A hybrid separation technique combining both chromatographic and electrophoretic separation principles. While the method was invented to separate neutral species, it can also be applied to charged molecules such as small peptides.
A plant genus of the family APIACEAE. Members contain osthol.
A group of naturally occurring amines derived by enzymatic decarboxylation of the natural amino acids. Many have powerful physiological effects (e.g., histamine, serotonin, epinephrine, tyramine). Those derived from aromatic amino acids, and also their synthetic analogs (e.g., amphetamine), are of use in pharmacology.
Inorganic or organic salts and esters of boric acid.
A metabolite of primidone.
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)
The minute vessels that connect the arterioles and venules.
A bile salt formed in the liver by conjugation of deoxycholate with taurine, usually as the sodium salt. It is used as a cholagogue and choleretic, also industrially as a fat emulsifier.
Eight-carbon saturated hydrocarbon group of the methane series. Include isomers and derivatives.
A plant species of the family VACCINIUM.
A plant genus of the genus STRYCHNOS, family LOGANIACEAE that is the source of STRYCHNINE.
Compounds in which a methyl group is attached to the cyano moiety.
Heterocyclic rings containing three nitrogen atoms, commonly in 1,2,4 or 1,3,5 or 2,4,6 formats. Some are used as HERBICIDES.
Pesticides used to destroy unwanted vegetation, especially various types of weeds, grasses (POACEAE), and woody plants. Some plants develop HERBICIDE RESISTANCE.
A foul-smelling diamine formed by bacterial decarboxylation of lysine.
A separation technique which combines LIQUID CHROMATOGRAPHY and CAPILLARY ELECTROPHORESIS.
A highly miniaturized version of ELECTROPHORESIS performed in a microfluidic device.
Methods utilizing the principles of MICROFLUIDICS for sample handling, reagent mixing, and separation and detection of specific components in fluids.
The preparation and analysis of samples on miniaturized devices.
The analysis of a chemical substance by inserting a sample into a carrier stream of reagent using a sample injection valve that propels the sample downstream where mixing occurs in a coiled tube, then passes into a flow-through detector and a recorder or other data handling device.
Exclusive legal rights or privileges applied to inventions, plants, etc.
A plant genus in the CANNABACEAE family. Best known for the buds of Humulus lupulus L. used in BEER.
An alcoholic beverage usually made from malted cereal grain (as barley), flavored with hops, and brewed by slow fermentation.
Six-carbon alicyclic hydrocarbons which contain one or more double bonds in the ring. The cyclohexadienes are not aromatic, in contrast to BENZOQUINONES which are sometimes called 2,5-cyclohexadiene-1,4-diones.
A class of compounds composed of repeating 5-carbon units of HEMITERPENES.
Occupations of medical personnel who are not physicians, and are qualified by special training and, frequently, by licensure to work in supporting roles in the health care field. These occupations include, but are not limited to, medical technology, physical therapy, physician assistant, etc.
Development of a library collection, including the determination and coordination of selection policy, assessment of needs of users and potential users, collection use studies, collection evaluation, identification of collection needs, selection of materials, planning for resource sharing, collection maintenance and weeding, and budgeting.
Substances intended to be applied to the human body for cleansing, beautifying, promoting attractiveness, or altering the appearance without affecting the body's structure or functions. Included in this definition are skin creams, lotions, perfumes, lipsticks, fingernail polishes, eye and facial makeup preparations, permanent waves, hair colors, toothpastes, and deodorants, as well as any material intended for use as a component of a cosmetic product. (U.S. Food & Drug Administration Center for Food Safety & Applied Nutrition Office of Cosmetics Fact Sheet (web page) Feb 1995)
Liquids that are suitable for drinking. (From Merriam Webster Collegiate Dictionary, 10th ed)
A methylxanthine naturally occurring in some beverages and also used as a pharmacological agent. Caffeine's most notable pharmacological effect is as a central nervous system stimulant, increasing alertness and producing agitation. It also relaxes SMOOTH MUSCLE, stimulates CARDIAC MUSCLE, stimulates DIURESIS, and appears to be useful in the treatment of some types of headache. Several cellular actions of caffeine have been observed, but it is not entirely clear how each contributes to its pharmacological profile. Among the most important are inhibition of cyclic nucleotide PHOSPHODIESTERASES, antagonism of ADENOSINE RECEPTORS, and modulation of intracellular calcium handling.
The infusion of leaves of CAMELLIA SINENSIS (formerly Thea sinensis) as a beverage, the familiar Asian tea, which contains CATECHIN (especially epigallocatechin gallate) and CAFFEINE.
An antioxidant flavonoid, occurring especially in woody plants as both (+)-catechin and (-)-epicatechin (cis) forms.
Camellia sinensis L. (formerly Thea sinensis) is an evergreen Asiatic shrub of the THEACEAE family. The infusion of leaves of this plant is used as Oriental TEA which contains CAFFEINE; THEOPHYLLINE; and epigallocatechin gallate.
A large class of organic compounds having more than one PHENOL group.
A nonlinear electrophoretic technique used to separate a variety of ionic compounds, ranging from small metal ions to large molecules like proteins. Unlike "linear" zone electrophoresis in which separating solute bands continually spread by diffusion or dispersion, isotachophoresis forms self-sharpening, adjacent zones of substantially pure solute whose concentrations often exceed several mgs/ml. In isotachophoresis a multianalyte sample is introduced between the leading electrolyte and the terminating electrolyte where the sample ions have lower electrophoretic mobilities than the leading ion but larger than the terminating ion. (From "Isotachophoresis" on the AES Web Site [Internet]. Madison, WI: The American Electrophoresis Society; c2000-2008 [cited 2009 Aug 20]. Available from http://www.aesociety.org/areas/isotachophoresis.php)
Works containing information articles on subjects in every field of knowledge, usually arranged in alphabetical order, or a similar work limited to a special field or subject. (From The ALA Glossary of Library and Information Science, 1983)
A sulfuric acid dimer, formed by disulfide linkage. This compound has been used to prolong coagulation time and as an antidote in cyanide poisoning.
A phenomenon in which the surface of a liquid where it contacts a solid is elevated or depressed, because of the relative attraction of the molecules of the liquid for each other and for those of the solid. (from McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
The use of a layer of tooth-colored material, usually porcelain or acrylic resin, applied to the surface of natural teeth, crowns, or pontics by fusion, cementation, or mechanical retention.
A type of porcelain used in dental restorations, either jacket crowns or inlays, artificial teeth, or metal-ceramic crowns. It is essentially a mixture of particles of feldspar and quartz, the feldspar melting first and providing a glass matrix for the quartz. Dental porcelain is produced by mixing ceramic powder (a mixture of quartz, kaolin, pigments, opacifiers, a suitable flux, and other substances) with distilled water. (From Jablonski's Dictionary of Dentistry, 1992)
Substances and materials manufactured for use in various technologies and industries and for domestic use.
A class of devices combining electrical and mechanical components that have at least one of the dimensions in the micrometer range (between 1 micron and 1 millimeter). They include sensors, actuators, microducts, and micropumps.
Any change in the hue, color, or translucency of a tooth due to any cause. Restorative filling materials, drugs (both topical and systemic), pulpal necrosis, or hemorrhage may be responsible. (Jablonski, Dictionary of Dentistry, 1992, p253)
The plan and delineation of dental prostheses in general or a specific dental prosthesis. It does not include DENTURE DESIGN. The framework usually consists of metal.
A prosthesis or restoration placed for a limited period, from several days to several months, which is designed to seal the tooth and maintain its position until a permanent restoration (DENTAL RESTORATION, PERMANENT) will replace it. (From Jablonski, Dictionary of Dentistry, 1992)
Facilities which provide information concerning poisons and treatment of poisoning in emergencies.
A condition or physical state produced by the ingestion, injection, inhalation of or exposure to a deleterious agent.
A colorless, odorless, viscous dihydroxy alcohol. It has a sweet taste, but is poisonous if ingested. Ethylene glycol is the most important glycol commercially available and is manufactured on a large scale in the United States. It is used as an antifreeze and coolant, in hydraulic fluids, and in the manufacture of low-freezing dynamites and resins.
An ethylene compound with two hydroxy groups (-OH) located on adjacent carbons. They are viscous and colorless liquids. Some are used as anesthetics or hypnotics. However, the class is best known for their use as a coolant or antifreeze.
Derivatives of ethylene, a simple organic gas of biological origin with many industrial and biological use.
Agents counteracting or neutralizing the action of POISONS.
Drugs used to treat or prevent skin disorders or for the routine care of skin.

