research 8 (4) : 1828-1837. [email protected] Repository. ...
TY - JOUR. T1 - Methods and Algorithms for Quantitative Proteomics by Mass Spectrometry. AU - Matthiesen, Rune. AU - Carvalho, Ana Sofia. PY - 2020/1/1. Y1 - 2020/1/1. N2 - Protein quantitation by mass spectrometry has always been a resourceful technique in protein discovery, and more recently it has leveraged the advent of clinical proteomics. A single mass spectrometry analysis experiment provides identification and quantitation of proteins as well as information on posttranslational modifications landscape. By contrast, protein array technologies are restricted to quantitation of targeted proteins and their modifications. Currently, there are an overwhelming number of quantitative mass spectrometry methods for protein and peptide quantitation. The aim here is to provide an overview of the most common mass spectrometry methods and algorithms used in quantitative proteomics and discuss the computational aspects to obtain reliable quantitative measures of proteins, peptides and their ...
Autor: Manz, Christian; Genre: Hochschulschrift; Titel: Automated Analysis of Complex Carbohydrates via Ion Mobility-Mass Spectrometry
Pre-sputtering before secondary ion mass spectrometry measurement is a well known technique to increase the detection limits of atmospheric gas elements: during a prolonged primary ion bombardment of a clean target a layer on the sample surface and the immersion lens is formed which decreases the re-implantation pr
High surface sensitivity and lateral resolution imaging make time-of-flight secondary ion mass spectrometry (ToF-SIMS) a unique and powerful tool for biological analysis. However, with the leaps forward made in the capabilities of the ToF-SIMS instrumentation, the data being recorded from these instruments has dramatically increased. Unfortunately, with these large, often complex, datasets, a bottleneck appears in their processing and interpretation. Here, an application of peak picking is described and applied to ToF-SIMS images allowing for large compression of data, noise removal and improved contrast, while retaining a high percentage of the original signal. Peak picking is performed to locate peaks within ToF-SIMS data. By using this information, signal arising from the same distribution can be summed and overlapping signals separated. As a result, the data size and complexity can be dramatically reduced. This method also acts as an effective noise filter, discarding unwanted noise from the data
Description of Technique. Time of Flight Secondary Ion Mass Spectrometry (ToF-SIMS) is an analytical technique used to obtain elemental and molecular chemical data about surfaces (static SIMS), and detect parts per billion (ppb) concentrations of impurities in semiconductors and metals (dynamic SIMS).
TY - JOUR. T1 - Multi-isotope imaging mass spectrometry reveals slow protein turnover in hair-cell stereocilia. AU - Zhang, Duan Sun. AU - Piazza, Valeria. AU - Perrin, Benjamin J.. AU - Rzadzinska, Agnieszka K.. AU - Poczatek, J. Collin. AU - Wang, Mei. AU - Prosser, Haydn M.. AU - Ervasti, James M.. AU - Corey, David P.. AU - Lechene, Claude P.. PY - 2012/1/26. Y1 - 2012/1/26. N2 - Hair cells of the inner ear are not normally replaced during an animals life, and must continually renew components of their various organelles. Among these are the stereocilia, each with a core of several hundred actin filaments that arise from their apical surfaces and that bear the mechanotransduction apparatus at their tips. Actin turnover in stereocilia has previously been studied by transfecting neonatal rat hair cells in culture with a β-actin-GFP fusion, and evidence was found that actin is replaced, from the top down, in 2-3 days. Overexpression of the actin-binding protein espin causes elongation of ...
An accurate method based on matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS) has been developed for quantitative analysis of calcitonin and insulin in different commercially available pharmaceutical products. Tryptic peptides derived from these polypeptides were chemically modified at their C-terminal lysine-residues with 2-methoxy-4,5-dihydro-imidazole (light tagging) as standard and deuterated 2-methoxy-4,5-dihydro-imidazole (heavy tagging) as internal standard (IS). The heavy modified tryptic peptides (4D-Lys tag), differed by four atomic mass units from the corresponding light labelled counterparts (4H-Lys tag). The normalized peak areas (the ratio between the light and heavy tagged peptides) were used to construct a standard curve to determine the concentration of the analytes. The concentrations of calcitonin and insulin content of the analyzed pharmaceutical products were accurately determined, and less than 5% error was obtained between the ...
In May 2013, an 18-year-old patient arrived at the University of California-San Francisco emergency department in status epilepticus after reportedly taking two blotter papers of lysergic acid diethylamide (LSD). Over the course of his hospital stay, clinicians ruled out other causes of seizures and suspected that his episode was related to the ingestion. However, LSD does not typically cause seizures, and routine drug screening didnt provide any clues. Extended toxicology screening was requested, and using liquid chromatography-high resolution mass spectrometry (LC-HRMS), we identified dimethoxychloroamphetamine (DOC) in the patients urine and serum.1 DOC is a potent hallucinogen that is often mistaken for LSD, and at high doses, has been reported to cause seizures.
Dynamic Secondary Ion Mass Spectrometry. Essential Knowledge Briefing Dynamic Secondary Ion Mass Spectrometry Surface analysis is the cornerstone of a wide range of scientific disciplines, from
Press release - Clinical Mass Spectrometry Market Report 2018 - Clinical Mass Spectrometry Market Report 2018: Segmentation by Product (GAS Chromatography-Mass Spectrometry, Liquid Chromatography-Mass Spectrometry, MALDI TOF Mass Spectrometer, Capillary Electrophoresis-Mass Spectrometry, Ion Mobility Spectrometry-Mass - published on
TY - JOUR. T1 - Quantitation of the anticancer drug abiraterone and its metabolite Δ(4)-abiraterone in human plasma using high-resolution mass spectrometry. AU - Bhatnagar, Atul. AU - McKay, Matthew J.. AU - Crumbaker, Megan. AU - Ahire, Ketan. AU - Karuso, Peter. AU - Gurney, Howard. AU - Molloy, Mark P.. PY - 2018/5/30. Y1 - 2018/5/30. N2 - Abiraterone acetate is administered as a prodrug to patients with metastatic, castration-resistant prostate cancer (mCRPC) and is readily metabolized into the potent 17a-hydroxylase/17,20-lyase (CYP17) enzyme inhibitor and androgen receptor inhibitor abiraterone and Δ(4)-abiraterone (D4A), respectively. To investigate pharmacokinetic variability in abiraterone acetate metabolism we developed highly sensitive liquid chromatography/mass spectrometry (LC/MS) assays for the simultaneous quantitation of abiraterone and D4A in human plasma using high-resolution mass spectrometry (HRMS) on an Orbitrap mass spectrometer. This study demonstrates the quantitative ...
TY - JOUR. T1 - Probing conformational changes of ubiquitin by host-guest chemistry using electrospray ionization mass spectrometry. AU - Lee, Jong Wha. AU - Heo, Sung Woo. AU - Lee, Shin Jung C.. AU - Ko, Jae Yoon. AU - Kim, Hyungjun. AU - Kim, Hugh I.. PY - 2013/1/1. Y1 - 2013/1/1. N2 - We report mechanistic studies of structural changes of ubiquitin (Ub) by host-guest chemistry with cucurbit[6]uril (CB[6]) using electrospray ionization mass spectrometry (ESI-MS) combined with circular dichroism spectroscopy and molecular dynamics (MD) simulation. CB[6] binds selectively to lysine (Lys) residues of proteins. Low energy collision-induced dissociation (CID) of the protein-CB[6] complex reveals CB[6] binding sites. We previously reported (Anal. Chem. 2011, 83, 7916-7923) shifts in major charge states along with Ub-CB[6] complexes in the ESI-MS spectrum with addition of CB[6] to Ub from water. We also reported that CB[6] is present only at Lys6 or Lys11 in high charge state (+13) complex. In this ...
Metal ions play significant roles in biological processes, and investigation of metal-protein interactions provides a basis to understand the functions of metal ions in such systems. In the current study, a novel matrix-assisted nanoelectrospray ionization mass spectrometry (MANESI-MS) method was developed for inve
TY - JOUR. T1 - An evaluation of the utility of in vacuo methylation for mass-spectrometry-based analyses of peptides. AU - Laremore, Tatiana Nikolaevna. AU - Weber, David M.. AU - Choma, Christin T.. PY - 2005/8/3. Y1 - 2005/8/3. N2 - In vacuo trimethylation of the N-terminus of a lyophilized peptide with methyl iodide was previously reported to enhance the peptides signal in matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) and to suppress alkali adduct formation in electrospray ionization mass spectrometry (ESI-MS). Both the signal enhancement and alkali adduct suppression observed for methylated peptides are believed to be due to the permanent positive charge on the N-terminus of the peptide resulting from the formation of a quaternary ammonium moiety. The present work evaluates the general utility of the in vacuo methylation procedure for the MS analysis of peptides, and specifically addresses the issue of whether the methylation of nucleophilic sites other than the ...
TY - JOUR. T1 - Targeted peptide measurements in biology and medicine. T2 - Best practices for mass spectrometry-based assay development using a fit-for-purpose approach. AU - Carr, Steven A.. AU - Abbatiello, Susan E.. AU - Ackermann, Bradley L.. AU - Borchers, Christoph. AU - Domon, Bruno. AU - Deutsch, Eric W.. AU - Grant, Russell P.. AU - Hoofnagle, Andrew N.. AU - Hüttenhain, Ruth. AU - Koomen, John M.. AU - Liebler, Daniel C.. AU - Liu, Tao. AU - MacLean, Brendan. AU - Mani, D. R.. AU - Mansfield, Elizabeth. AU - Neubert, Hendrik. AU - Paulovich, Amanda G.. AU - Reiter, Lukas. AU - Vitek, Olga. AU - Aebersold, Ruedi. AU - Anderson, Leigh. AU - Bethem, Robert. AU - Blonder, Josip. AU - Boja, Emily. AU - Botelho, Julianne. AU - Boyne, Michael. AU - Bradshaw, Ralph A.. AU - Burlingame, Alma L.. AU - Chan, Daniel. AU - Keshishian, Hasmik. AU - Kuhn, Eric. AU - Kinsinger, Christopher. AU - Lee, Jerry S H. AU - Lee, Sang Won. AU - Moritz, Robert. AU - Oses-Prieto, Juan. AU - Rifai, Nader. AU - ...
The fast atom bombardment (FAB) mass spectra of bouvardin (1) 6-O-methylbouvardin (2), deoxybouvardin (3) and a synthetic analog (4) have been examined. The spectra of the bicyclic compounds 1-3 display site-directed fragmentations resulting from the presence of a phenolic bridged tyrosine moiety un …
Data Availability StatementThe mass spectrometry proteomics data have already been deposited towards the ProteomeXchange Consortium via the Satisfaction partner repository using the dataset identifier PXD002600 and 10. poorer inducing and result chemotherapy level of resistance in stable tumors. The unique trend of pseudo-hypoxia linked to mutation was seen in clear-cell, however, not in papillary RCC, and the treating this subtype of Wisp1 cancer is demanding continue to. Despite the intro of fresh antiangiogenic targeted treatments (tyrosine kinase inhibitors, TKIs), individuals develop both major and acquired level of resistance even now. Overcoming level of resistance to TKIs, in papillary RCC also, could be possible simply by finding modified protein expression considerably. To get this done, hypoxic 3D in vitro versions must be created to mimic both molecular pathways normal for low air pressure and cellCcell dynamics in tumor-like spatial constructions. Outcomes Clear-cell and papillary ...
