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Flame IonizationGas Chromatography-Mass SpectrometryChromatography, GasMass SpectrometryN,N-DimethyltryptamineChromatography, LiquidChromatography, High Pressure LiquidSpectrometry, Mass, Electrospray IonizationVolatile Organic CompoundsSolid Phase MicroextractionMetabolomicsTandem Mass SpectrometryMetabolomePerianal GlandsOils, VolatileVolatilizationChromatography, Thin LayerOcimum basilicumSubstance Abuse DetectionAndrostenediolsSpectrometry, Mass, Matrix-Assisted Laser Desorption-IonizationAcetic AnhydridesMeconiumDeuteriumMagnetic Resonance SpectroscopyDoping in SportsF2-IsoprostanesFatty AcidsSensitivity and SpecificityReproducibility of ResultsBiotransformationCarboxylic AcidsGasesHydroxyeicosatetraenoic AcidsMolecular Sequence DataUrinalysisOxidation-ReductionQuality ControlMolecular StructureEstersLimit of DetectionSteroidsCarbohydrate SequenceMethylationCarbohydrate ConformationWater Pollutants, ChemicalLipoxygenaseStereoisomerismPolycyclic Hydrocarbons, AromaticChemistryProteomicsChemical PhenomenaHydrolysisArachidonic AcidsArachidonic AcidTime FactorsBiological MarkersCalibrationCattleLiverFatty Acids, UnsaturatedDinoprostCytochrome P-450 Enzyme SystemKineticsAmino Acid SequenceHexanesReference StandardsChromatography, AffinityChromatography, Ion ExchangeProteomeIsotope LabelingEucommiaceaeChromatographyLipid MetabolismAir Ionization8,11,14-Eicosatrienoic AcidChromatography, GelPentanesReference ValuesBreath TestsRhodiolaWater PollutantsChromatography, Reverse-PhaseMethanolCarbon IsotopesIonsPeptidesEnvironmental MonitoringOligosaccharidesCarbon RadioisotopesSugar AcidsDose-Response Relationship, DrugSolid Phase ExtractionGlucoseElectrophoresis, Gel, Two-DimensionalCholesterolAcetatesSugar AlcoholsSpectrophotometry, UltravioletAmino Acids
High-performance liHPLCTandemFlame ionisation detectionChromatographicAPCISolid-phase microextrAnalytesNegative ionSpectrometersElectrospray ionizationHeadspaceDeterminationIsotopeChemical ionizationMoleculesOrganicSpectrometricSpectroscopyAnalyteLiquidAnalysesSensitivityAnalysisSolventVolatileSituFluorescenceHydrolysisDetectorMethodsInorganicInstrumentationRATIOSQuadrupoleChromatographFindingsQualitativeMethodHalogenFragmentationEnvironmentalIonizeSpectrometerIonsConcentrationsLaboratoryExtractionSampleMALDI-TOFThermalLimits of detection
High-performance li7
  • Conifer seed oils from European Larch (Larix decidua), Norway Spruce (Picea abies) and European Silver Fir (Abies alba) have been analyzed by non-aqueous reversed-phase high-performance liquid chromatography (NARP-HPLC) with atmospheric pressure chemical ionisation (APCI)-MS detection. (unboundmedicine.com)
  • A High Performance Liquid Chromatography-Mass Spectrometry (HPLC-MS) Qualitative Detection Method Developed for In Vivo Analyses of Toxin Orellanine from the Cortinarius orellanus Fr. (hindawi.com)
  • The high-performance liquid chromatography-mass spectrometry (HPLC-MS) qualitative analysis method in negative mode of detection was used to record the presence of orellanine in the stomach contents of rats after ingestion of Cortinarius orellanus . (hindawi.com)
  • Another popular method of analysis is high-performance liquid chromatography (HPLC), which separates compounds based on the length of time that they interact with a stationary phase of functionalized glass beads using a specific mobile phase or solvent(s), and analyzes the resulting outflow (eluent) with different detection techniques to determine the relative percent (or qualitative presence) of which molecules abound. (extractionmagazine.com)
  • Fluorescence high-performance liquid chromatography (HPLC) indicated the presence of mycolic acids of the mycobacterial type, but they were degraded and could not be precisely correlated with tuberculosis. (birmingham.ac.uk)
  • Microbial components or products are separated and identified using high-performance liquid chromatography (HPLC) or gas chromatography. (msdmanuals.com)
  • Tracqui A, Kintz P, Ludes B, Rouge C, Douibi H, Mangin P. High-performance liquid chromatography coupled to ion spray spectrometry for the determination of colchicine at ppb levels in human biofluids. (cdc.gov)