Separation of urea, uric acid, creatine, and creatinine by micellar electrokinetic capillary chromatography with sodium cholate. (1/66)

The capillary electrophoretic separation of the four nonprotein nitrogenous compounds (NPNs; urea, uric acid, creatine, and creatinine) typically employed in clinical and medical settings for the monitoring of renal function is described. Successful resolution of these compounds is achieved with the use of a bile salt micelle system composed of sodium cholate at phosphate buffer pH 7.4. The elution patterns of four NPNs are obtained within 30 min with a voltage of 30 kV. The effect of varying the applied voltage, temperature, and the mole ratio of phosphate buffer with bile salt surfactant on the migration behavior is also examined.  (+info)

Quantification of riboflavin, flavin mononucleotide, and flavin adenine dinucleotide in human plasma by capillary electrophoresis and laser-induced fluorescence detection. (2/66)

BACKGROUND: Riboflavin is the precursor of flavin mononucleotide (FMN) and FAD, which serve as cofactors for several redox enzymes. We have developed a capillary electrophoresis method for the determination of riboflavin and its two coenzyme forms in human plasma. METHODS: Trichloroacetic acid-treated plasma was subjected to solid-phase extraction on reversed-phase columns. The analytes were separated by micellar electrokinetic capillary chromatography in uncoated fused- silica capillaries filled with borate buffer containing 50 mmol/L sodium dodecyl sulfate, methanol, and N-methylformamide. Native fluorescence was monitored at 530 nm, using an argon laser operating at 488 nm as excitation source. RESULTS: The assay was linear over a concentration range of two orders of magnitude, and the limit of detection was far below physiological concentrations for all vitamers. The within-day and between-day coefficients of variation were 4-9% and 6-12%, respectively. The reference values (median, 5-95 percentiles) obtained by analyzing plasma from 63 healthy subjects were 8.6 nmol/L (2.7-42.5 nmol/L) for riboflavin, 7.0 nmol/L (3.5-13.3 nmol/L) for FMN, and 57.9 nmol/L (44.5-78.1 nmol/L) for FAD. CONCLUSIONS: Capillary electrophoresis with laser-induced fluorescence detection allows determination of all riboflavin vitamers far below physiological concentrations. The method may become a useful tool for the assessment of riboflavin status in humans.  (+info)

Simultaneous determination of sweeteners and preservatives in preserved fruits by micellar electrokinetic capillary chromatography. (3/66)

A micellar electrokinetic capillary method for the simultaneous determination of the sweeteners dulcin, aspartame, saccharin, and acesulfame-K and the preservatives sorbic acid; benzoic acid; sodium dehydroacetate; and methyl-, ethyl-, propyl-, isopropyl-, butyl-, and isobutyl-p-hydroxybenzoate in preserved fruits is developed. These additives are ion-paired and extracted using sonication followed by solid-phase extraction from the sample. Separation is achieved using a 57-cm fused-silica capillary with a buffer comprised of 0.05 M sodium deoxycholate, 0.02 M borate-phosphate buffer (pH 8.6), and 5% acetonitrile, and the wavelength for detection is 214 nm. The average recovery rate for all sweeteners and preservatives is approximately 90% with good reproducibility, and the detection limits range from 10 to 25 microg/g. Fifty preserved fruit samples are analyzed for the content of sweeteners and preservatives. The sweeteners found in 28 samples was aspartame (0.17-11.59 g/kg) or saccharin (0.09-5.64 g/kg). Benzoic acid (0.02-1.72 g/kg) and sorbic acid (0.27-1.15 g/kg) were found as preservatives in 29 samples.  (+info)