TY - JOUR. T1 - A combination of molecular probe-tandem electrospray ionization mass spectrometry. T2 - A technique for tracing structural changes in phospholipid hydroperoxides. AU - Shimizu, Rumiko. AU - Nagai, Ai. AU - Tominaga, Hiroko. AU - Imura, Megumi. AU - Onyango, Arnold N.. AU - Izumi, Minoru. AU - Nakajima, Shuhei. AU - Tahara, Shoichi. AU - Kaneko, Takao. AU - Baba, Naomichi. PY - 2009. Y1 - 2009. N2 - An ethyl-labeled phosphatidylcholine hydroperoxide (PC-OOH/Et 2) was synthesized as a molecular probe for naturally occurring PC-OOH 1. Applying the precursor ion scan mode in tandem ESI mass spectrometry at m/z 198, a signal of the PC-OOH/Et 2 alone could be selectively detected even in the presence of a large excess of a complex mixture of phospholipids in the blood. Furthermore, molecular species that formed from PC-OOH/Et 2 by its degradation in the blood were also observed in the same spectrum. Since the molecular probe-and-mass spectrometry-assisted analytical method presented ...
Sports doping in both humans and animals is a widespread problem. Paper spray is a direct ionization technique that simplifies the mass spectrometric analysis of compounds from physiological fluids, making it an attractive method for clinical research and forensic toxicology applications. In this work, methamphetamine and other stimulant drugs were spiked in horse urine to demonstrate the potential of the technique to monitor sport doping in horse racing. Paper spray ionization presents chall
Sequencing with mass spectrometry[edit]. Mass spectrometry may be used to determine DNA sequences. Matrix-assisted laser ... The mass of each nucleotide is different from the others and this difference is detectable by mass spectrometry. Single- ... Edwards JR, Ruparel H, Ju J (2005). "Mass-spectrometry DNA sequencing". Mutation Research. 573 (1-2): 3-12. doi:10.1016/j. ... Monforte JA, Becker CH (1 March 1997). "High-throughput DNA analysis by time-of-flight mass spectrometry". Nature Medicine. 3 ( ...
... also known as Fourier transform mass spectrometry) is a type of mass spectrometry used for determining the mass-to-charge ratio ... Fourier transform ion cyclotron resonance mass spectrometry: a primer. Mass Spectrom Rev 17, 1-35. ... Fourier transform mass spectrometry[edit]. Main article: Fourier transform ion cyclotron resonance ... High-precision mass determination of unstable nuclei with a Penning trap mass spectrometer at ISOLDE/CERN, Switzerland ...
Mass Spectrometry[edit]. Mass spectrometry can be used to determine whether the protein is light-chain or familial amyloidosis ...
"Early gas chromatography/mass spectrometry". Journal of the American Society for Mass Spectrometry. 4 (5): 367-371. doi:10.1016 ... Gas chromatography-mass spectrometry (GC-MS) is an analytical method that combines the features of gas-chromatography and mass ... Amirav A, Gordin A, Poliak M, Fialkov AB (2008). "Gas chromatography-mass spectrometry with supersonic molecular beams". J Mass ... Pyrolysis-gas chromatography-mass spectrometry. References[edit]. *^ O. David Sparkman; Zelda Penton; Fulton G. Kitson (17 May ...
In 1991, the thomson (symbol: Th) was proposed as a unit to measure mass-to-charge ratio in mass spectrometry in his honour.[28 ... J.J. Thomson's separation of neon isotopes by their mass was the first example of mass spectrometry, which was subsequently ... Isotopes and mass spectrometry[edit]. In the bottom right corner of this photographic plate are markings for the two isotopes ... were the first use of mass spectrometry and led to the development of the mass spectrograph.[2] ...
This technique is primarily used in the field of mass spectrometry. When incorporated with a mass spectrometer the complete ... Spark source mass spectrometry (SSMS)[edit]. The rf spark source creates ions with a wide energy spread (2-3 kV), which ... H. E. Beske, A. Hurrle and K. P. Jochum (1981). "Part I. Principles of spark source mass spectrometry (SSMS)". Fresenius' ... Review and Evaluation of Spark Source Mass Spectrometry as an Analytical Method". Fresenius' Zeitschrift für Analytische Chemie ...
... mass spectrometry; advanced microscopy. Cancer Research. Principal cancer types under study: breast, prostate, blood (leukemia ...
Mass Spectrometry. Mass spectrometry. Fast atom bombardment. Electron ionization. Chemical ionization. Electrospray ionization ... Quadrupole mass analyzer. Time-of-flight mass spectrometry. Electron multiplier. Faraday cup. Carbon-13. Infrared multiphoton ...
Mass spectrometry Provides information on molecular mass, composition, sequence, and sometimes branching of a glycan chain. It ... Dell A (2001). "Glycoprotein Structure Determination by Mass Spectrometry". Science. 291 (5512): 2351-2356. Bibcode:2001Sci... ... The viral spike of the human immunodeficiency virus is heavily glycosylated.[8] Approximately half the mass of the spike is ... provides information on molecular mass, protein-carbohydrate ratio, aggregation state, size, and sometimes branching of a ...
Mass spectrometry: Used to determine the molecular weight of a compound and from mass spectrum analysis its structure. High ... See also mass spectrometry, below.. *Infrared spectroscopy: Chiefly used to determine the presence (or absence) of certain ... resolution mass spectrometry can often identify the precise formula of a compound through knowledge of isotopic masses and ... In practice, small molecules have a molar mass less than approximately 1000 g/mol. ...
Biological Mass Spectrometry. 7 (6): 247-56. doi:10.1002/bms.1200070605.. *^ a b c d J.E. Joy; S. J. Watson, Jr.; J.A. Benson, ... Fonseca BM, Correia-da-Silva G, Almada M, Costa MA, Teixeira NA; Correia-Da-Silva; Almada; Costa; Teixeira (2013). "The ... A 2000 study by researchers at Boston's Beth Israel Deaconess Medical Center, Massachusetts General Hospital and Harvard School ... Lyons, Casey (October 2012) Lost in the Weeds: Legalizing Medical Marijuana in Massachusetts. Boston Magazine. ...
Journal of Mass Spectrometry. 1999 Jun;34(6):651-60.. ... Coca alkaloids Scheidweiler KB, Shojaie J, Plessinger MA, Wood ... Electron ionization mass fragmentometric detection of urinary ecgonidine, a hydrolytic product of methylecgonidine, as an ...
... studies on its metabolism and toxicological detection in rat urine using gas chromatography/mass spectrometry". Journal of Mass ...
"Gas Chromatography-Mass Spectrometry". American Chemical Society. Retrieved 19 Nov 2019.. *^ "Marine Surplus Seller, Issues 13- ... Beginning in the 1960s, Bendix produced scientific instruments such as the Bendix MA-2 Time-of-Flight Mass Spectrometer.[12] ... Harrington of Bendix Aviation in the 1950s led to the combination of gas chromatography and mass spectrometry, and the ... development of Gas chromatography-mass spectrometry instrumentation. ...
"Int J Mass Spectrometry. 367: 28-34. Bibcode:2014IJMSp.367...28G. doi:10.1016/j.ijms.2014.04.015. PMC 4375673. PMID 25844054.. ... More recently large-scale mass spectrometry analyses have been used to determine sites of protein phosphorylation. Over the ... However, the analysis of phosphorylated peptides by mass spectrometry is still not as straightforward as for "regular", ... Advanced, highly accurate mass spectrometers are needed for these studies, limiting the technology to labs with high-end mass ...
Journal of Mass Spectrometry. 51 (11): 1080-1089. doi:10.1002/jms.3840. ISSN 1096-9888. PMID 27535017.. ...
Mass spectrometry of hydantoin-derived selective androgen receptor modulators. Journal of Mass Spectrometry. 2008 May;43(5):639 ...
Journal of Mass Spectrometry. 43 (3): 305-16. doi:10.1002/jms.1312. PMID 17968862.. ... in rat urine using gas chromatography-mass spectrometry". Journal of Chromatography A. 1186 (1-2): 380-90. doi:10.1016/j.chroma ... in rat urine using gas chromatography-mass spectrometry". Forensic Science International. 181 (1-3): 47-51. doi:10.1016/j. ... Studies on their metabolism and toxicological detection in rat urine using gas chromatographic/mass spectrometric techniques". ...
Rapid Communications in Mass Spectrometry. 25 (18): 2591-602. doi:10.1002/rcm.5158. PMID 23657953.. ... including mass spectrometry, UV absorption, IR absorption, and NMR, established that quebrachine and yohimbine are one and the ... Molar mass. 354.44 g/mol (base). 390.90 g/mol (hydrochloride) g·mol−1. ... yohimbe bark with ultra-performance liquid chromatography coupled with ion mobility quadrupole time-of-flight mass spectrometry ...
... by gas chromatography/mass spectrometry and liquid chromatography/quadrupole time-of-flight mass spectrometry". Rapid ... plasma or urine by gas chromatography-mass spectrometry or liquid chromatography-mass spectrometry to confirm a diagnosis of ... Journal of Mass Spectrometry. 45 (12): 1426-42. doi:10.1002/jms.1859. PMID 21053377. Baselt RC (2014). Disposition of toxic ... Communications in Mass Spectrometry. 24 (18): 2706-14. doi:10.1002/rcm.4692. PMID 20814976. Michaelis, W.; Russel, J. H.; ...
Rapid Communications in Mass Spectrometry. 18 (3): 251-6. doi:10.1002/rcm.1319. PMID 14755608.. ... underivatized theanine enantiomers by high-performance liquid chromatography/atmospheric pressure ionization-mass spectrometry ...
Gabrielse, G. (2006). "Antiproton mass measurements". International Journal of Mass Spectrometry. 251 (2-3): 273-280. Bibcode: ... current quark mass refers to the mass of a quark by itself, while constituent quark mass refers to the current quark mass plus ... of the mass. The rest mass of a proton is, thus, the invariant mass of the system of moving quarks and gluons that make up the ... see mass in special relativity). A proton has a mass of approximately 938 MeV/c2, of which the rest mass of its three valence ...
Mass spectrometry techniques are used.. Proteomics[edit]. Proteome is the entire complement of proteins, including the ... Mass spectrometry techniques are used. *Immunoproteomics: study of large sets of proteins (proteomics) involved in the immune ... Uses proteomics mass spectrometry data for protein expression studies. *Proteogenomics: An emerging field of biological ... typically using imaging mass spectrometry data.[13]. *Ethomics: Is the high-throughput machine measurement of animal behaviour. ...
Rapid Communications in Mass Spectrometry. 32 (20): 1791-1798. Bibcode:2018RCMS...32.1791Z. doi:10.1002/rcm.8222. PMID 29964303 ... Journal of the American Society for Mass Spectrometry, Volume 18, Issue 10, October 2007, Pages 1774-1782 ... Determination of Pyridine Alkaloids in Tobacco by PFTBA Ions/Analyte Molecule Reaction Ionization Ion Trap Mass Spectrometry, ... by dispersive solid-phase extraction coupled with ultra-performance liquid chromatography/Tandem orbitrap mass spectrometry". ...
Mass resolution[edit]. In a similar way mass resolution is a parameter that characterizes the capability of recoil spectrometry ... Dynamic Secondary Ion Mass Spectrometry DSIMS 1012 - 1016 atoms/cm3[7] 2 - 30 nm[7] 50 nm to 2 µm[7] Elemental Depth Profile ... The E2 transferred by projectile ions of mass m1 and energy E1 to sample atoms of mass m2 recoiling at an angle ϕ, with respect ... 9)[19] with a recoil angle of Φ.[19] The variable r is the ratio of mass of the incident nuclei to that of the mass of the ...