HPLC4
  • Established isotope ratio mass spectrometry methods for analyzing urinary steroids for doping control purposes consist of up to two time-consuming HPLC purification steps to achieve the required purity of all analytes. (uni-koeln.de)
  • For example, 2 could not be detected but appeared to have rearranged to 3-2-chloroethylindole 3 and 2-methyltetrahydro-beta-carboline 4, whereas HPLC analysis enabled the detection of 2. (erowid.org)
  • 1) in the first part of the study, the analytical methods examined were isocratic high pressure liquid chromatography (HPLC) with ultraviolet (UV) detection, capillary gas chromatography (GC) with temperature programming and flame ionisation detection and gas chromatography-mass spectrometry (GC-MS). Twelve NSAIDs in common use in the UK were selected as test compounds for the evaluation of the separating ability, selectivity and sensitivity of detection of the three methods. (gla.ac.uk)
  • In addition, fluorescence spectrometry and electrochemical detection (ECD) were examined to assess their value as additional HPLC detection systems which might increase the selectivity or sensitivity of the method. (gla.ac.uk)
Tandem9
  • The solution containing the chloropropyl esters was concentrated and then analyzed using gas chromatography-positive chemical ionization-tandem mass spectrometry. (cdc.gov)
  • Analysis of this side-product by gas chromatography ion trap mass spectrometry GC-MS, both in electron and chemical ionisation tandem MS modes, gave only degradation products. (erowid.org)
  • In this study, a sensitive and reliable method based on an ultra-performance liquid chromatography (UPLC) couple with two ionisation modes, including electrospray ionisation (ESI) and atmospheric pressure chemical ionisation (APCI) tandem mass spectrometry (MS), namely, UPLC-ESI/APCI-MS/MS was developed and validated to simultaneously determine 8 triterpenoids (ESI mode) and 2 sesquiterpenoids (APCI mode) in RA. (hindawi.com)
  • Mass spectrometry is an analysis method that can be performed once using a single analyzer, or it can be performed in tandem between different mass analyzers (such as those found in hybrid or tribrid mass spectrometers). (thermofisher.com)
  • The practice of simultaneous MS is frequently termed tandem mass spectrometry (MS/MS or MS 2 ) and refers to two or more reaction steps being performed on selected ions. (thermofisher.com)
  • Recently, we introduced a heated nebulizer microchip and showed its potential to interface liquid microseparation techniques and GC with API-MS. This study demonstrates the feasibility of GC-microchip atmospheric pressure photoionization-tandem mass spectrometry (GC-μAPPI-MS/MS) in the analysis of underivatized anabolic steroids in urine. (aalto.fi)
  • Joseph P. Kennedy performs multidisciplinary studies into Electrospray ionization and Tandem mass spectrometry in his work. (research.com)
  • In his works, Joseph P. Kennedy performs multidisciplinary study on Tandem mass spectrometry and Electrospray ionization. (research.com)
  • Tandem mass spectrometry is a method to further enhance the specificity of mass spectrometry. (myadlm.org)
Flame ionisation detection1
Chromatographic4
APCI4
  • TGs containing Delta5-UPIFAs have a higher retention in comparison with common TGs found in plant oils with single methylene interrupted Delta6(9)-FAs and also significantly changed relative abundances of fragment ions in APCI mass spectra. (unboundmedicine.com)
  • The past decade has witnessed resurgent interest in coupling GC to atmospheric pressure chemical ionization (APCI), which requires high gas flows to assist ionization. (chromatographyonline.com)
  • Example ionization methods include atmospheric pressure chemical ionization (APCI) , electron ionization (EI), electrospray ionization (ESI) , chemical ionization (CI) inductively coupled plasma (ICP) ionization, and matrix-assisted laser desorption/ionization (MALDI). (thermofisher.com)
  • The APCI (Atmospheric pressure chemical ionization) heater has a Resistance Temperature Detector (RTD) built into it. (belilove.com)