Analysis of human ouabainlike compound by micellar electrokinetic chromatography. (4/66)

In this preliminary study we have optimised micellar electrokinetic chromatography (MEKC, a form of capillary electrophoresis) to enable the chromatographic and spectral characteristics of human ouabainlike compound (OLC) to be investigated. Sera from fifty patients were combined to form a pool (100 ml) whilst urine (92.5 ml) was obtained from a normal healthy volunteer. Both samples were initially concentrated and partially purified by solid phase extraction before further purification by sequential HPLC separations. Final volumes for both extracts were 100 microl. MEKC was performed on a HP(3D) CE instrument with voltage set at 20 KV, capillary temperature at 20 degrees C, injection time 4 s, sample volume 10 nl, with detection by photodiode array. A compound was found in both serum and urine that had similar elution and spectral characteristics to authentic ouabain. We conclude that MEKC is potentially a useful tool for the analysis of human OLC.  (+info)

Correlation of the capacity factor in vesicular electrokinetic chromatography with the octanol:water partition coefficient for charged and neutral analytes. (5/66)

PURPOSE: The aim of this study was to develop a method based upon electrokinetic chromatography (EKC) using oppositely charged surfactant vesicles as a buffer modifier to estimate hydrophobicity (log P) for a range of neutral and charged compounds. METHODS: Vesicles were formed from cetyltrimethylammonium bromide (CTAB) and sodium n-octyl sulfate (SOS). The size and polydispersity of the vesicles were characterized by electron microscopy, dynamic light scattering, and pulsed-field gradient NMR (PFG-NMR). PFG-NMR was also used to determine if ion-pairing between cationic analytes and free SOS monomer occurred. The CTAB/SOS vesicles were used as a buffer modifier in capillary electrophoresis (CE). The capacity factor (log k') was calculated by determining the mobility of the analytes both in the presence and absence of vesicles. Log k' was determined for 29 neutral and charged analytes. RESULTS; There was a linear relationship between the log of capacity factor (log k') and octanol/water partition coefficient (log P) for both neutral and basic species at pH 6.0, 7.3, and 10.2. This indicated that interaction between the cation and vesicle was dominated by hydrophobic forces. At pH 4.3, the log k' values for the least hydrophobic basic analytes were higher than expected, indicating that electrostatic attraction as well as hydrophobic forces contributed to the overall interaction between the cation and vesicle. Anionic compounds could not be evaluated using this system. CONCLUSION: Vesicular electrokinetic chromatography (VEKC) using surfactant vesicles as buffer modifiers is a promising method for the estimation of hydrophobicity.  (+info)

Separation of sympathomimetic amines of abuse and related compounds by micellar electrokinetic chromatography. (6/66)

Separation of twelve sympathomimetic amines and related compounds by micellar electrokinetic chromatography (MEKC) with UV absorbance detection is described. These amines were well separated within 25 min using 50 mM sodium tetraborate solution containing 15 mM sodium dodecylsulfate (SDS) of pH 9.3 as a running solution and detected at 210 nm. MEKC was performed with an applied voltage of 13 kV at 25 degrees C using a fused-silica capillary (50 cm x 75 mm i.d.) with effective length of 37.5 cm. The detection limits of these compounds were in the range from 4 to 97 fmol/injection at a signal-to-noise ratio (S/N) of 3. The reproducibility of the method expressed as relative standard deviation (RSD) for within-day (n=6) and between-day (n=5) assays was less than 4.8 and 8.8%, respectively. The proposed method could be applied to the determination of an anorectic drug, phentermine, in Chinese tea with a detection limit of 99 microg/g (105 fmol/injection, S/N=3).  (+info)

Evaluation of variation of acteoside and three major flavonoids in wild and cultivated Scutellaria baicalensis roots by micellar electrokinetic chromatography. (7/66)

Micellar electrokinetic chromatography (MEKC) conditions were developed to analyze the constituents of Scutellariae Radix (SR) and Scutellaria baicalensis roots. Using the MEKC method, the major flavonoid constituents of baicalin, baicalein and wogonin of wild and cultivated S. baicalensis roots were compared. In a preliminary comparison of electropherogram, one special peak was found in a wild sample but not in a 2-year-cultivated one. The compound corresponding to the peak was isolated and identified as a phenylethanoid glycoside, acteoside, by comparing the 1H- and 13C-NMR spectral data with that of the authentic compound. This is the first time acteoside has been isolated from the Scutellaria genus. It could only be found in SR derived from wild S. baicalensis roots and 4-year-cultivated plants, but not in plant materials cultivated for 3 years. Applying the MEKC method established in this study, rapid and simultaneous determinations of acteoside together with 3 flavonoids in samples were achieved. The method can thus be used for the quality control of SR in a shorter analysis period than HPLC.  (+info)

Analysis method of the angiotensin-I converting enzyme inhibitory activity based on micellar electrokinetic chromatography. (8/66)

A micellar electrokinetic chromatography (MEKC) method was developed for estimating the angiotensin-I converting enzyme (ACE) inhibitory activity by separating the hippuric acid liberated in the ACE reaction mixture in the presence of an inhibitor, captopril. The hippuric acid was successfully separated and detected by MEKC with a 25 mM sodium dodecyl sulfate solution in a 25 mM phosphate-50 mM borate buffer at pH 7.0; the total analysis took about 5 min. A good linear relationship was observed between the inhibitor and the peak area of hippuric acid release. No significant difference in the ACE inhibitory activity (IC50) of captopril (an antihypertensive medicine) or autolyzed-mushrooms (functional foods) was observed between the conventional method and the MEKC method. The MEKC method was found to be a useful technique for a rapid assay of the ACE inhibitory activity.  (+info)