... by gas chromatography/mass spectrometry and liquid chromatography/quadrupole time-of-flight mass spectrometry". Rapid ... plasma or urine by gas chromatography-mass spectrometry or liquid chromatography-mass spectrometry to confirm a diagnosis of ... Journal of Mass Spectrometry. 45 (12): 1426-42. Bibcode:2010JMSp...45.1426M. doi:10.1002/jms.1859. PMID 21053377.. ... Communications in Mass Spectrometry. 24 (18): 2706-14. Bibcode:2010RCMS...24.2706S. doi:10.1002/rcm.4692. PMID 20814976.. ...
However it has been detected using mass spectrometry. It is the neutral equivalent of the deltate anion C3O32−, known since ... International Journal of Mass Spectrometry. 188 (1-2): 17-25. Bibcode:1999IJMSp.188...17S. doi:10.1016/S1387-3806(98)14208-2. ... Schröder, Detlef; Helmut Schwarz; Suresh Dua; Stephen J. Blanksby; John H. Bowie (1999). "Mass spectrometric studies of the ... Skujins, S.; J. Delderfield, G.A. Webb (1968). "A mass spectrometric study of some monocyclic polycarbonyl compounds". ...
Ellis, Andrew M.; Mayhew, Christopher A. (2014). Proton Transfer Reaction Mass Spectrometry - Principles and Applications. ... Direct injection mass spectrometry techniques are frequently utilized for the rapid detection and accurate quantification of ... International Journal of Mass Spectrometry. 368: 1-5. Bibcode:2014IJMSp.368....1S. doi:10.1016/j.ijms.2014.05.004.. ... "Direct-injection mass spectrometry adds the time dimension to (B)VOC analysis". Trends in Analytical Chemistry. 30 (7): 1003- ...
"Rapid Communications in Mass Spectrometry. 30 (18): 2043-2051. doi:10.1002/rcm.7684. ISSN 0951-4198.. ... "Quantitation of α-hydroxy acids in complex prebiotic mixtures via liquid chromatography/tandem mass spectrometry". ...
"The potential of ion mobility mass spectrometry for tuning synthetic host guest systems: A case study using novel zinc(II) ... dipicolylamine anion sensors". International Journal of Mass Spectrometry. Bibcode:2015IJMSp.391...62N. doi:10.1016/j.ijms. ...
"Proton transfer mass spectrometry of peptides. A rapid heating technique for underivatized peptides containing arginine" (PDF) ...
離子遷移光譜-質譜法(英語:on-mobility spectrometry-mass spectrometry)(IMS/MS,或IMMS)是一種技術,在引入質譜儀之前,離子首先通過一些中性氣體在施加的電勢梯度下通過漂移時間分離[6] 。漂移時間是相對 ... Peptide and protein analysis by electrospray ionization-mass spectrometry and capillary electrophoresis-mass spectrometry. ... 生物質譜分
2004). "Mass spectrometry analysis of recombinant human ZP3 expressed in glycosylation-deficient CHO cells". Biochemistry. 43 ( ...
... and mass spectrometry". J. Proteome Res. 4 (6): 2070-80. doi:10.1021/pr0502065. PMC 1850943 . PMID 16335952.. ... "Molecular medicine (Cambridge, Mass.). 16 (9-10): 389-99. doi:10.2119/molmed.2010.00044. PMC 2935949 . PMID 20498921.. ... Liu T, Qian WJ, Gritsenko MA, et al. (2005). "Human plasma N-glycoproteome analysis by immunoaffinity subtraction, hydrazide ...
Center for Mass Spectrometry. Stevens har samarbeid med Kongsbergindustrien og de norske institusjonene NTNU, Høgskolen i ...
... tyrosine phosphorylation sites from human T cells using immobilized metal affinity chromatography and tandem mass spectrometry ... Ostendorff HP، Peirano RI، Peters MA، Schlüter A، Bossenz M، Scheffner M، Bach I (2002). "Ubiquitination-dependent cofactor ... "Exploring proteomes and analyzing protein processing by mass spectrometric identification of sorted N-terminal peptides.". Nat ...
... of flavonoids in honey by HPLC coupled with coulometric electrode array detection and electrospray ionization mass spectrometry ... Feitelson MA, Arzumanyan A, Kulathinal RJ, Blain SW, Holcombe RF, Mahajna J, Marino M, Martinez-Chantar ML, Nawroth R, Sanchez- ... Barnes S, Prasain J, D'Alessandro T, Arabshahi A, Botting N, Lila MA, Jackson G, Janle EM, Weaver CM (May 2011). "The ...
MA-FISH[edit]. Microfluidics-assisted FISH (MA-FISH) uses a microfluidic flow to increase DNA hybridization efficiency, ... MA-FISH is applied for detecting the HER2 gene in breast cancer tissues.[16] ...
"Bioinformatics in mass spectrometry data analysis for proteomics studies". Expert Review of Proteomics 1 (4). Páxs. 469-483.. ...
... pyrene in Human Bronchoalveolar H358 Cells Using Liquid Chromatography-Mass Spectrometry". Chem. Res. Toxicol. 20 (9): 1331- ... Clark RS, Pellom ST, Booker B, Ramesh A, Zhang T, Shanker A, Maguire M, Juarez PD, Patricia MJ, Langston MA, Lichtveld MY, Hood ...
The refractive index, nD, for sucrose solutions of various percentage by mass has been measured and tables of nD vs. °Bx ... Fourier Transform Infrared Spectrometry) techniques. In the former case, in-line instruments are available which allow constant ... If using the ICUMSA tables,[4] he or she would report in mass fraction (m.f.). It is not, typically, actually necessary to ... For example, an 11.0% by mass D-Glucose ("grape sugar") solution measured 10.9 °Bx using a hand held instrument.[citation ...
Feral parrot flocks can be formed after mass escapes of newly imported, wild-caught parrots from airports or quarantine ... Revealed by Multiple-angle Spectrometry". Journal of Avian Medicine and Surgery. 20 (1): 8-14. doi:10.1647/1082-6742(2006)20[8: ...
... encodes a 51.2 kDa protein that is composed of 474 amino acids; 124 peptides have been observed through mass spectrometry ... 2003). "Exploring proteomes and analyzing protein processing by mass spectrometric identification of sorted N-terminal peptides ...
Typically the presence of an amine functional group is deduced by a combination of techniques, including mass spectrometry as ...
Mass spectrometryEdit. Main article: Mass spectrometry. In mass spectrometry, the molecular mass of a small molecule is usually ... Not to be confused with Molar mass or Mass number.. The molecular mass (m) is the mass of a given molecule: it is measured in ... The molecular mass and relative molecular mass are distinct from but related to the molar mass. The molar mass is defined as ... The molecular mass of small to medium size molecules, measured by mass spectrometry, can be used to determine the composition ...
Mass spectrometry is being studied as a diagnostic tool in COPD.[198] ... Puhan MA, Gimeno-Santos E, Cates CJ, Troosters T (December 2016). "Pulmonary rehabilitation following exacerbations of chronic ... Puhan MA, Gimeno-Santos E, Cates CJ, Troosters T (December 2016). "Pulmonary rehabilitation following exacerbations of chronic ... Vollenweider DJ, Frei A, Steurer-Stey CA, Garcia-Aymerich J, Puhan MA (October 2018). "Antibiotics for exacerbations of chronic ...
... lateriflora by liquid chromatography with ultraviolet photodiode array and electrospray ionization tandem mass spectrometry". ... Liu X, Hong SI, Park SJ, Dela Peña JB, Che H, Yoon SY, Kim DH, Kim JM, Cai M, Risbrough V, Geyer MA, Shin CY, Cheong JH, Park H ...
... and a Novel Method for their Detection by Surface-Enhanced Laser Desorption Ionization Time-of-Flight Mass Spectrometry (SELDI- ... Lu Z, Zhang QC, Lee B, Flynn RA, Smith MA, Robinson JT, Davidovich C, Gooding AR, Goodrich KJ, Mattick JS, Messirov JP, Cech TR ... Saffran WA, Ahmed A, Binyaminov O, Gonzalez C, Gupta A, Fajardo MA, Kishun D, Nandram A, Reyes K, Scalercio K, Senior CW (2014 ...
These were characterized using accurate mass LC-MS, LC-MS/MS and multistage mass spectrometry (MSn).[16] The last of the six ... Williamson BL, Johnson KL, Tomlinson AJ, Gleich GJ, Naylor S (October 1998). "On-line HPLC-tandem mass spectrometry structural ...
"Large-scale mapping of human protein-protein interactions by mass spectrometry". Mol. Syst. Biol. 3 (1): 89. doi:10.1038/ ...
The particles that make up matter have rest mass as well - not all particles have rest mass, such as the photon. Matter can be ... some mass will be lost with it. High energy losses result in loss of weighable amounts of mass, an important topic in nuclear ... they may not necessarily have the same mass number; atoms of an element which have different mass numbers are known as isotopes ... The mass number is the sum of the number of protons and neutrons in a nucleus. Although all the nuclei of all atoms belonging ...
Mass spectrometry. *Chromatography. *Flow cytometry. *Blood bank. *Microbiological culture. *Serology. .mw-parser-output .asbox ...
... multiple ICP-mass spectrometers, and a multi-collector ICP-MS for isotope-ratio mass spectrometry. The laboratory is one of ...
Inductively coupled plasma mass spectrometry. *LBOZ. *Spectroradiometry. *Slope spectroscopy. *Microspectrophotometry. ...
... of indigoid compounds present in archaeological Maya blue by pyrolysis-silylation-gas chromatography-mass spectrometry. Journal ...
Collision-induced dissociation, a mass spectrometry mechanism. *Configuration interaction doubles, in quantum chemistry ...
As of 2015 mass spectrometry resolution is insufficient to exclude many false positives from the pool of peptides that may be ...
We develop proteomic tools for dissecting cellular function, with a special emphasis on the mass spectrometry (MS) of peptides ... with a special emphasis on the mass spectromet ... LABORATORY OF MASS SPECTROMETRY AND GASEOUS ION CHEMISTRY * ...
Main article: Ion-mobility spectrometry-mass spectrometry. Ion mobility spectrometry-mass spectrometry (IMS/MS or IMMS) is a ... accelerator mass spectrometry (AMS), thermal ionization-mass spectrometry (TIMS) and spark source mass spectrometry (SSMS). ... Photoionization mass spectrometry[edit]. Photoionization can be used in experiments which seek to use mass spectrometry as a ... Preparative mass spectrometry[edit]. The primary function of mass spectrometry is as a tool for chemical analyses based on ...
Mass spectrometry imaging (MSI) (also known as imaging mass spectrometry) is a technique used in mass spectrometry to visualize ... McDonnell LA, Heeren RM (2007). "Imaging mass spectrometry". Mass spectrometry reviews. 26 (4): 606-43. PMID 17471576. doi: ... Imaging Mass Spectrometry Markup Language: A Common Data Format for Mass Spectrometry Imaging in Data Mining in Proteomics: ... "Journal of the American Society for Mass Spectrometry. 24 (5): 718-721. PMC 3693088 . PMID 23536269. doi:10.1007/s13361-013- ...
Posted Jan 4, 2018, 9:20 AM by Mass Spec * MSF Closed 12/22/17 - 1/1/18 The Mass Spectrometry Facility will be closed from ... 2017 MS and NMR Seminar Series The UT Austin Chemistry Departments Mass Spectrometry and Nuclear Magnetic Resonance Facilities ... Posted Jun 8, 2017, 3:16 PM by Mass Spec * Mass Spec E-Mail List 5/9/17We have recently created a UT list e-mail group called ... Our facility offers support for the analysis of a wide variety of analytes using mass spectrometry based techniques. We have ...