Solid-phase microextr5
  • The aroma profiles of hops were detected by flavor-detection methods including Gas chromatogram-flame ionization detector (GC-FID), Gas chromatography-mass spectrometry (GC-MS), Headspace solid-phase microextraction/gas chromatogram-mass spectrometry (HS-SPME/GC-MS), and sensory evaluation. (unl.edu)
  • The Column spoke to Katherine Curran, a lecturer in Sustainable Heritage at the UCL Institute for Sustainable Heritage in London, UK, about her work classifying museum artefacts using volatile organic compound (VOC) analysis and solid-phase microextraction-gas chromatography-mass spectrometry (SPME-GC-MS). (chromatographyonline.com)
  • Borrowing concepts from Solid-phase microextraction, Joseph P. Kennedy weaves in ideas under Gas chromatography-mass spectrometry. (research.com)
  • He integrates many fields, such as Solid-phase microextraction and Mass spectrometry, in his works. (research.com)
  • Title : Quantitative Analysis of Menthol in Human Urine Using Solid Phase Microextraction and Stable Isotope Dilution Gas Chromatography/Mass Spectrometry Personal Author(s) : Huang, Wenlin;Blount, Benjamin C.;Watson, Clifford H.;Watson, Christina;Chambers, David M. (cdc.gov)
Analytes6
  • The limits of detection and quantification for analytes were 0.14-1.67 ng/mL and 0.44-5.65 ng/mL, respectively. (hindawi.com)
  • When combined with chromatography, such as liquid or gas chromatography, the potential for MS to identify and quantitate analytes of interest increases dramatically. (thermofisher.com)
  • Analytes that will not ionize within a flame such as nitrogen, oxygen, and carbon dioxide, are limited to thermal conductivity detection. (uaf.edu)
  • For analytes introduced into the mass spectrometer as a liquid, several types of sources exist including electrospray ionization and atmospheric pressure chemical ionization. (myadlm.org)
  • The electrical discharge first ionizes the evaporated solvent which in turn ionizes the analytes in the gas phase. (myadlm.org)
  • Although every type of mass spectrometer uses the same charged ions, how it separates individual analytes varies greatly. (myadlm.org)
Negative ion4
Spectrometers9
  • I read the story of how Tulane University professors rescued their prized nuclear magnetic resonance spectrometers during Hurricane Katrina ( C&EN, Aug. 31, 2015, page 27 ), and as I did so, the only thought that crossed my mind was, "This has to be made into a movie. (acs.org)
  • Modern flight-capable mass spectrometers, in combination with various sample processing, separation, and ionization techniques enable sensitive detection of chemical biosignatures. (frontiersin.org)
  • Differential flow modulation is a simple and cost-effective alternative to thermal modulation, but the requisite high flow rates are generally perceived as being incompatible with most (electron ionization [EI] and chemical ionization [CI]) mass spectrometers. (chromatographyonline.com)
  • This is because mass spectrometers separate particles by calculating their different mass-to-charge ratios (m/z). (thermofisher.com)
  • Different analyzers are also combined in hybrid and tribrid mass spectrometers. (thermofisher.com)
  • The general operation of mass spectrometers, including hybrid and tribrid mass spectrometers. (thermofisher.com)
  • Mass spectrometers equipped with atmospheric pressure ion sources (API-MS) have been designed to be interfaced with liquid chromatographs (LC) and have rarely been connected to gas chromatographs (GC). (aalto.fi)
  • Topics for discussion will include ionization methods, the different types of mass spectrometers used clinically, different methods of analysis, and highlight some future areas where mass spectrometry will most likely be applied. (myadlm.org)
  • Single quadrupole and triple quadrupole mass analyzers are the most common mass spectrometers found in the clinical laboratory, but it's important to recognize that laboratories are also using time of flight analyzers for specific applications. (myadlm.org)
Electrospray ionization3