Abstract Capillary electrophoresis was applied to the analysis of a mixture of triazine herbicides of environmental interest. Micellar electrokinetic capillary chromatography (MECC) proved to be satisfactory for the separation of triazines, providing high efficiency in short analysis times. Several...
A system for interfacing electrochemical detection with micellar electrokinetic capillary chromatography is demonstrated. This system couples the separation column to a short length of the same column material together with a section of porous graphite tubing which forms an electrically conductive joint. The joint is immersed in a buffer reservoir together with the ground electrode of the high-power source (15 kV). The reservoir is electrically insulated from the electrochemical cell containing the carbon fibre detector. This configuration effectively separates the detector from the high separation potential applied. Amperometric detection with micellar solutions is demonstrated for a mixture of B6 vitamers on a 50 μm I.D. column. A detection limit of ca. 4 fmol is obtained. The linear dynamic range of the calibration plot is slightly over two orders of magnitude (from ca. 1 to 200 ppm). © 1991 ...
Micellar electrokinetic chromatography (MEKC), is a chromatography technique, used in analytical chemistry. It is a modification of capillary electrophoresis (CE), where the samples are separated by differential partitioning between micelles (pseudo-stationary phase) and a surrounding aqueous buffer solution (mobile phase). The basic set-up and detection methods used for MEKC are the same as those used in CE. The difference is that the solution contains a surfactant at a concentration that is greater than the critical micelle concentration (CMC). Above this concentration, surfactant monomers are in equilibrium with micelles. In most applications, MEKC is performed in open capillaries under alkaline conditions to generate a strong electroosmotic flow. Sodium dodecyl sulfate (SDS) is the most commonly used surfactant in MEKC applications. The anionic character of the sulfate groups of SDS cause the surfactant and micelles to have electrophoretic mobility that is counter to the direction of the ...
The research presented in this dissertation involves the synthesis, modification, characterization, and the application of polymeric surfactants in micellar electrokinetic chromatography (MEKC). Sodium undecenoyl-L-Leucinate (L-SUL) was synthesized and modified by use of alkali metal counterions, alcohols, and Triton X-102. Characterization of the modified poly-L-SUL was performed in order to elucidate the structural changes on the surfactants by use of four techniques. While surface tensiometry was used for the determination of the critical micelle concentration (cmc), fluorescence measurements were used for the determination of the polarity of the modified polymeric surfactants. The information about the size of the polymeric surfactants was obtained by use of pulsed field gradient-NMR (PFG-NMR). A superior chromatographic performance in MEKC was demonstrated by the modified polymeric surfactants as compared to the non-modified polymeric surfactants. A correlation between the polarity and the ...
A cyclodextrin-modified micellar electrokinetic chromatography (CD-MEKC) technique has been developed for enantioseparation of vinpocetine using an inexpensive 2-hydroxypropyl-β-CD (HP-β-CD) as the chiral selector (CS). The best chiral separation was achieved using 40 mM HP-β-CD as the CS in 50 mM phosphate buffer (pH 7.0) consisting of 40 mM sodium dodecyl sulfate (SDS) at a separation temperature and separation voltage of 25°C and 25 kV, respectively. To the authors best knowledge, this is the first CD-MEKC study able to successfully separate the four stereoisomer of vinpocetine in separation time of 9.5 min and resolution of 1.04-3.87. Chirality, 2012. © 2012 Wiley Periodicals, Inc. ...
Capillary zone electrophoresis and micellar electrokinetic chromatography, with taurodeoxycholate as micellar agent, of protein kinase A peptide substrates ...
Ge, L., Tan, S.N., Yong, J.W.H., Hua, L., Ong, E.S. (2008). Separation of cytokinin isomers with a partial filling-micellar electrokinetic chromatography-mass spectrometry approach. Electrophoresis 29 (10) : 2024-2032. [email protected] Repository. https://doi.org/10.1002/elps. ...
Catechins in green tea are known to have many beneficial health properties. Recently, it has been suggested that matcha has greater potential health benefits than other green teas. Matcha is a special powdered green tea used in the Japanese tea ceremony. However, there has been no investigation to q …
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Capillary electrokinetic chromatography is generally recognized as a versatile and robust capillary electromigration technique for the separation of enantiomers. In this mode, one or more chiral selectors are added to the background electrolyte acting as pseudostationary phases. Within the various chiral selectors that have been applied to enantioseparations in capillary electrokinetic chromatography, cyclodextrins are by far the most often used selectors because of their versatility, structural variety and commercial availability. This is reflected in the large number of applications of cyclodextrins to analytical enantioseparations that have been reported between January 2012 and July 2016, the period of time covered by this review. Many of these applications cover aspects of life sciences such as drug analysis, bioanalysis or food analysis. Despite the large number of commercially available cyclodextrins, new derivatives have been developed in order to achieve altered enantioselectivities or ...
The use of auxiliary separation mechanisms to manipulate the separation selectivity of metal complexes and organometallic species is reviewed. Auxiliary separation mechanisms included in the review are micellar electrokinetic capillary chromatography, ion-pairing and ion-exchange electrokinetic chromatography. This paper discusses how these secondary mechanisms can be effectively employed to tailor separation selectivity.. ...
Studies of the capillary zone electrophoresis (CZE) and micellar electrokinetic capillary chromatography (MEKC) behaviour of 1,4-benzodiazepines have seen application in subject areas such as the development of pharmaceuticals, therapeutic drug monitoring and forensic toxicology. In the development of pharmaceuticals, pK(a) determinations by CZE can be used in preclinical studies whereas analytical data on the detection and determination of 1,4-benzodiazepines is of value primarily in raw material/formulation assay and in the analysis of body fluids in clinical studies. The capillary electrophoresis (CE) techniques, which generally have inferior limits of detection (LOD) to rival techniques such as gas chromatography (GC) and high-performance liquid chromatography (HPLC), are particularly applicable in forensic toxicology where reasonably high concentrations of these drugs can be encountered. It is anticipated that, with the interfacing of CZE: and capillary electrochromatography (CEC) with mass ...