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The instruments used in such studies are called mass spectrometers and mass spectrographs, and they operate on ... Mass spectrometry, analytic technique by which chemical substances are identified by the sorting of gaseous ions in electric ... and magnetic fields according to their mass-to-charge ratios. ... Mass spectrometry. Mass spectrometry differs from the types of ... Alternative Title: mass spectroscopy. Mass spectrometry, also called mass spectroscopy, analytic technique by which chemical ...
The Mass Spectrometry Center provides a suite of state-of-the-art instrumentation to UMass researchers with a broad range from ... The Mass Spectrometry Center provides a suite of state-of-the-art instrumentation to UMass researchers with a broad range from ... University of Massachusetts Amherst Search Google Appliance. Enter the terms you wish to search for. Links ...
... The Warwick Mass Spectrometry community includes scientists with a wide range of technical and applications ... Dr Mark Barrow (Petroleum-related and environmental samples using FT-ICR mass spectrometry) ... Dr Lijiang Song (Natural product chemistry, metabolomics, Head of Chemistry Mass Spectrometry Facility) ... Improving the performance and applications of Fourier Transform Ion Cyclotron Resonance (FTICR) mass spectrometers ...
In Mass Spectrometry of Glycoproteins: Methods and Protocols, expert researchers in the field detail many of the methods that ... Authoritative and practical, Mass Spectrometry of Glycoproteins: Methods and Protocol is an essential resource for those who ... Case Studies in Mass Spectrometry of Glycoproteins. * Front Matter Pages 277-277 ... Stable Isotope Labeling of N-Glycosylated Peptides by Enzymatic Deglycosylation for Mass Spectrometry-Based Glycoproteomics ...
Mass spectrometry: Mass spectrometry differs from the types of spectroscopy previously discussed because the molecular ... From the masses and abundance of the peaks in a mass spectrum, it is often possible to determine the exact mass of the molecule ... In a mass spectrometer, molecules are converted to charged fragments called ions, which are then separated according to their ... The chart that records the masses of the fragments together with a measure of their relative abundance is known as a mass ...
The Mass Spectrometry Data Center measures, compiles, evaluates, and correlates Standard Reference Data and develops and ... Mass Spectrometry Data Center Expand or Collapse*Mass Spectrometry Data Center Staff ... Mass Spectrometry Data Center. The Mass Spectrometry Data Center measures, compiles, evaluates, and correlates Standard ... reference tandem mass spectra of small molecules generated by electrospray and MALDI mass spectrometry widely used for ...
... forms and personnel for the Mass Spectrometry-Proteomics Core Laboratory at Baylor College of Medicine.... ... The Mass Spectrometry (MS) Proteomics Core at Baylor College of Medicine offers three specialized and comprehensive project ... mass spectrometry sequencing, and data analysis performed within the core and by the experienced core personnel. The Proteomics ... isolation and identification of endogenous or tagged protein complexes via immunoprecipitation followed by mass spectrometry ...
The mass spectrometry facility is housed in a 1000 sq ft laboratory located in the UMSL Research Building (R003). In addition ... A high-performance magnetic sector mass spectrometer for both high and low resolution mass spectral analysis equipped for:. * ... Double focusing capability provides accurate mass (+/- 1 mmu) if so desired; with appropriate calibration compounds, mass ... Analytical Facilities Microscopy X-Ray Diffraction Laboratory Molecular Modeling and Simulation High Field NMR Facility Mass ...
Mass Spectrometry. An in-depth treatment of modern mass spectrometry, instrumentation, and techniques with discussion of ... Mass Spectrometry Dwight Matthews Spring 2016 15168 CHEM 223 A Mass Spectrometry Dwight Matthews Spring 2012 13836 ... Mass Spectrometry Dwight Matthews Spring 2010 13340 CHEM 223 A Mass Spectrometry Dwight Matthews Fall 2007 92381 ... Mass Spectrometry Dwight Matthews Fall 2005 91280 CHEM 223 A Mass Spectrometry Dwight Matthews Fall 2003 91559 ...
Mass spectrometry of steroid systems. XII. Determination of the position of the double bond in some steroid systems by the ... Mass Spectrum Mass Number Androstane Sitosterol Steroid System Khimiya Prirodnykh Soerinenii, Vol. 3, No. 6, pp. 383-391, 1967 ... This permits compounds to be assigned to the Δ4 or Δ5 series on the basis of mass-spectrometric data. ...
Mass spectrometry-based proteomics.. Aebersold R1, Mann M.. Author information. 1. Institute for Systems Biology, 1441 North ... The ability of mass spectrometry to identify and, increasingly, to precisely quantify thousands of proteins from complex ... Recent successes illustrate the role of mass spectrometry-based proteomics as an indispensable tool for molecular and cellular ...
We provide fully assisted Mass Spectrometry services at highly competitive rates. Our Mass Spectrometry facilities are world- ... known as bioaffinity mass spectrometry.. Our researchers have extensive expertise in applying high resolution mass spectrometry ... Dont hesitate to contact us for more information on our Mass Spectrometry screening services - please get in touch with Mass ... Our Mass spectrometry facility. The GRIDD. MS. facility is equipped with state-of-the-art instruments. These high-resolution ...
These first nanoelectromechanical system-mass spectrometry spectra, obtained with modest mass sensitivity from only several ... some of which are unique to nanoelectromechanical system based-mass spectrometry. Mass detection of single biological molecules ... In our nanoelectromechanical-mass spectrometry system, nanoparticles and protein species are introduced by electrospray ... Here, we report the first demonstration of mass spectrometry based on single biological molecule detection with a ...
The Mass Spectrometry Unit performs quantitative and qualitative analysis of organic molecules using Mass spectrometry. ... Services include GC-MS analysis, LC-MS analysis, accurate mass determinations and Proteomic analysis.. The Mass Spectrometry ... Mass spectrometry (MS) with electrospray ionization (ESI) or atmospheric pressure chemical ionization (APCI) ... Tandem Mass Tag; Thermo Scientific). This method is based in the covalent attachment of an isobaric mass tag to all the samples ...
... including trypsin and alternative proteases specifically developed for mass spec applications. For middle-down proteomics of ... as well as peptide reference mixes and other reagents for monitoring mass spec instrument performance. ... Proteins are generally digested with proteases to generate peptides for mass spectrometry analysis (e.g., bottom-up proteomics ... Introduction to Mass Spectrometry. Mass spectrometry (MS) is a powerful analytical tool used for proteome-wide analysis and ...
Surface-sensitive mass spectrometry enables us to monitor the prompt (,10 μs) and simultaneous formation of primary On- ... Edited and published by : The Mass Spectrometry Society of Japan Produced and listed by : International Academic Publishing Co ... mass spectrometers have evolved to recent high-mass-resolution instruments for solar system exploration missions. ... Isotope analyses using mass spectrometers have been frequently utilized in the laboratories for the earth planetary science and ...
Open mass spectrometry search algorithm.. Geer LY1, Markey SP, Kowalak JA, Wagner L, Xu M, Maynard DM, Yang X, Shi W, Bryant SH ... In the Open Mass Spectrometry Search Algorithm (OMSSA), specificity is calculated by a classic probability score using an ...
Mass spectrometry is an aspect of science that could finally put the steroid era of baseball to an end. Learn about mass ... Mass spectrometer: The actual device used to carry out mass spectrometry. Some mass spectrometers can sit on a tabletop. Others ... Mass Spectrometry Basics: An Atomic Balance. --The principles behind mass spectrometry are somewhat abstract, so lets start ... What is Mass Spectrometry? American Society of Mass Spectrometry. (March 3, 2009) ...
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The functional parts of a mass spectrometer are detailed including the ionizer, mass analyzer and the detector. A simulation of ... Mass Spectrometry,/p,,p,In this video Paul Andersen explains how a spectrometer was used to identify the presence of isotopes. ... Chlorine isotopes along with an average atomic mass calculation is included.,/p, ... 009 - Mass Spectrometry. In this video Paul Andersen explains how a spectrometer was used to identify the presence of isotopes ...
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During the past ten years a variety of methods involving mass spectrom- etry have been developed for the analysis of ... Mass Spectrometry in Environmental Sciences. Editors: Hutzinger, O., Karasek, F.W., Safe, S. (Eds.) ... During the past ten years a variety of methods involving mass spectrom- etry have been developed for the analysis of ... Mass Spectrometry of Carbamates, Thiocarbamates, Dithiocarbamates, Urea, Thiourea, and Carboxanilide Pesticides. Onuska, ...