  • Their structures were characterized by extensive analysis of spectroscopic data (IR, UV, high-resolution electrospray ionization mass spectrometry (HR-ESI-MS), one-dimensional (1D) and two-dimensional (1D) NMR), electronic circular dichroism (ECD) calculation, and by comparison with literature data. (bvsalud.org)
  • Wilm, M (2011) Principles of electrospray ionization. (thermofisher.com)
  • Determination of colchicine in biological fluids by liquid chromatography mass spectrometry with pneumatically assisted electrospray ionization. (cdc.gov)
Headspace1
  • Headspace gas chromatography with flame ionization detection (GC-FID) is often used for residual solvent testing of pharmaceuticals, though the qualitative power of this method is not particularly high. (shimadzu.com)
Determination4
Isotope2
Chemical ionization1
  • The instrument is extremely sensitive due to the use of chemical ionization, allowing detection limits in the lower parts per quadrillion (ppq, 10−15) range. (lancs.ac.uk)
Molecules6
  • While gel permeation chromatography/size-exclusion chromatography (GPC/SEC) of uncharged molecules in organic eluents in most cases is a straightforward task, aqueous GPC/SEC of polyelectrolytes usually requires more parameters to be considered and optimized. (chromatographyonline.com)
  • Atoms and molecules must first be ionized before they can be accelerated through the mass spectrometer and detected. (thermofisher.com)
  • The APPI microchip provides high ionization efficiency and produces abundant protonated molecules or molecular ions with minimal fragmentation. (aalto.fi)
  • This heater assembly is used in the electron ionization in gas chromatography and mass spectrometry to ionize and fragment analyte molecules before mass spectrometric analysis and detection. (belilove.com)
  • Electron ionization uses a beam of electrons that interact with molecules to form radical cations, which in turn often undergo fragmentation in the source to more stable species. (myadlm.org)
  • Kharbatia is specialized in analytical method development and validation for trace small organic molecules detection and quantification using liquid and gas chromatography and mass spectrometry techniques with focusing on the related application such as environmental analysis and persistent organic pollutants, metabolomics and lipidomics analyses in plant, tissues and biological fluids. (edu.sa)
Organic8
  • A structural-activity relationship for the estimation of rate constants for the gas-phase reactions of OH radicals with organic compounds. (cdc.gov)
  • Film bulk acoustic wave resonators have demonstrated great potential in the detection of volatile organic compounds owing to their high sensitivity, miniature size, low power consumption, capacity for integration, and other beneficial characteristics. (researchgate.net)
  • Here, we report a convenient and reliable method for functionalizing the surfaces of film bulk acoustic wave resonators with hydrophobins via self-assembly to enable highly sensitive and polarity sensitive detection of volatile organic compounds. (researchgate.net)
  • Distributions of the five source gases and total organic bromine just below the tropopause show an increase in mixing ratio with latitude, in particular during polar winter. (lancs.ac.uk)
  • Consequently, the scenario also overestimates the amount of brominated organic gases in the stratosphere. (lancs.ac.uk)
  • 2) The second part of the study established the normal pattern of organic acids present in greyhound urine, which would be co-extracted with any NSAIDs present and might lead to interference in the detection and quantitation of the drugs. (gla.ac.uk)
  • Gas chromatography techniques are applicable to gas samples, and samples containing volatile and/or semi-volatile organic compounds dissolved in an organic solvent such as hexane or methylene chloride. (uaf.edu)
  • Instrumentation is available for the quantitative analysis of anions, cations, total organic and inorganic carbon, and gas sample components . (uaf.edu)
Spectrometric1
  • c) GC-MS : Gas chromatography with mass spectrometric detection was carried out using similar GC conditions to those described above. (gla.ac.uk)