TY - JOUR. T1 - COMPARISON OF DIFFERENT TECHNIQUES FOR THE ANALYSIS OF METALLOTHIONEIN ISOFORMS BY CAPILLARY ELECTROPHORESIS. AU - RICHARDS, M P AU - BEATTIE, J H PY - 1995/7/7. Y1 - 1995/7/7. N2 - We have investigated free-solution capillary electrophoresis (FSCE) and micellar electrokinetic capillary chromatography (MECC) separations of metallothionein (MT) isoforms conducted in uncoated and surface-modified fused-silica capillaries. At alkaline pH, FSCE rapidly resolves isoforms belonging to the MT-1 and MT-2 charge classes. At acidic pH, additional resolution of MT isoforms is achieved. The use of high-ionic-strength (0.5 M) phosphate buffers can result in high peak efficiencies and increased resolution for some MT isoforms. Interior capillary surface coatings such as polyamine and linear polyacrylamide polymers permit separation of MT isoforms with enhanced resolution through their effects on electroosmotic flow (EOF) and protein-wall interactions. Improvements in MT isoform resolution can ...
Capillary electrophoresis (CE) comprises a family of related separation techniques in which an electric field is used to achieve the separation of components in a mixture. One of the key features of CE is the simplicity of the instrumentation required, and today, these techniques have become powerful analytical tools for high efficiency separation, and the identification of a variety of ionic and neutral compounds.. Moreover, the versatility of CE operational modes (capillary zone electrophoresis, micellar electrokinetic capillary chromatography, capillary electrochromatography, capillary isoelectric focusing, isotachophoresis, non-aqueous capillary electrophoresis, etc.) and detection systems (ultraviolet, fluorescence, amperometric, mass spectrometry…) make CE useful for applications in many fields such as environmental, food, pharmaceutical, and forensic analysis. The typcial drawback of CE techniques, based on their low sensitivity when dealing with conventional UV-detection, due to their ...
In order to adopt a general workflow for complex biological matrices with respect to a new blood-brain barrier (BBB) model, a micellar electrokinetic chromatography method has been developed. The cells forming the BBB have been cultivated in a special cell growth medium in which six drugs (acetaminophen, caffeine, carbamazepine, cimetidine, indometacin and propranolol) have been dissolved and tested for their penetration properties. The results showed good to very good accordance to the reference values. Samples were directly injected onto the capillary without any pretreatment (fused silica capillary, id: 50 μm, L: 48 cm, l: 40 cm). After method development, separations were carried out using a 60 mM borate buffer containing 200 mM of SDS at 30 kV, leading to an analysis time of less than 10 min. Between two runs the capillary was rinsed with a mixture of equal parts of running buffer and isopropanol (70% v/v), which proved to be very effective to remove matrix compounds. An appropriate choice ...
SIMON, Brigitta; HANCU, Gabriel and GYERESI, Árpád. Application of capillary electrophoresis to the simultaneous determination and stability study of four extensively used penicillin derivatives. Braz. J. Pharm. Sci. [online]. 2014, vol.50, n.3, pp.521-527. ISSN 1984-8250. http://dx.doi.org/10.1590/S1984-82502014000300010.. The applicability of capillary electrophoresis for the analysis of four extensively used penicillin derivatives (benzylpenicillin, ampicillin, amoxicillin, oxacilllin) has been studied. Because of structural similarities, the electrophoretic behavior of these derivatives is very similar; consequently an efficient separation using the conventional capillary zone electrophoresis is hard to be achieved. Their simultaneous separation was solved by using micellar electrokinetic capillary chromatography, the separation being based on the differential partition of the analytes between the micellar and aqueous phase. Using a buffer solution containing 25 mM sodium tetraborate and ...
Abstract A method for the determination of histamine, 2-phenylethylamine, tryptamine, putrescine, cadaverine, spermidine and spermine in fish using micellar electrokinetic capillary chromatography (MECC) was developed. Seven biogenic amines (BAs) were extracted from a sample with 6% perchloric acid, then derivatized with benzoyl chloride. 0.02 mol/L borate buffer (pH 9.2) containing 0.06 mol/L sodium deoxycholate-methanol (95∶5, v/v)was used as a running buffer. The detection wavelength was set at 214 nm. The separation was achieved within 12 min. Good linearities were observed from the calibration plots in the concentration ranges. The detection limit of histamine was 15 μg/g and those of the other amines were 5 μg/g. The developed method was successfully employed for the simultaneous determination of 7 BAs in fish sample with satisfactory results. ...
A method for simultaneous determination of polyamines and catecholamines in cell extracts by micellar electrokinetic capillary chromatography with UV detection at 254 nm was established at the first time. The polyamines (putrescine, spermidine and spermine) and catecholamines (dopamine, serotonin, norepinephrine and epinephrine) were extracted from PC-12 cells and were derivatized with 6-aminoquinolyl-N-hydroxysuccinimidyl carbamate. Different derivatization conditions such as temperature, ratio of derivatization reagents and incubation time were investigated to find the best reaction condition which gave the highest detection sensitivity for polyamines and catecholamines. The influence of running buffer and additives on the separation such as pH, sodium dodecyl sulfate (SDS) concentrations and various additives was also investigated. Separation was achieved within 20 min with good repeatability in a 100 mM boric acid buffer containing 10 mM SDS and 10 mM 18-crown-6 at a pH of 9.5. The detection limit