  • Schematics of a simple mass spectrometer with sector type mass analyzer. (
  • Thus he may be credited with the construction of the first mass spectrograph and the first mass spectrometer. (
  • Today chemists can use one of several different types of mass spectrometer. (
  • In simple terms, a mass spectrometer (all components of which operate in a high vacuum ) consists of an inlet chamber into which the compound to be analyzed is introduced and vaporized. (
  • A matrix-assisted laser desorption (MALDI) time of flight (TOF) mass spectrometer. (
  • The complexity of total proteome demands long gradients and preferably the use of an advanced mass spectrometer such as the Thermo Scientific fusion. (
  • For purified samples such as a single protein band from an SDS-PAGE gel, a 35 min gradient on the Velos mass spectrometer is sufficient. (
  • NASA's mass spectrometer sits aboard a DC-8 jet to be used as a flying lab that will study the impact of air pollution on the Arctic area. (
  • The instrument is an analytical tool known as a mass spectrometer . (
  • In 1919, Francis Aston improved on Thomson's methods and apparatus, leading to the first mass spectrometer -- a machine that literally weighs atoms and molecules. (
  • Today, chemists still use the mass spectrometer to measure the molecular weights of elements, isotopes and compounds. (
  • Next, we'll take a closer look at what's going on inside a mass spectrometer. (
  • 009 - Mass SpectrometryIn this video Paul Andersen explains how a spectrometer was used to identify the presence of isotopes. (
  • The functional parts of a mass spectrometer are detailed including the ionizer, mass analyzer and the detector. (
  • Any sample that you study with a mass spectrometer has many boron atoms in it. (
  • The Orbitrap Elite is a high performance hybrid mass spectrometer combining the high-field Orbitrap mass analyzer with the latest dual pressure linear ion trap, allowing increased speed, sensitivity and dynamic range. (
  • The TSQ Vantage is a triple quadrupole mass spectrometer. (
  • The LC-IRMS facility consists of an Accela autosampler and Accela 600 pump attached to a Delta V plus isotope ratio mass spectrometer via an LC-Isolink. (
  • The Ultraflex III is a Matrix Assisted Laser Desorption / Ionization time-of-flight mass spectrometer (MALDI-TOF/TOF) that provides the high resolution and mass accuracy required for analysis of a wide range of biomolecules. (
  • This ionized sample is then sent through a series of powerful magnets called a mass spectrometer, which separates sample ions on the basis of their mass/charge ratio. (
  • The output of a mass spectrometer. (
  • Main steps of measuring with a mass spectrometer. (
  • The ratio of charge to mass of the particles is calculated by passing them through electric and magnetic fields in an instrument called a mass spectrometer. (
  • The following example describes the operation of a spectrometer mass analyzer, which is of the sector type. (
  • Scientists at ETH Zurich have set a world record in mass spectrometry by observing the largest ever mass-to-charge ratio of over 1 Mio Dalton (MDa) using a special mass spectrometer. (
  • For mass separation, they used a time-of-flight mass spectrometer, which separates ions of different mass-to-charge ratio by their drift time through an evacuated fligh tube. (
  • Particulate samples have been introduced into a mass spectrometer ion source with a direct insertion probe thus dispensing with the extraction processes typically used in chemical characterization. (
  • Agilent Inductively Coupled Plasma Mass Spectrometer (ICP-MS) with laser ablation capability. (
  • Calibrate LTQ mass spectrometer instruments using a mixture of highly purified ionizable molecules designed for negative mode calibration. (
  • The Benchtop Mass Spectrometer is a compact versatile gas analysis system for sampling gases over a wide range of pressures, from high vacuum up to and beyond atmospheric pressure. (
  • Identify, quantify and confirm more compounds rapidly and with confidence using the Thermo Scientific Q Exactive Hybrid Quadrupole-Orbitrap Mass Spectrometer. (
  • The Hiden HPR-20 R&D specialist gas analysis system is a bench-top mass spectrometer for the monitoring of evolved gases and vapours. (
  • An extensive range of MS inlets for optimised coupling the HPR-20 EGA mass spectrometer to TGA systems is available. (
  • Inductively Coupled Plasma Mass Spectrometer (ICPMS) is a very versatile analytical instrument capable of trace and ultra-trace analysis and isotope ratio analysis in aqueous samples. (
  • Ambient ionisation is a form of ionization in which ions are formed outside the mass spectrometer without sample preparation or separation. (
  • Gas chromatography mass spectrometry (GC-MS) is an instrumental technique, comprising a gas chromatograph (GC) coupled to a mass spectrometer (MS), by which complex mixtures of chemicals may be separated, identified and quantified. (
  • A triple quadruple mass spectrometer is a tandem mass spectrometer consisting of two quadruple mass spectrometers in series, with a (non mass-resolving) radio frequency (RF) only quadruple between them to act as a collision cell for collision-induced dissociation. (
  • Compact process gas monitor using quadrupole mass spectrometer. (
  • The methods involve differing ratios of hydrolyzing agent to polymer disposed upon a reaction surface adapted for use with a mass spectrometer. (
  • The apparatus involves a mass spectrometer sample holder, having hydrolyzing agent disposed thereon, which is useful for adapting any mass spectrometer for polymer sequencing. (
  • 20. The method of claim 1 wherein said reaction surface comprises a mass spectrometer sample holder having microreaction vessels disposed thereon. (
  • 4. The apparatus of claim 3 wherein the analytical apparatus comprises a mass spectrometer. (
  • The Synapt G2S mass spectrometer is equipped with a versatile ion source front, allowing to connect several ionization sources. (
  • The ions are sampled and analyzed by the mass spectrometer after interaction with the ESI plume. (
  • A HewlettPackard 5890 Series II gas chromatograph with flame ionization detector (FID) coupled to 5972 MSD quadrupole mass spectrometer was used. (
  • See how utilizing a modern mass spectrometer can determine amino acid sequences and sequential fragmentation. (
  • Proteomics, or protein identification, employs tandem mass spectrometry (MS/MS) of proteolytically generated peptides from a biological sample using a high-resolution mass spectrometer ( e.g., the Orbitrap Fusion) coupled with liquid chromatography. (
  • This instrument combines an ion trap mass spectrometer with collision induced dissociation (CID), higher-energy collisional dissociation (HCD) and electron transfer dissociation (ETD) fragmentation techniques to produce a high resolution instrument with high mass accuracy. (
  • Secondary ions are collected and focused into a reflectron time-of-flight (TOF) mass spectrometer. (
  • A mass spectrometer consists of three components: an ion source, a mass analyzer, and a detector. (
  • Recent successes illustrate the role of mass spectrometry-based proteomics as an indispensable tool for molecular and cellular biology and for the emerging field of systems biology. (
  • Aebersold, R. & Mann, M. Mass spectrometry-based proteomics. (
  • The Proteomics facility is equipped with two state of the art mass spectrometers a LTQ Orbitrap Velos and a Fusion which were both the first of their kind in South Africa. (
  • Applications of proteomics to cell biology and biomedical research require further developments of mass spectrometry (MS) technology to overcome long-standing limitations in speed, sensitivity and robustness. (
  • It summarizes breakthroughs in the theory and instrumentation of electrospray mass spectrometry in pharmaceutical and biomedical applications, provides practical examples for the characterization of peptides, proteins, and glycoproteins, includes applications in proteomics, combinatorial chemistry, and drug characterization. (
  • The other factors that are driving the growth of the global market include the increasing use of mass spectrometry in proteomics and the increasing usage amongst emerging nations. (
  • We provide proteomics and mass spectrometry services for UK based researchers, engage in research collaborations and implement current technologies in facility services. (
  • How are proteomics services performed using mass spectrometry services? (
  • The Mass Spectrometry and Proteomics Core Facility is located in the Cannon Research Center at Carolinas Medical Center. (
  • The Mass Spectrometry and Proteomics Core Facility uses high-throughput nano flow liquid-chromatography tandem mass spectrometry to identify proteins from one dimensional or two dimensional polyacrylamide gel slices. (
  • Computational methods for mass spectrometry proteomics. (
  • In high-resolution mass spectrometry, the mass of the molecular ion can be measured to an accuracy of 4 ppm. (
  • In such an instrument, the molecular ion of 2-butanone would appear at m / z = 72.0575, which would unambiguously establish its molecular formula as C 4 H 8 O. High-resolution mass spectrometry is an excellent method for determining the molecular formulas of organic compounds . (
  • Our researchers have extensive expertise in applying high resolution mass spectrometry to identify new binding ligands to target proteins for drug discovery. (
  • The webinar provides a detailed overview of how high-resolution mass spectrometry and data acquisition using a 'catch all compound' acquisition scan mode can reduce instances of reporting false positives and negatives. (
  • Un)targeted Ambient Scanning of Locks of Hair for Drugs of Abuse using Direct Analysis in Real Time - High Resolution Mass Spectrometry. (
  • Our large molecule GMP mass spectrometry facility offers a wide variety of protein, peptide, glycoprotein, glycoconjugate, proteomic, and specialty analytical services employing Orbitrap Fusion (CID/HCD/ETD) and QTOF high resolution mass spectrometry platforms. (
  • This use is also implied by the term "high-resolution mass spectrometry. (
  • [1] Emerging technologies in the field of MSI are MALDI imaging and secondary ion mass spectrometry imaging ( SIMS imaging ). (
  • Secondary ion mass spectrometry (SIMS) is used to analyze solid surfaces and thin films by sputtering the surface with a focused primary ion beam and collecting and analyzing ejected secondary ions. (
  • Calutron mass spectrometers were used in the Manhattan Project for uranium enrichment. (
  • Sector mass spectrometers known as calutrons were developed by Ernest O. Lawrence and used for separating the isotopes of uranium during the Manhattan Project . (
  • [9] Calutron mass spectrometers were used for uranium enrichment at the Oak Ridge, Tennessee Y-12 plant established during World War II. (
  • The instruments used in such studies are called mass spectrometers and mass spectrographs , and they operate on the principle that moving ions may be deflected by electric and magnetic fields. (
  • In addition to the three mass spectrometers described below, there are areas for data processing, instrument maintenance, parts storage and sample preparation. (
  • These sophisticated mass spectrometers provide South African researchers the unique opportunity to analyse thousands of proteins in one run. (
  • The much reduced complexity of purified samples allow the use of shorter gradient times and does not require the use advanced mass spectrometers. (
  • Isotope analyses using mass spectrometers have been frequently utilized in the laboratories for the earth planetary science and other scientific and industrial fields. (
  • In order to conduct in-situ measurements of compositions and isotope ratios around planets and moons, mass spectrometers onboard spacecraft have also been developed. (
  • Ion and electron instruments on orbiters have provided much outputs for the space and planetary science since the early days and mass spectrometers on landers and rovers have recently performed isotope analyses on planetary bodies. (
  • We review spaceborne mass spectrometers, instrumentations, and observation results. (
  • Starting with spaceborne ion instruments to measure three distribution functions as well as mass for the space plasma physics, mass spectrometers have evolved to recent high-mass-resolution instruments for solar system exploration missions. (
  • Waters mass spectrometers provide you with the tools to confidently identify and quantify unknown compounds in complex samples, and confirm trace components at the lowest possible levels. (
  • H Wollnik, Ion optics in mass spectrometers. (
  • Some mass spectrometers can sit on a tabletop. (
  • The range of mass spectrometers has grown to the point where the group now has a wide range of state-of-the-art systems capable of dealing with all sample types and a wide array of client demands. (
  • The mass spectrometers are available for self use by graduate students and post-docs after training by MS Facility staff. (
  • The facility also houses high-end mass spectrometers, including single quadrupole, triple quadrupole, high resolution, MALDI and time of flight instruments. (
  • Calibrate LTQ Velos, LTQ Orbitrap and other mass spectrometers using a mixture of highly purified ionizable molecules designed for positive mode calibration. (
  • Calibrate LTQ, LTQ Orbitrap, LXQ and LCQ FLEET mass spectrometers using a mixture of highly purified ionizable molecules designed for positive mode calibration. (
  • Calibrate Triple Stage Quadrupole (TSQ) mass spectrometers using a mixture of high purity, ionizable components specifically designed for positive mode calibration. (
  • Various orbitrap instruments, including the commercially available linear ion trap-orbitrap hybrid mass spectrometers, are also discussed with emphasis on the different methods used to inject ions into the trap. (
  • Keele has invested in a variety of mass spectrometers with complementary analytical capabilities, together with HPLC equipment to provide upstream separation for enhanced sensitivity and automation. (