Spectroscopy3
  • Using the power and high throughput of analytical platforms, such as mass spectrometry (MS) or nuclear magnetic resonance (NMR) spectroscopy, metabolomics promises to be a cornerstone in innovations and discoveries in the areas of medicine, agriculture, biomedical, space, and environment. (chromatographyonline.com)
  • Cholesterol and oxidized cholesterol metabolite serum levels of FH and of healthy, gender/age matched control subjects were measured by combined gas chromatography - mass spectroscopy. (biomedcentral.com)
  • Mass spectroscopy is one of a number of innovative technologies that are being or have been developed for detection and identification of biological warfare and bioterrorism agents. (msdmanuals.com)
Analyte7
  • A typical electron ionization source exposes the analyte, under vacuum to a stream of thermionic electrons produced from a resistively heated-gas weldment assembly. (belilove.com)
  • He performs multidisciplinary studies into Mass spectrometry and Analyte in his work. (research.com)
  • In order for an analyte to be measured using mass spectrometry it must carry a charge and be in the gas phase. (myadlm.org)
  • If gas chromatography is used, the analyte is already in the gas phase and an electron ionization source is used to generate a charged analyte. (myadlm.org)
  • An analyte with a molecular weight of 415 and a charge of +1 will have a mass-to-charge ratio of 415. (myadlm.org)
  • With the mass of our analyte known, we need to decide what type of mass spectrometer to use for analysis. (myadlm.org)
  • For an analyte at a known mass-to-charge ratio, the amount of positive or negative charge and the frequency at which the diagonal pairs switch their sign is optimized to produce a successful ion flight path through the quadrupole. (myadlm.org)
Liquid3
  • 1995. Validation of an enzymatic biosensor with liquid chromatography for pesticide monitoring. (cdc.gov)
  • Gas chromatography-mass spectrometry - (GC MS) is a method that combines the features of gas liquid chromatography and mass spectrometry to identify different substances within a test sample. (academic.ru)
  • Over the years, technologic advances in electronics and detectors have allowed GC/MS to detect ever smaller concentrations of compounds, as has the addition of other analytical techniques, such as liquid chromatography. (medscape.com)
Analyses2
  • Generally, Congener-specific analyses offer lower detection limits and a higher information content than do Aroclor analyses. (pacelabs.com)
  • We showed that integrated metabolome- and genome-scale model analyses were an effective approach for engineering the metabolic node for PMA synthesis, and also developed an economical and green process for PMA and MA production from renewable biomass feedstocks. (biomedcentral.com)
Sensitivity4
  • In a sensitivity study we find maximum differences of a factor 2 in inorganic bromine in the lowermost stratosphere from source gas injection derived from observations and model outputs. (lancs.ac.uk)
  • Heptafluorobutyryl derivatives of both VER and TRID exhibited little MS fragmentation and gave much higher detection sensitivity (sub-picogram injected onto the GC column), both in GC-MS and GC-MSMS, than trimethylsilyl derivatives. (diva-portal.org)
  • TOF analyzers have essentially an unlimited mass-to-charge range, very high sensitivity, very high mass accuracy, high transmission percentage but a limited dynamic range. (myadlm.org)
  • Quadrupoles have a limited mass-to- charge range, high sensitivity, high mass accuracy, but a low ion transmission percentage. (myadlm.org)
Analysis14
  • 1990. Utilization of solid-phase extraction and reversed-phase and ion- pair chromatography in the analysis of seven agrochemicals in water. (cdc.gov)
  • Gas chromatography/mass spectrometry (GC/MS) is a well-known instrumental technique used for the analysis of fire debris for accelerant detection. (astm.org)
  • Analysis incorporated an ion preparation method (IPM) that manipulates the ion population in the ion trap following ionization but prior to ion analysis. (astm.org)