TY - JOUR. T1 - The chemical interpretation and practice of linear solvation energy relationships in chromatography. AU - Vitha, Mark. AU - Carr, Peter W.. PY - 2006/9/8. Y1 - 2006/9/8. N2 - This review focuses on the use of linear solvation energy relationships (LSERs) to understand the types and relative strength of the chemical interactions that control retention and selectivity in the various modes of chromatography ranging from gas chromatography to reversed phase and micellar electrokinetic capillary chromatography. The most recent, widely accepted symbolic representation of the LSER model, as proposed by Abraham, is given by the equationSP = c + e E + s S + a A + b B + v Vin which, SP can be any free energy related property. In chromatography, SP is most often taken as log k′ where k′ is the retention factor. The letters E, S, A, B, and V denote solute dependent input parameters that come from scales related to a solutes polarizability, dipolarity (with some contribution from ...
Mentioning: 32 - To improve the sensitivity in chiral analysis by capillary electrophoresis without loss of optical resolution, application of large-volume sample stacking with an electroosmotic flow pump (LVSEP) was investigated. Effects of the addition of cyclodextrin (CD) into a running solution on the LVSEP preconcentration was theoretically studied, where the preconcentration efficiency and effective separation length would be slightly increased if the effective electrophoretic velocity (v(ep,eff,BGS)) of the analytes was decreased by interacting with CD. In LVSEP-CD-modified capillary zone electrophoresis (CDCZE) and LVSEP-CD electrokinetic chromatography with reduced v(ep,eff,BGS), up to 1000-fold sensitivity increases were achieved with almost no loss of resolution. In LVSEP-CD-modified micellar electrokinetic chromatography of amino acids with increased v(ep,eff,BGS), a 1300-fold sensitivity increase was achieved without much loss of resolution, indicating the versatile applicability of LVSEP
Rapid determination of acyclovir in plasma and cerebrospinal fluid by micellar electrokinetic chromatography with direct sample injection. 500 mg acyclovir.Commande En Ligne Valtrex (valacyclovir) 500 Mg and Pharmacie de garde Zovirax (Acyclovir) 200 mg, Valtrex (Valacyclovir) 500 mg Canada, Acyclovir Acheter Sans.Star spare parts common rail diesel injection pump and pump injector, petrol injection and repair kits, diesel fuel filters and bearings, caterpillar, lucas, delphi.. I came to your La Saint Valentin à l hôtel Atrium: Hotel Arles,. Both the Dow andthe S&P_ 500 closed at all-time highs on Friday - for the secondday in a row.buy valacyclovir 500 mg And cold sores pain lower back amoxicillin allergic reaction in baby buy valacyclovir 500 mg does have shelf life. Is still available dose.Cialis in pakistan price, The cost of cialis and viagra. Purchase acyclovir online! Trazodone online purchase? Kamagra uk prices, Nexium overnight!.Stability of cidofovir in 0.9% sodium chloride and in ...
A double-injection micellar electrokinetic chromatography (DIMEKC) method for the identification of Æ - caprolactam and melamine deliberately added to povidone (polyvin..
A methodology for the determination of tomato phenolic acids and flavonoids has been developed combining MEKC and DAD detection. The influence on polyphenol separation of pH and background electrolyte, BGE (borax, acetonitrile, methanol and SDS concentrations), was studied and optimized using response surface methodology and weighted desirability function. Separation of polyphenols was achieved within 20 min at 15 °C using 11.3 mM borax and 11.2 mM SDS adjusted to pH 8.5 as BGE. Validation was performed using standards and tomato extracts. Recoveries ranged from 77 to 106%. Acceptable repeatabilities were obtained for peak area (%RSD ,3.1% and ,3.7%) and migration times (%RSD ,0.2% and ,1.4%) for intra- and inter-day respectively. Detection limits ranged between 0.8 and 3.8 mg kg−1. Five and seven of these polyphenols were determined in samples of tomato and related species. This methodology will be valuable tool in breeding programs, analyzing a large number of samples. [-] ...
A capacitively coupled contactless conductivity detection (CCD) system has been applied for the detection of neutral synthetic polymers in capillary size-exclusion electrokinetic chromatography (SEEC). Polystyrene standards, that were used as a model compounds, were separated on a capillary column packed with porous 10 μm silica particles with an electrokinetically driven mobile phase, and detected by CCD and UV detection simultaneously. Mass-calibration curves for polystyrene were constructed. Satisfactory results were obtained for the linearity, the run-to-run repeatability (,0.2% for the relative retention and ,4% for the peak area) and the robustness of the detector. One of the major issues in this preliminary study was to investigate the origin of the peaks observed for the polystyrene standards. The effect of the molar mass of the polystyrenes on the sensitivity was small. Therefore, the signals obtained could not be explained as the result of an increased viscosity and a decreased ...
A field-amplified sample injection-micellar electrokinetic chromatography (FASI-MEKC) method for the determination of 14 benzophenones (BPs) in a food simulant used in migration studies of food packaging materials was developed, allowing almost baseline separation in less than 21 min. The use of a 10 mM sodium dodecyl sulfate (SDS) solution as sample matrix was mandatory to achieve FASI enhancement of the analyzed BPs. A 21- to 784-fold sensitivity enhancement was achieved with FASI-MEKC, obtaining limits of detection down to 5.1-68.4 µg/L, with acceptable run-to-run precisions (RSD values lower than 22.3%) and accuracy (relative errors lower than 21.0%). Method performance was evaluated by quantifying BPs in the food simulant spiked at 500 µg/L (bellow the established specific migration limit for BP (600 µg/L) by EU legislation). For a 95% confidence level, no statistical differences were observed between found and spiked concentrations (probability at the confidence level, p value, of 0.55),
Partial filling-micellar electrokinetic chromatography optimizationstudies of ibuprofen, codeine and degradation products, and coupling tomass spectrometry: Part II. ...
Download and Read online Hyphenations Of Capillary Chromatography With Mass Spectrometry, ebooks in PDF, epub, Tuebl Mobi, Kindle Book. Get FreeHyphenations Of
Zhan, Q., Gusev, A., & Hercules, D. M. (1999). A novel interface for on-line coupling of liquid capillary chromatography with matrix-assisted laser desorption/ionization detection. Rapid Communications in Mass Spectrometry, 13(22), 2278-2283 ...
Catechins (catechin and other derivatives) are naturally occurring flavonoids present in a number of plants and foods. They are also part of numerous nutraceutical formulations because they are believed to have antioxidant, cancer chemo-preventative, anti-inflammatory and antimicrobial properties. The determ