  • The Mass Spectrometry Center provides a suite of state-of-the-art instrumentation to UMass researchers with a broad range from applications, from biologically-derived samples through small molecules and synthetic polymers. (
  • An in-depth treatment of modern mass spectrometry, instrumentation, and techniques with discussion of biological and chemical applications. (
  • This application claims the benefit of U.S. Provisional Application No. 61/146,243, entitled "DOWNHOLE MASS SPECTROMETRY INSTRUMENTATION," filed Jan. 21, 2009, the entire disclosure of which is hereby incorporated herein by reference. (
  • summarizes the most recent breakthroughs in the theory and instrumentation of electrospray mass spectrometry. (
  • Intertek Whitehouse offers advanced capabilities in the field of mass spectrometry using instrumentation able to support both regulated and non-regulated activities including pharmaceutical, food, cosmetic and chemical applications. (
  • It is the first book to systemically cover the theoretical background, techniques, instrumentation, and practical applications of planar chromatography-mass spectrometry as a hyphenated tool of analytical chemistry. (
  • Our experience managing complex mass spectrometry projects combined with our state-of-the-art instrumentation and infrastructure allows us to deliver high quality GMP structural characterization and proteomic analytical services. (
  • The current mass spectrometry instrumentation includes an LTQ-XL and a TSQ Quantum Ultra, both with acquity UPLC systems, and an LTQ-XL Orbitrap-ETD with nano acquity UPLC. (
  • The Clinical Mass Spectrometry (CMS) facility in the Division of Pathology and Laboratory Medicine provides a wide range of assays for endogenous compounds and metabolites, natural and medicinal products, novel drugs under development, therapeutic drug monitoring, detection of drugs of abuse (including opioids), comprehensive lipidomics / metabolomics analyses, and diagnoses of genetic disorders in metabolism. (
  • The Clinical Mass Spectrometry (CMS) Laboratory of the Division of Pathology and Laboratory Medicine is located on the main campus of Cincinnati Children's Hospital, in Research Building Location R, rooms R025 - R034. (
  • Clinical mass spectrometry plays a vital role in the drug discovery pipeline for the development of personalized medicines. (
  • The Global Clinical Mass Spectrometry Market analysis report covers detailed value chain analysis of Global Clinical Mass Spectrometry Market. (
  • The Global Clinical Mass Spectrometry Market report explores manufacturer's competitive scenario and provides market share for all major players of this market based on production capacity, sales, revenue, geographical presence and other major factors. (
  • The report "Mass Spectrometry Market - by Technology (Tandem LC-MS/Quadrupole/ICP-MS/Gas Chromatography - MS/TOF-MS/MALDI-TOF/Fourier Transform-MS) & by Application (Pharmaceutical/Biotechnology/Environment/Food & Beverages) - Global Trends & Forecast to 2018" , this report studies the global mass spectrometry market over the forecast period of 2013 to 2018. (
  • The mass spectrometry facility has finished moving to NHB! (
  • Our Mass Spectrometry Facility runs over 20,000 samples every year! (
  • Our facility offers support for the analysis of a wide variety of analytes using mass spectrometry based techniques. (
  • MSF Closed 12/22/17 - 1/1/18 The Mass Spectrometry Facility will be closed from December 22nd to January 1st. (
  • The mass spectrometry facility is housed in a 1000 sq ft laboratory located in the UMSL Research Building (R003). (
  • Don't hesitate to contact us for more information on our Mass Spectrometry screening services - please get in touch with Mass Spectrometry Facility Manager Dr Wendy Loa or GRIDD Strategic Development Manager Dr Raya Monteiro with your inquiry. (
  • The Louisiana State University Mass Spectrometry Facility provides analytical support for the Chemistry Department and other academic departments at LSU, researchers at other universities, and customers from private industry. (
  • The Mass Spectrometry Facility provides mass spectrometry analysis to researchers, and assists in the development and analysis of mass spectrometry experiments. (
  • The Mass Spectrometry Facility is able to do a variety of analyses, please contact Dr. Dyanne Brewer for further details. (
  • This state of the art facility, situated within the La Trobe Institute for Molecular Science (LIMS) offers a comprehensive range of different types of mass spectrometry equipment. (
  • The following mass spectrometry instruments are available at the Whitehouse facility. (
  • The department's Mass Spectrometry Facility currently has 3 instruments, consisting of an LC-MS system and two GC-MS systems. (
  • The Separation Science and Mass Spectrometry Facility houses a range of modern chromatography and mass spectrometry equipment which support research and teaching in analytical chemistry at RMIT. (
  • The Mass Spectrometry Facility at Keele University is run in collaboration with Guy Hilton Research Centre (GHRC) and the Robert Jones and Agnes Hunt Orthopaedic Hospital (RJAH) in Oswestry. (
  • Results are displayed as spectra of the signal intensity of detected ions as a function of the mass-to-charge ratio. (
  • the primary ion beam is emitted across the sample while secondary mass spectra are recorded. (
  • However, if the analyte being tested has a low mass value then it can produce a similar looking spectra to that of a MALDI spectra. (
  • Mass spectra of literally hundreds of compounds, among them complex carbohydrates, a variety of organometallics, synthetic polyamides as well as complex alkaloids and other natural products, have been obtained using one of the afore mentioned ionization methods. (
  • These first nanoelectromechanical system-mass spectrometry spectra, obtained with modest mass sensitivity from only several hundred mass adsorption events, presage the future capabilities of this approach. (
  • In the Open Mass Spectrometry Search Algorithm (OMSSA), specificity is calculated by a classic probability score using an explicit model for matching experimental spectra to sequences. (
  • With technologies like QuanTof (for a new dimension in high-resolution exact mass MS), StepWave (for confirmation of trace components), Triwave (for characterization of complex mixtures), and MS E (for exact-mass ion spectra from your samples), your possibilities are endless. (
  • In this way, simple and directly interpretable mass spectra were obtained from immunoglobuline M (ca. 1 MDa) and from von Willebrand factor, a group of proteins that play an important role in coagulation of blood (signals at 0.5, 1, 1.5 and 2 MDa). (
  • Typical mass spectra are presented for each operating condition. (
  • The Ambient Mass Spectrometry Imaging system can image sample surfaces under ambient native conditions, without sample preparation, and generate accurate localized mass spectra. (
  • After tissue sectioning and transfer onto a conductive and transparent sample plate, the MALDI matrix is deposited, and data are acquired by recording mass spectra according to a raster of points covering the surface to be analyzed. (
  • Mass spectra recorded with their coordinates on the tissue are processed, and molecular images of the localization of molecules can be reconstructed. (
  • We offer a range of the most commonly used Mass Spectrometry standards needed for standardizing your mass spectra. (
  • Interpretation of mass spectra. (
  • Inductively Coupled Plasma-Mass Spectrometry (ICP) is a powerful technique of chemical characterization capable of simultaneously measuring up to 50 different trace elements, sometimes at concentrations as low as several parts per billion. (
  • With a proven track record of success in the biopharmaceutical industry, it analyzes mass spectrometry data for a variety of tasks related to protein characterization, such as identification and quantification of Post Translational Modifications (PTMs). (
  • Mass spectrometry (MS) offers unmatched capabilities for the detection, characterization, and identification of a broad range of analytes. (
  • C. Cremers and D. Bayer, "Differential electrochemical mass spectrometry (DEMS) technique for direct alcohol fuel cell characterization," in Polymer Electrolyte Membrane and Direct Methanol Fuel Cell Technology , C. Hartnig and C. Roth, Eds. (
  • Intertek Allentown has many years of experience in developing liquid chromatography mass spectrometry (LCMS) applications for solving a variety of characterization needs and problem resolution. (
  • Ambient Characterization of Synthetic Fibers by Laser Ablation Electrospray Ionization Mass Spectrometry. (
  • With over 20 years of experience in mass spectrometry services, we have a proven track record supporting diverse protein characterization programs including large molecule comparability studies. (
  • P Price: Standard definitions of terms relating to mass spectrometry: A report from the Committee on Measurements and Standards of the American Society for Mass Spectrometry. (
  • Our Inductively Coupled Plasma Mass Spectrometry (ICP-MS) Laboratory operates around a new Thermo ICAP Q quadrupole ICP-MS and a New Wave UP213 laser ablation system for solid sample introduction. (
  • The Teledyne CETAC Aridus3 Desolvating Nebulizer System is a specialized liquid sample introduction accessory for inductively coupled plasma mass spectrometry (ICPâ€'MS). The Aridus3 can enhance analyte sensitivity up to 10 times or more and can greatly reduce solvent-based interferences such as oxides and hydrides. (
  • Inductively Coupled Plasma Mass Spectrometry (ICP-MS) features microscale(10-6(, trace(10-9(, and ultratrace(10-12( element analysis techniques. (
  • Mass spectrometry imaging (MSI) (also known as imaging mass spectrometry) is a technique used in mass spectrometry to visualize the spatial distribution of chemical compositions e.g. compounds, biomarkers , metabolites , peptides or proteins by their molecular masses. (
  • Imaging Mass Spectrometry: An Overview presented by Michelle L. Reyzer (Vanderbilt University) and Demian R. Ifa (York University) on November 8, 2013. (
  • Tandem Quadrupole ( Triple Quadrupole ) Mass Spectrometry Waters innovative tandem quadrupole MS technology is designed for quantitative UPLC®-MS/MS. Our philosophy centers on making high performance accessible, robust and reliable. (
  • Increasingly, tandem mass spectrometry (MS/MS) is being used for newborn screening because this laboratory testing technology substantially increases the number of metabolic disorders that can be detected from dried blood-spot specimens. (
  • The introduction of tandem mass spectrometry (MS/MS) in the 1990s for population-based newborn screening has enabled health-care providers to detect an increased number of metabolic disorders in a single process by using dried blood-spot specimens routinely collected from newborns ( 13 ). (
  • Application of tandem mass spectrometry for species identification is illustrated. (
  • A liquid chromatography-tandem mass spectrometry multiresidue method for quantification of specific metabolites of organophosphorous pesticides, synthetic pyrethroids, selected herbicides, and DEET in human urine. (
  • Tandem Mass Spectrometry or MS/MS presented by Scott A. McLuckey (Purdue University) on June 14, 2014. (
  • Resulting peptides are extracted from the gel matrix and analyzed using reversed phase nano-litter flow liquid chromatography followed by tandem mass spectrometry. (
  • With our three staff operated instruments, we provide services for molecular formula confirmation (accurate mass measurement), structural elucidation (MS/MS) and quantitation of small molecules. (
  • Mass spectrometry differs from the types of spectroscopy previously discussed because the molecular information that the technique provides does not depend on absorption of electromagnetic radiation. (
  • From the masses and abundance of the peaks in a mass spectrum, it is often possible to determine the exact mass of the molecule being analyzed and to obtain clues about molecular structure. (
  • Mass spectrometry can be used to analyze the molecular structure of organic compounds such as 2-butanone. (
  • The mass analyzer contains a strong magnetic field , through which the molecular ions must pass. (
  • The peak at m / z = 72 is the molecular ion and as such gives the molecular mass of the molecule. (
  • Valuable information about molecular structure also can be obtained from the mass of the fragments present in the mass spectrum. (
  • High-Mass option facilities, easier characterisation of high-molecular weight species and native state protein complexes. (
  • GRIDD provides high-resolution mass measurement to determine the molecular formula of chemical entities as a service for Griffith researchers and external organisations. (
  • Nanoelectromechanical systems provide unparalleled mass sensitivity, which is now sufficient for the detection of individual molecular species in real time. (
  • Mass Spectrometry Imaging Bringing together the powerful technologies of MALDI and DESI to discover, identify, and measure a broad range of molecular targets, delivering multi-layered, information-rich data from a single sample. (
  • Due to its structurally significant mass spectral peaks, extended range of analyzable low volatility samples, enhanced molecular ions, and valuable isotope ratio information, GC-MS is a powerful tool for geochemical applications. (
  • Identify unknown components by screening their accurate mass and/or predicted molecular formula against the local PubChem database. (
  • In this issue of Clinical Chemistry, Muddiman and coworkers from the Mayo Clinic present reports in which two levels of mass spectrometry experiments are used to detect and characterize transthyretin variants by accurately measuring the molecular mass of the intact protein isolated from human serum (1, 2). (
  • It covers electrophoretic-mass spectrometry methods and applications, which are considered planar chromatographic techniques and are increasingly being exploited in proteomic and molecular biology studies as well as for medical diagnostic purposes. (