  • Because gas chromatography mass spectrometry (GC/MS) utilizes MS to perform qualitative analysis based on mass spectra, GC/MS can be used to estimate and identify individual peaks detected in the expected vicinity of a target solvent as well as other unknown peaks. (shimadzu.com)
  • Gas chromatography-mass spectrometry (GC-MS) was used in the qualitative analysis of RA for the volatile oil, containing sesquiterpenoids [ 25 ]. (hindawi.com)
  • Mass spectrometry has four essential functions, which are ionization, separation (filtering), detection and analysis. (thermofisher.com)
  • In the first step of mass analysis, precursor ions are formed in the ion source and induced to fragment. (thermofisher.com)
  • The different approaches to sample labeling and mass spectrometry analysis. (thermofisher.com)
  • The most common and generally considered the workhorse of PCB analysis is gas chromatography-electron capture detection (GC-ECD), the next instrument is gas chromatography (GC) with low resolution, electron ionization mass spectrometry (MS), and in recent years the industry has added the most sensitive instrument thus far for PCB congener analysis ― Gas Chromatography coupled with High Resolution Mass Spectrometry HRGC/HRMS. (pacelabs.com)
  • The feasibility of GC-μAPPI-MS/MS in the analysis of six selected anabolic steroids in urine samples was studied with respect to intra-batch repeatability, linearity, linear range, and limit of detection (LOD). (aalto.fi)
  • An Agilent 6890N and 5973 MSD gives the lab mass spectrometry capability for analysis of volatiles and semi-volatiles, and a Shimadzu GC2014 gives the lab flame ionization detection and thermal conductivity detection capabilities for volatiles, semi-volatiles, and gas samples. (uaf.edu)
  • This mass spectrum gives GC/MS its qualitative analysis capability. (uaf.edu)
  • Once we have a way to get ions charged and into the gas phase, the most important aspect in the analysis is the mass-to-charge ratio, designated as m over z. (myadlm.org)
  • GC/MS analysis allows separation of compounds based on their retention time within a chromatography column and identification of each compound by the characteristic fragments into which a given chemical is broken following ionization of the compound. (medscape.com)
Solvent1
  • Nitrogen gas is introduced, the gaseous solvent is heated up to 400°C and the sample is then ionized by corona discharge. (belilove.com)
Volatile3
  • Direct exposures include breathing contaminated air (volatile fractions which are emitted as gases), and direct contact with the skin (while walking in contaminated areas). (envrexperts.com)
  • A method coupling steam distillation/drop-by-drop extraction with gas chromatography-mass spectrometry (S3DE/GC-MS) was developed to determine the volatile components of jujube extract. (biomedcentral.com)
  • Gas chromatography-mass spectrometry (GC-MS) is typically employed to analyze volatile components in flavorings. (biomedcentral.com)
Situ3
  • The in situ detection of both 3 and 4 within a DMT sample may have led to erroneous conclusions with regards to the identification of the synthetic route. (erowid.org)
  • Methane (CH4) hydrate growth and dissociation in partially water- and gas-saturated Bentheim sandstone were spatially resolved using Magnetic Resonance Imaging (MRI), which allows the in situ monitoring of saturation and phase transitions. (acs.org)
  • The measurements have been obtained using an in situ gas chromatography and mass spectrometry (GC-MS) system on board the High Altitude and Long Range Research Aircraft (HALO). (lancs.ac.uk)
Fluorescence1
  • Five of the test compounds could be detected by fluorescence spectrometry and seven by ECD. (gla.ac.uk)
Hydrolysis3
  • Acid hydrolysis of PMA, resulting in release of the monomer l -malic acid (MA), which is widely used in the food and chemical industry, is a competitive process for producing bio-based platform chemicals. (biomedcentral.com)
  • Using fed-batch fermentation of FJ-PYC, we obtained the highest PMA titers (81.5, 94.2 g/L of MA after hydrolysis) in 140 h with a corresponding MA yield of 0.62 g/g and productivity of 0.67 g/L h. (biomedcentral.com)