Determination of caffeine and associated compounds in food, beverages, natural products, pharmaceuticals, and cosmetics by micellar electrokinetic capillary ...
The arrangement of the glucose units in the three different forms of cyclodextrin are shown in figure 26. The mouth of the torus-shaped cyclodextrin molecule has a larger circumference than at the base and is linked to secondary hydroxyl groups of the C2 and C3 atoms of each glucose unit (see figure 27). The primary hydroxyl groups are located at the base of the torus on the C6 atoms. As these hydroxyl groups are free to rotate, they partially block the base aperture. The size of the cavity increases with increasing number of glucose units (figure 26).The secondary hydroxyl groups can be reacted with appropriate reagents to introduce additional and different interactive character to the cyclodextrin molecule. The strong chiral selectivity of the cyclodextrins structures is thought to arise from the many chiral centers they contain (e.g., b-cyclodextrin has 35 stereogenic centers). The cyclodextrins are probably the most effective chirally selective stationary phases presently available for the ...
It is clear that the column radius is the critical property of the system, significantly effecting both the column efficiency and the analysis time. It is also seen that the contribution to dispersion from longitudinal diffusion is the same for both columns and so the striking difference between the performance of the two columns depends solely on the effect of the column radius on the resistance to mass transfer terms. This is clearly illustrated by the large difference in slopes of the two linear curves for the resistance to mass transfer shown in figure 17.. ...
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Liposome and micelle electrokinetic chromatography (EKC) were used to determine retention factors (k) that are directly related to partition coefficients (K) and the phase ratio (φ) as: k = K*φ. Linear solvation energy relationship (LSER) models were used to elucidate the contributions of solute partitioning into liposomes. In addition, an LSER model for both MEKC and LEKC was used to determine partition coefficients for solutes without observed partition coefficients. The observed partition coefficients and those determined from LSER were then used to predict partition coefficients with the group contribution approach (GCA) and the fragmental constant approach (FCA) from solute structure. In the GCA, a relatively small number of key monosubstituted aromatic and aliphatic solutes are used to determine the substituent constants of functional groups. These substituent constants as well as the contributions from aromatic and aliphatic carbon plus hydrogen are used to predict partition ...
Berezkin, V.G.; Popova, T.P.; Shiryayeva, V.Ye.; Nomura, N., Gas-chromatographic separation of monoalkylphenols on polar and non-polar phases by means of capillary chromatography, Pet. Chem. USSR (Engl. Transl.), 1997, 37, 2, 161-167. 16 matching species were found. For each matching species the following will be displayed: ...
Polyprotic molecular weight = 1003.19 for mass spectrometry analysis • Near-infrared (NIR) fluorescent dye • Solubility: Water or DMSO • Carboxylic acid available for covalent attachment • Supplied as polysodium salt • Used as a contrast agent by itself or for making optical probes for NIR fluorescence imaging. ...
Comparison if micellar elektrokinetic chromatography (MEKC) and microemulsion elektrokinetic chromatography (MEEKC) for the separation of lignin degradation compounds ...
How is the column strength affected by its slenderness?. The column slenderness is defined in terms of its slenderness ratio kLu/r, where the term kLu is called the effective length and the factor k modifies the actual column length to account for end restraints other than pinned. The value of the effective length factor k varies between 0.5 and 2.0, depending of the buckled shape of the column for different end conditions. The parameter r is the radius of gyration of the cross section.. In practice, columns are rarely found as isolated members, but they are part of rigid frames together with other structural members such as beams. When the frame is laterally braced, the joint translation is prevented by shear walls, attachment to adjoining structures, etc, and such a column is called Non-sway, as opposed to a Sway column, where the lateral stability is dependent of the stiffness of the members of the frame.. When a slender column is axially loaded, it tends to buckle, which creates a deflection ...
How is the column strength affected by its slenderness?. The column slenderness is defined in terms of its slenderness ratio kLu/r, where the term kLu is called the effective length and the factor k modifies the actual column length to account for end restraints other than pinned. The value of the effective length factor k varies between 0.5 and 2.0, depending of the buckled shape of the column for different end conditions. The parameter r is the radius of gyration of the cross section.. In practice, columns are rarely found as isolated members, but they are part of rigid frames together with other structural members such as beams. When the frame is laterally braced, the joint translation is prevented by shear walls, attachment to adjoining structures, etc, and such a column is called Non-sway, as opposed to a Sway column, where the lateral stability is dependent of the stiffness of the members of the frame.. When a slender column is axially loaded, it tends to buckle, which creates a deflection ...
本研究係應用實驗計劃法探討光纖雷射6061T6鋁合金焊接製程最佳化,選定雷射功率(Laser Power)、加工速度(Processing Speed)、脈衝頻率(Pulse Frequency)、氣體流量(Gas Flow)為焊接之製程參數,研討對接焊的焊道表面結構、斷面與拉伸強度對於製程參數之關係。首先利用反應曲面法(Response Surface Method, RSM)之中央合成設計(Central Composite Design,CCD)規劃不同的雷射加工參數組合執行實驗;同時,本研究亦藉由光學顯微鏡觀察焊道表面結構、斷面與拉伸強度之影響,最後進行數據分析與研討。藉由變異數分析(Analysis of Variance, ANOVA)了解光纖雷射對接焊之製程參數對拉伸強度的重要影響因子,並分別應用反應曲面法(Response Surface Method, RSM)之迴歸分析(Regression Analysis)統計技術,完成建構光纖雷射對接焊的製程參數與拉伸強度之反應曲面方程式(Response Surface Equation)