  • We used ESI-MS =-=(17)-=- to measure the potential zinc ion binding of SAG by comparing the molecular mass of SAG under denaturing and nondenaturing solution conditions (37, 72). (
  • We are using the ESI-MS modification preferentially for proteins and peptides of low molecular mass th. (
  • Ten years' evolution from one of the first MALDI images presented in 1999 at the 47th ASMS Conference on Mass Spectrometry and Allied Topics ( left ) (reprinted with permission of Caprioli and co-workers (84)) and molecular images obtained by our group for mouse stem cells injected in brain tissue sections ( right ) (M. Wisztorski, C. Meriaux, M. Salzet, and I. Fournier, unpublished results). (
  • Mass species representing molecular features of preinvasive and invasive lesions of the breast. (
  • Molecular weight, or molecular mass, is the total mass of a molecule based on the atomic masses of its individual atoms. (
  • By providing mass determination with low measurement errors (parts per million, ppm), mass spectrometry enables precise determination of molecular composition. (
  • Performs mass analysis to determine the elemental or molecular composition (or both) of the top monolayer of a material's surface. (
  • Our research focuses on the development and application of mass spectrometry and ion mobility spectrometry techniques to elucidate the structures and assembly of protein complexes and subcellular machines. (
  • Ion mobility spectrometry (IMS-MS) is an analytical technique used to separate and identify ions in the gas phase based on their ion mobility in a buffer gas and detect via a mass detector. (
  • High resolution indicating better peak separation is also used in ion mobility spectrometry. (
  • Ion mobility spectrometry. (
  • Open mass spectrometry search algorithm. (
  • Search for different tests available through the Mass Spectrometry (CMS) Laboratory. (
  • We provide fully assisted Mass Spectrometry services at highly competitive rates. (
  • Mass spectrometry provides rapid and quantitative identification of protein species with relatively low sample consumption. (
  • The Mass Spectrometry Unit performs quantitative and qualitative analysis of organic molecules using Mass spectrometry. (
  • Time-of-flight Mass Spectrometry Waters Time-of-flight MS systems, featuring QuanTof and MS E technologies, provide the highest UPLC-MS performance to meet the needs of challenging qualitative and quantitative applications. (
  • Mass Spectrometry for Quantitation Quantitative mass spectrometry in an analytical process that answers the important question of 'How much is in my sample? (
  • The workshop brought together researchers, practitioners and laboratory managers from industry, academia, and government to present new results, discuss recent trends, and identify important problems in the area of quantitative mass spectrometry of synthetic polymers. (
  • Quantitative synthetic polymer mass spectrometry workshop. (
  • We develop proteomic tools for dissecting cellular function, with a special emphasis on the mass spectrometry (MS) of peptides and proteins. (
  • The ability of mass spectrometry to identify and, increasingly, to precisely quantify thousands of proteins from complex samples can be expected to impact broadly on biology and medicine. (
  • These high-resolution electrospray ionisation mass spectrometry instruments support a range of research projects focused on the study of proteins and complexes of protein with fragments, compounds and natural product extracts, known as bioaffinity mass spectrometry. (
  • Capture, concentrate and desalt 10 to 100 microliter samples of peptides and proteins for MALDI mass spectrometry with these ready-to-use pipette-tip columns of C18 resin. (
  • It is also useful for analysis of high mass species that form multiply charged ions with ESI (such as proteins, peptides) due to the post-acquisition de-convolution capability of the operating software. (
  • Mass-spectrometry based Reference Methods, well established for small molecules as glucose, cholesterol or steroid hormones, have not been available, until recently, for quantification of proteins. (
  • One present study is about mass spectrometric quantification of viral proteins. (
  • It is spectrometry based on the mass or weight of the proteins. (
  • Based on the weight of monoclonal proteins, e.g. lambda or kappa, their mass can be distinguished in a very specific way - in a number of daltons, which is the expression of the weight. (
  • The Mass Spectrometry Shared Resource provides services to elucidate the primary structure of novel proteins and to analyze protein/protein interactions, post-translational modifications and protein levels. (
  • The Expanding Role of Mass Spectrometry in Biotechnology, Second Edition. (
  • Predict mass fragmentation in seconds with ACD/MS Fragmenter. (
  • A brief description of electron-ionization mass spectrometry, widely used for the analysis of relatively small molecules, illustrates the general principles. (
  • The principles behind mass spectrometry are somewhat abstract, so let's start with a concrete mental exercise. (
  • Contributors from pharmaceuticals, biochemistry, and other biomedical disciplines review and illustrate the principles and applications of using mass spectrometry to study biomolecular interactions. (
  • Mass spectrometry imaging (MSI) integrates MS data with information on the spatial distributions of the analytes, further enhancing the applicability of MS. In Mass Spectrometry Imaging: Principles and Protocols, expert practitioners from academia, industry, and the clinic contribute cutting-edge protocols describing the application of MSI to investigations of analyte localization in a variety of specimens, from microorganisms to plant and animal tissues. (
  • Comprehensive and up-to-date, Mass Spectrometry Imaging: Principles and Protocols is written for scientists, biological and chemical engineers, and clinicians who are interested in applying MSI in their work and those who would benefit from having detailed experimental guidelines available in a single, convenient source. (
  • Mass spectrometry: principles and applications. (
  • 15 synthetic heavy peptides mixed in equimolar ratio to test and calibrate reverse-phase liquid chromatography (LC) and mass spectrometry (LC-MS) equipment. (
  • Peptide mapping is used to confirm protein primary structure by determining its amino acid sequence and employing endoproteases (enzymes) to generate peptides, followed by analysis by HPLC coupled with mass spectrometry. (
  • In this study, multidimensional separations were coupled with mass spectrometry to detect and sequence mixtures of model proto-peptides. (
  • Whereas the majority of studies in the field focus on peptides containing only one or two types of amino acids, here we used modern mass spectrometry (MS)-based techniques to separate and sequence de novo proto-peptides containing broader combinations of prebiotically plausible monomers. (
  • As an initiative of the ASMS Diversity Committee, JASMS editors are pleased to share the "Faces of Mass Spectrometry" interview series. (
  • We welcome nominations (and self-nominations) of members to profile in the Faces of Mass Spectrometry. (
  • As part of the nomination we request a 300 word (max) statement to tell us 'Why this person be highlighted in the Faces of Mass Spectrometry and/or How does this person represent diversity in the ASMS? (
  • As an initiative of the recently formed ASMS Diversity and Outreach Working Group, the editors are pleased to introduce a new "Faces of Mass Spectrometry" interview series in the Journal of the American Society of Mass Spectrometry. (
  • The technological advancements and breakthroughs in the field of mass spectrometry such as increased speed, higher accuracy, improved resolution, and miniaturization are expected to drive the global market in the coming years. (
  • The Mass Spectrometry Data Center measures, compiles, evaluates, and correlates Standard Reference Data and develops and disseminates associated electronic databases and analysis software for industrially and environmentally important (bio)molecules. (
  • The services are provided with full "beginning-to-end" support that includes project evaluation and design, biochemical purifications, mass spectrometry sequencing, and data analysis performed within the core and by the experienced core personnel. (
  • The trend towards biological analysis at increasingly smaller scales, ultimately down to the volume of an individual cell, continues, and mass spectrometry with a sensitivity of a few to single molecules will be necessary. (
  • Domon, B. & Aebersold, R. Mass spectrometry and protein analysis. (
  • Services include GC-MS analysis, LC-MS analysis, accurate mass determinations and Proteomic analysis. (
  • During the past ten years a variety of methods involving mass spectrom- etry have been developed for the analysis of environmentally important compounds. (
  • How to get the most out of your mass spectrometry analysis. (
  • The Genedata session at the Biotherapeutics Analytical Summit will demonstrate how leading pharmaceutical companies have successfully automated the analysis of mass spectrometry data for site-specific glycosylation of biopharmaceuticals. (
  • Genedata Expressionist for Mass Spectrometry Poster Session: Bioanalytical Mass Spectrometry application for sequence identification, quantifying PTMs, intact protein, and host cell protein impurity analysis. (
  • ACD/Labs' mass spectrometry software offers a range of options, from routine to advanced packages, for ensuring efficient and effective MS data handling and analysis for small molecules. (
  • Means of delivering nonvolatile analytes into the gas phase for mass analysis. (
  • Ambient ionization mass spectrometric analysis of human surgical specimens to distinguish renal cell carcinoma from healthy renal tissue. (
  • Planar Chromatography-Mass Spectrometry focuses on a relatively new approach to chemical analysis in general, and to separation science in particular. (
  • Use this standard, a highly validated mammalian protein digest, as a quality control sample for mass spectrometry (MS) analysis of complex proteomic samples. (
  • Calibrate and maintain quality control for liquid chromatography (LC) and mass spectrometry (MS) analysis of proteomic samples using the carefully validated Thermo Scientific™ Pierce™ BSA Protein Digest Standard, LC-MS Grade. (
  • Separation of complex mixtures using hyphenated techniques e.g. ion mobility mass spectrometry, gas chromatography, ultra-high pressure liquid chromatography, direct analysis in real-time ionisation. (
  • Each chapter provides guidance in using the appropriate methods for isolating and purifying the compound class prior to mass spectrometric analysis. (
  • The methods further involve integrating data obtained from mass spectrometry analysis of a plurality of series of hydrolyzed polymer fragments, and optionally provide statistical interpretation paradigms and computer software therefor. (
  • 19. The method of claim 1 wherein step (c) is accomplished using mass analysis modes selected from the group consisting of: time-of-flight, quadrapole, ion trap, and sector. (
  • A method apparatus wherein a plurality of electric fields and of orthogonal spray configurations of vaporized analyte are so combined as to enhance the efficiency of analyte detection and mass analysis. (
  • Ambient mass spectrometry imaging is a very new development and has already a wide range of application, especially in qualitative surface analysis. (
  • Macroscopic and microscopic spatially-resolved analysis of food contaminants and constituents using laser-ablation electrospray ionization mass spectrometry imaging. (
  • g , specific MALDI imaging analysis using the Tag-mass concept with anti-C-terminal REG-α and an anti-human IgG tag (reporter m/z 1309) and anti-orosomucoid and anti-human monoclonal antibody (reporter m/z 1569). (
  • There is disclosed an apparatus for providing an ionized analyte for mass analysis by photon desorption comprising at least one layer (11) for contacting an analyte, and a substrate (10) on which said layer (11) is deposited. (
  • Upon irradiation of said app aratus, said analyte desorbs and ionizes for analysis by mass spectrometry. (
  • a substrate on which said layer is deposited, wherein said analyte upon irradiation of said apparatus with a photon source desorbs and ionizes for mass analysis. (
  • Mass spectrometry ( MS ) is an analytical technique that is used to measure the mass-to-charge ratio of ions . (
  • These ions (fragments) are then separated according to their mass-to-charge ratio, for example by accelerating them and subjecting them to an electric or magnetic field: ions of the same mass-to-charge ratio will undergo the same amount of deflection. (
  • [2] [3] Early spectrometry devices that measured the mass-to-charge ratio of ions were called mass spectrographs which consisted of instruments that recorded a spectrum of mass values on a photographic plate . (
  • [4] [5] A mass spectroscope is similar to a mass spectrograph except that the beam of ions is directed onto a phosphor screen. (
  • Mass spectrometry , also called mass spectroscopy , analytic technique by which chemical substances are identified by the sorting of gaseous ions in electric and magnetic fields according to their mass-to-charge ratios . (
  • As the ions pass through the magnetic field, they are deflected into a curved path that is dependent on both their charge and mass. (
  • Ions of different mass travel along a different trajectory before reaching a detector, which records the intensities and masses of the ions that strike it. (
  • A method comprising using a first mass analyzer of a downhole tool to isolate specific ions within a sample received in the downhole tool, using a second mass analyzer of the downhole tool to stabilize the ions isolated by the first mass analyzer, and using a third mass analyzer of the downhole tool to catalog the stabilized ions. (
  • and using a third mass analyzer of the downhole tool to catalog the stabilized ions. (