  • In addition, its monomer MA can be easily generated from PMA via acid hydrolysis. (biomedcentral.com)
Detector8
  • Retention time stability and transfer windows were monitored by a flame ionization detector. (uni-koeln.de)
  • These functions are coordinated by the following components: the ion source, mass analyzer, detector and software. (thermofisher.com)
  • Flame Ionization Detection, or FID (pronouncing each letter), is a cheap and standard detector which has a long history of use in the automotive industry for measuring the total hydrocarbon concentration, as well as various other molecular species, in a given engine emissions sample. (extractionmagazine.com)
  • Ionization chamber - An ionization chamber is a device used for two major purposes: detecting particles in air (as in a smoke detector), and for detection or measurement of ionizing radiation. (academic.ru)
  • Gas Electron Multiplier - The Gas Electron Multiplier (GEM) is a type of gaseous ionization detector used in nuclear and particle physics and radiation detection. (academic.ru)
  • The MSD detector is unique in that it generates a mass spectrum for each individual compound within a chromatogram. (uaf.edu)
  • Time-of-flight analyzers use an electric field to accelerate bundles of gas phase ions towards a detector. (myadlm.org)
  • How long the mass spectrometer sits at a voltage and frequency combination is called the dwell time, during which only a limited number of ions are successfully reaching the detector. (myadlm.org)
Methods2
  • The numerical codes/tools describing processes involved during the dissociation (induced by several methods) for gas production from hydrates are powerful, but they need validation by comparison to empirical data to instill confidence in their predictions. (acs.org)
  • We optimized gas chromatography-mass spectrometry (GC-MS) methods for detecting VER and TRID in S. chartarum-contaminated indoor environmental samples. (diva-portal.org)
Inorganic1
  • Using better emission scenarios and reasonable assumptions on fractional contribution from the different source regions, the differences in inorganic bromine from source gas injection between model and observations is usually on the order of 1 ppt or less. (lancs.ac.uk)
Instrumentation2
  • The facility boasts a wide range of equipment from multiple manufacturers covering instrumentation in gas chromatography such as comprehensive multi-dimensional gas chromatography, PTV injectors, autosamplers, thermal desorbers and pyrolysers. (anthias.co.uk)
  • Dionex Aquion instrumentation, equipped with a conductivity detectors, gives the WERC lab High Performance Ion Chromatography (HPIC) capability. (uaf.edu)
RATIOS1
  • How long it takes a given ion to travel down the flight tube is how ions of different mass-to-charge ratios are distinguished. (myadlm.org)
Quadrupole1
  • A variety of mass spectrometer types, including magnetic sector, quadrupole, time-of-flight, and ion trap, have and will continue to deepen our understanding of the formation and evolution of exploration targets like the surfaces and atmospheres of planets and their moons. (frontiersin.org)
Chromatograph2
  • The FID is usually coupled to a gas chromatograph, which serves to vaporize and separate the components of the sample before they reach the FID. (extractionmagazine.com)
  • The number of ions produced, and therefore the electric signal, are proportional to the amount of hydrocarbons that were present during that particular ejection time of the gas chromatograph. (extractionmagazine.com)
Findings1
  • These findings were supported by the detection of C(34) and C(36) phthiocerols, which are usually esterified to the mycocerosates. (birmingham.ac.uk)
Qualitative1
Method3
  • This paper describes a method of analyzing arson accelerants using gas chromatography coupled with ion trap mass spectrometry/mass spectrometry (GC/MS/MS). Petrol was investigated as an accelerant. (astm.org)