  • Sodium atoms and ions are monoisotopic , with a mass of about 23 amu. (
  • Has a mass range for singly charged ions of 10-2000 Daltons with unit resolution across the entire mass range. (
  • One possibility would be to produce multiply charged ions and detect them in a more accessible mass-to-charge ratio range. (
  • Time-of-flight mass spectrometry (TOF-MS) is a method of mass spectrometry in which ions mass-to-charge ratio is determined via a time measurement. (
  • Rapid (ms) separation of ions based on shape, mass and charge. (
  • The invention relates to a method and apparatus for obtaining improved signal relative to noise without loss of ion collection efficiency for use in mass spectrometry, including LC/MS (liquid chromatography/mass spectrometry), especially as regards the technique of generating analyte ions known as Atmospheric Pressure Chemical Ionization (APCI). (
  • An extraction system removes ions from the sample, which are then targeted through the mass analyzer and into the detector. (
  • The differences in masses of the fragments allows the mass analyzer to sort the ions by their mass-to-charge ratio. (
  • [7] The use of the term mass spectroscopy is now discouraged due to the possibility of confusion with light spectroscopy . (
  • The foundation of mass spectroscopy was laid in 1898, when Wilhelm Wien, a German physicist, discovered that beams of charged particles could be deflected by a magnetic field . (
  • Advanced prediction, processing, and interpretation software for mass spectroscopy techniques. (
  • Mass spectroscopes also are employed to separate isotopes and to measure the abundance of concentrated isotopes when used as tracers in chemistry , biology, and medicine . (
  • This article will walk you through the unassuming but handy field of chemistry known as mass spectrometry . (
  • Practical MS Education Package This package contains all the materials and equipment needed to introduce a practical course in MS fundamentals in which your organic chemistry students will have the opportunity to generate and interpret mass data themselves. (
  • The Mass Spectrometry Group in the School of Chemistry at the University of Southampton was established in 1988 and has a research history including work in the early days of Fullerenes with the Sussex Group, introduction of the first open access MS system to academia, combichem, and applications in DNA research. (
  • The journal invites papers in all fundamental aspects of mass spectrometry and ion processes , including instrumental developments and applications in biology , chemistry , geology and physics . (
  • The American Association for Clinical Chemistry (AACC), states that the greater specificity of liquid chromatography-mass spectrometry-(LC MS) enables the measuring of testosterone for patients with low endogenous concentrations. (
  • Some mass spectrometrists use the definition that is similar to definitions used in some other fields of physics and chemistry. (
  • Mass spectrometry is used in many different fields and is applied to pure samples as well as complex mixtures. (
  • This book overviews the combination of planar chromatography, a relatively simple and cost-effective separation step for determining complex mixtures of compounds, with mass spectrometry, an efficient, highly instrumental, and relatively expensive technique that enables rapid identification of separated chemical species. (
  • These capabilities include advanced sample preparation combined with both LC-MS and GC-MS. High resolution accurate mass (HRAM) hyphenated with both GC and LC separation, enhanced-resolution triple quadrupole hyphenated with GC instrument and triple quadrupole LC systems for routine quantitation. (
  • Obtain both positive and negative ionization calibration of Thermo Scientific™ Triple Stage Quadrupole instruments using the Thermo Scientific™ Pierce™ Triple Quadrupole Calibration Solution, Extended Mass Range, which is a mixture of 14 highly pure, ionizable components (mass range: 69 m/z to 2800m/z). (
  • The Quantum is a triple quadrupole instrument with high sensitivity and a broad mass range. (
  • Gas chromatography-mass spectrometry (GC-MS) is a hybrid analytical technique that couples the separation capabilities of GC with the detection properties of MS to provide a higher efficiency of sample analyses. (
  • Mass spectrometry is an analytical technique that identifies the chemical composition of a compound or sample based on the mass-to-charge ratio of charged particles. (
  • Matrix-assisted laser desorption ionization can be used as a mass spectrometry imaging technique for relatively large molecules. (
  • With origins in basic research, mass spectrometry emerged as a clinical research tool when it was first applied to fingerprint molecules for drug screening in the fight against drugs of abuse. (
  • 3. The apparatus of claim 2 wherein the analytical apparatus is capable of detecting and measuring the mass and charge of ionized molecules which have been communicated from the second passageway exit into the analytical apparatus. (
  • In our nanoelectromechanical-mass spectrometry system, nanoparticles and protein species are introduced by electrospray injection from the fluid phase in ambient conditions into vacuum, and are subsequently delivered to the nanoelectromechanical system detector by hexapole ion optics. (
  • Therefore, PTB has developed Isotope Dilution Mass Spectrometry (ID-MS) for protein markers, expanding the scope of SI-traceable Reference Measurement to this important class of clinical measurands. (
  • Mass spectrometric protein quantification is used to explore measurands for research purposes in general. (
  • Mass spectrometry services are critical to protein therapeutics in all stages of development from pre-clinical to licensure. (
  • The Thermo Scientific Exactive GC (HRAM with 60,000 resolution and sub ppm mass accuracy, CI capability without vacuum venting) with SPME, static headspace (SHS) and multiple liquid injection capabilities supports component identification, elemental composition confirmation and MS quantitation. (
  • Etalo D, de Vos RCH, Joosten MHAJ, Hall RD. Spatially-resolved plant metabolomics: some potentials and limitations of Laser-Ablation Electrospray Ionization (LAESI) Mass Spectrometry metabolite imaging. (
  • The ion of mass 22 was, in fact, a stable heavy isotope of neon. (
  • So, when you do mass spectrometry, you get two signals of different intensities depending on the natural abundance of each isotope. (
  • This series of rapid acquisitions has positioned GV Instruments to be a major player in inorganic mass spectrometry , especially isotope ratio mass spectrometry (ISMS). (
  • Mass spectrometry - finds the mass of molecule/isotope by measuring mass-to-charge ratio. (
  • Touch spray-mass spectrometry (TS-MS) is an ambient ionization technique (ionization of unprocessed samples in the open air) that may find intraoperative applications in quickly identifying the disease state of cancerous tissues and in defining surgical margins. (
  • Diagnosis of prostate cancer by desorption electrospray ionization mass spectrometric imaging of small metabolites and lipids. (
  • We performed desorption electrospray ionization mass spectrometry imaging (DESI-MSI) on 54 banked human cancerous and normal prostate tissue specimens to investigate the spatial distribution of a wide variety of small metabolites, carbohydrates, and lipids. (
  • As an undergraduate student researcher in the Bush Lab, Evan investigated fundamental aspects of electrospray ionization in the context of native mass spectrometry. (
  • Biological tissues and aqueous samples are readily analyzed using a mid-infrared laser (2940 nm) in Laser Ablation Electrospray Ionization Mass Spectrometry (or LAESI-MS). The wavelength corresponds to the frequency of the O-H bond vibrations in water, therefore it results in the strong absorption of this wavelength by the water. (
  • Ionization methods in organic mass spectrometry. (
  • 24 October 2011 - UK pharmaceutical company Almac Group Ltd announced it had established a mass spectrometry laboratory at its headquarters in Northern Ireland worth GBP1m (USD1. (
  • Techniques to detect such compounds already exist, but these methods, such as mass spectrometry, are mostly confined to the laboratory because they are too bulky and complex to provide real-time, portable detection. (
  • In Mass Spectrometry of Glycoproteins: Methods and Protocols, expert researchers in the field detail many of the methods that are now commonly used for glycoproteomics. (
  • Authoritative and practical, Mass Spectrometry of Glycoproteins: Methods and Protocol is an essential resource for those who work at the interface of glycobiology and mass spectrometry. (
  • Aiming to improve power and efficiency when other analytical methods are inadequate, Planar Chromatography-Mass Spectrometry encourages separation science practitioners in academia and industry to combine the two methods for enhanced results. (
  • This unusual text is not simply a compilation of mass spectrometric methods but provides, instead, insight into specific approaches mass spectroscopists use when applying the technique to a variety of biological problems. (
  • The methods and apparatus disclosed herein are useful for sequencing polymers using mass spectrometry. (
  • The positively charged fragments (which for simplicity are considered here to bear only a single positive charge) are then accelerated by an electric field and directed into a mass analyzer. (
  • This system (installed end 2015) combines a state-of-the-art segmented quadrupole for high-performance precursor ion selection with a high-resolution, accurate-mass (HR/AM) ultra-high-field Orbitrap mass analyzer to deliver a superior combination of scan speed, resolving power, mass accuracy, spectral quality and sensitivity. (
  • Since its introduction, the orbitrap has proven to be a robust mass analyzer that can routinely deliver high resolving power and mass accuracy. (
  • The large mass range of the TOF analyzer makes the instrument well suited for detecting trace levels of organic contaminants on surfaces. (
  • Precipitous frequency shifts, proportional to the mass, are recorded in real time as analytes adsorb, one by one, onto a phase-locked, ultrahigh-frequency nanoelectromechanical resonator. (
  • The presentation will give a current overview of label-free high-throughput MALDI TOF mass spectrometry and its use in drug discovery screening. (
  • It will explain the basics of MALDI TOF mass spectrometry and the benefits of label-free screening compared to current labeled approaches. (
  • The improved ultrafast, 2-μm-pore MCP TOF detector offered by Burle Electro-Optics Inc. is suitable for mass spectrometry applications. (
  • Here, we report the first demonstration of mass spectrometry based on single biological molecule detection with a nanoelectromechanical system. (
  • Figure 2: Real-time records of single-molecule adsorption events on a NEMS mass sensor. (
  • Mass spectrometry is a highly-specific and sensitive technique for the determination of the chemical structure and quantification of compounds based on ionizing and breaking down the molecule into specific fragments. (
  • ACD/Labs' Mass Spectrometry software offers efficient and effective ways to handle small molecule MS data from routine processing, advanced processing, and interpretation to databasing and reporting. (
  • Mass Analyzers presented by Richard Vachet (University of Massachusetts Amherst) on June 9, 2013. (
  • A simulation of Chlorine isotopes along with an average atomic mass calculation is included. (
  • Using this technique has resulted in an increase of sensitivity for larger mass samples. (
  • Accurate mass measurements to determine elemental composition, high sensitivity MS and MS/MS measurements. (
  • Figures of merit such as resolving power, mass accuracy, dynamic range and sensitivity of each type of instrument are compared. (
  • with appropriate calibration compounds, mass determination to several thousand Da can be routine. (
  • This permits compounds to be assigned to the Δ 4 or Δ 5 series on the basis of mass-spectrometric data. (
  • The volatile compounds in Roselle extract and dried samples were performed using needles of solid phase microextraction (SPME) and gas chromatography/mass spectrometry (GC/MS HP-5890). (
  • Dr. Mikhael feels that screening studies, such as iStopMM , will use mass spectrometry to allow for researchers to better understand the biology of the disease and be able to detect myeloma at lower levels. (
  • Single Quadrupole Mass Detection Waters innovative single quadrupole mass detectors are designed for robustness, to make access to mass spectral data easy for scientists with all levels of expertise. (
  • This benchtop LC-MS/MS system combines quadruple precursor ion selection with high-resolution, accurate-mass (HRAM) Orbitrap detection to deliver exceptional performance and versatility. (
  • Mass spectrometry, with its inherently high selectivity, has the promise to furnish much better resolution and is being investigated as a tool for detection and evaluation of isoforms. (
  • The Mass Spectrometry Unit, part of the Central Analytical Facilities of Stellenbosch University, serves as a resource offering contemporary mass spectrometric techniques and the 'state-of-the-art' instrumen-tation needed for the diversity of research interests on- and off-campus. (
  • Below is a brief overview of the major mass spectrometric applications we currently support. (
  • We perform research-based mass spectrometric (MS) and high-throughput (HTS) analyses for SINTEF, academia and industry. (
  • There are several ways to define the minimum peak separation ΔM in mass spectrometry, therefore it is important to report the method used to determine mass resolution when reporting its value. (
  • The Warwick Mass Spectrometry community includes scientists with a wide range of technical and applications expertise. (
  • This report covers the definition, description, and forecast of the mass spectrometry market in terms of technologies and applications. (
  • Mass Spectrometry: Organic Chemical Applications. (