  • The detection method presented here can be used as a platform for future development of analytical procedures for detecting orellanine in cases of human intoxication by toadstools. (hindawi.com)
  • Quantitative performance of the method was tested with two authentic urine samples, and the results were in good agreement with those obtained with conventional GC-electron ionization-MS after derivatization. (aalto.fi)
Halogen1
  • We conclude that a good representation of the contributions of different source regions is required in models for a robust assessment of the role of short-lived halogen source gases on ozone depletion in the UTLS. (lancs.ac.uk)
Fragmentation1
  • He is also interested in mass spectrometry electron ionization (EI) and collision induced dissociation (CID) fragmentation interpretation and unknown identification. (edu.sa)
Environmental1
  • Detection of colchicine in environmental samples. (cdc.gov)
Ionize1
  • Hydrocarbons such as methane will ionize and conduct within a flame, making them good candidates for flame ionization detection. (uaf.edu)
Spectrometer3
  • The heart of the mass spectrometer is its mass analyzer. (thermofisher.com)
  • Samples must be ionized (or charged) before they can be manipulated by electric and magnetic fields within the mass spectrometer. (thermofisher.com)
  • The final stage of detection using a mass spectrometer is the focus of this portion of Pearls of Laboratory Medicine. (myadlm.org)
Ions4
  • Parent ions of selected mass-to-charge ( m/z ) values, characteristic for petrol, are stored within the ion trap. (astm.org)
  • Learn more about how mass analyzers separate, select and even fragment ions based on their distinct masses and charges. (thermofisher.com)
  • As the drops become smaller, ion concentration increases until ions at the surface are ejected into the gas phase. (myadlm.org)
  • Since all ions are being accelerated by the same electric field, ions with a low mass-to-charge ratio will accelerate faster than ions with a high mass-to-charge ratio. (myadlm.org)
Concentrations1
  • The implications of the results with respect to the detection of these five drugs and the interpretation of their concentrations during a screening procedure at a race meeting are discussed. (gla.ac.uk)
Laboratory3
  • A very compact, fast responding electric heating element for liquids and gases for all clean, bio-med, laboratory, food, and pharmaceutical applications. (belilove.com)
  • Within the WERC laboratory two separate gas chromatography instruments are available. (uaf.edu)
  • This portion of the Pearls of Laboratory Medicine series will serve as an introduction to clinical mass spectrometry. (myadlm.org)
Extraction1
  • Hydraulic fracturing is a technique where pressurized fluid and sand or other solids (proppant) are used in gas drilling to allow gas extraction. (chromatographyonline.com)
Sample7
  • In order to accelerate the sample preparation, multidimensional gas chromatography was applied. (uni-koeln.de)
  • All of the test compounds were eluted from the column and could be detected by UV spectrometry at a sample size of 5 nanograms on-column. (gla.ac.uk)
  • The various options for sample ionization using different ion sources. (thermofisher.com)
  • As the sample gas is fed across the flame, any hydrocarbons that are present combust. (extractionmagazine.com)
  • His research on Chromatography frequently links to adjacent areas such as Sample preparation. (research.com)
  • Special sample introduction techniques utilizing sodium borohydride can reduce detection limits one to two orders of magnitude for some elements such as Selenium and Arsenic. (uaf.edu)
  • Sample collection and preparation of biofluids and extracts for gas chromatography-mass spectrometry, A.H.M. Emwas, Z.A. Al-Talla, N.M. Kharbatia. (edu.sa)
MALDI-TOF1
  • Currently, a form of mass spectrometry called matrix-assisted laser desorption ionization-time of flight (MALDI-TOF) is being used to identify bacteria (including mycobacteria), yeasts, molds, and potentially viruses. (msdmanuals.com)
Thermal2
Limits of detection1
  • The limits of detection for cyanide and thiocyanate were 1 μM and 50 nM, respectively. (sdstate.edu)