Capillary electrophoresis (CE) is a family of electrokinetic separation methods performed in submillimeter diameter capillaries and in micro- and nanofluidic channels. Very often, CE refers to capillary zone electrophoresis (CZE), but other electrophoretic techniques including capillary gel electrophoresis (CGE), capillary isoelectric focusing (CIEF), capillary isotachophoresis and micellar electrokinetic chromatography (MEKC) belong also to this class of methods. In CE methods, analytes migrate through electrolyte solutions under the influence of an electric field. Analytes can be separated according to ionic mobility and/or partitioning into an alternate phase via non-covalent interactions. Additionally, analytes may be concentrated or focused by means of gradients in conductivity and pH. The instrumentation needed to perform capillary electrophoresis is relatively simple. A basic schematic of a capillary electrophoresis system is shown in figure 1. The systems main components are a sample ...
Detection of drugs at low concentration is required in a variety of biological and medical situations, in order to avoid harmful side effects posed by some drug residues. The book details the instrumentation, detection, and application of nano chromatography (that is, any chromatographic and capillary electrophoretic method dealing with the detection of a sample at nano gram per liter or lower) and capillary electrophoresis in the analyses of biological and environmental samples. Methods discussed include: Nano Gas Chromatography, Nano Capillary Electrophoresis, Nano Chiral Chromatography, Micellar Electrokinetic Chromatography, Supercritical Fluid Chromatography, and Nano High Performance Liquid Chromatography.. ...
Many factors can affect the natural organic matter adsorption on clay, such as pH and ionic strength. Blended background electrolyte could be causing better simulation to natural effects. Therefore, kinetic study of humic acid (HA) adsorption onto smectite has been studied under various conditions. Impact of pH and individual and blend background electrolyte with different ionic strength concentration on the ... Read more. ...
This graph shows the total number of publications written about Capillary Electrochromatography by people in this website by year, and whether Capillary Electrochromatography was a major or minor topic of these publications ...
The separation of different ring numbered polyaromatic hydrocarbons (PAHs) was accomplished by using cetyltrimethylammonium bromide (CTAB) in capillary electrokinetic chromatography. In order to increase the solubilities and selectivities of PAHs, acetonitrile (ACN) was used as an organic modifier. Under the optimised conditions, 11 aromatic compounds were separated within 14.5 min in a running electrolyte containing 10 mM phosphate, 30 mM CTAB, and 40% ACN at pH 6.0. The effects of CTAB and ACN concentrations, voltage and pH on the resolution were investigated. Reproducibilities of migration times range between 0.55 and 1.27 R.S.D.% and peak areas between 1.02 and 7.23 R.S.D.%. Limit of detections (LODs) range between 0.09 and 2.24 mu g ml(-1). This new and fast separation method of PAHs was applied to cooked oil sample. (c) 2005 Elsevier B.V. All rights reserved. ...
Nanoparticles were used as a pseudostationary phase in capillary electrochromatography (CEC) electrospray ionisation-mass spectrometry (ESI-MS) for separation of both neutral analytes by a reversed phase mechanism, as well as for cationic analytes by a cation exchange mechanism. Nanoparticles suspended in electrolyte, were injected as a plug prior to the sample using a partial filling technique (PF), or used as electrolyte in a continuous full filling (CFF) technique. An orthogonal ESI probe was used to hinder the nanoparticles from entering the mass spectrometer and to allow detection of analytes co-eluting with concentrated nanoparticle slurries. Two types of nanoparticles were synthesised and used, both of them having a hydrophobic core and a hydrophilic surface. The hydrophobic core gave the nanoparticles reversed phase properties and the hydrophilic surface promoted the formation of stable slurries of nanoparticles in electrolytes with a low concentration of organic modifier. The surface of ...
TY - JOUR. T1 - Polyethylenimine-modified metal oxides for fabrication of packed capillary columns for capillary electrochromatography and capillary liquid chromatography. AU - Wiedmer, Susanne K.. AU - DOrazio, Giovanni. AU - Smått, Jan-Henrik. AU - Bourdin, Delphine. AU - Baños-Pérez, Clara. AU - Sakeye, Motolani. AU - Kivilompolo, Maarit. AU - Kopperi, Matias. AU - Ruiz-Jiménez, José. AU - Fanali, Salvatore. AU - Riekkola, Marja-Liisa. PY - 2011. Y1 - 2011. U2 - 10.1016/j.chroma.2010.12.071. DO - 10.1016/j.chroma.2010.12.071. M3 - Artikel. VL - 1218. SP - 5020. EP - 5029. JO - Journal of Chromatography A. JF - Journal of Chromatography A. SN - 0021-9673. IS - 30. ER - ...
Enantioseparation has attracted considerable attention in biological science and pharmaceutical industry because of the different physiological activity and pharmacological effects of different enantiomers (1). Amongst many analytical techniques, capillary electrophoresis (CE) is a relatively new separation technique that provides rapid analysis with high efficiency and resolution due to the use of electric field and a variety of selective modes (2). Cyclodextrins are the most commonly utilized chiral selectors added into the background electrolyte to perform enantioseparation. Besides neutral CDs derivatives, the synthesis and application of charged CDs derivatives have become attractive due to their good water solubility and excellent enantiorecognition abilities towards counter-charged racemic analytes (3,4). Previously, our group has developed a series of positive changed single isomer CD selectors which afforded good enantioseparation abilities to anionic and ampholytic acids by CE (5,6,7). ...
High-speed capillary electrochromatography was developed on both short and long packed columns with 2 mu m non-porous ODS as the stationary phase. Factors that affect the analysis time of samples, such as voltage, electrolyte concentration, pH and organic modifier concentration in the mobile phase, were studied systematically. Fast analysis of aromatic compounds within 13 seconds was realized with column efficiency of 573,000 plates/m and a R.S.D.% of the retention times of all components in 8 consecutive injections below 1.0%. which demonstrated the high efficiency and high reproducibility of such a technique. In addition, DNPH derived aldehydes and ketones in both standards and environmental samples were separated with high speed ...
article{350485, author = {Lynen, Frederic and BUICA, A and De Villiers, Andr{\e} and CROUCH, A and Sandra, Patrick}, issn = {1615-9306}, journal = {JOURNAL OF SEPARATION SCIENCE}, language = {eng}, number = {13}, pages = {1539--1549}, publisher = {WILEY-V C H VERLAG GMBH}, title = {An efficient slurry packing procedure for the preparation of columns applicable in capillary electrochromatography and capillary electrochromatography-electrospray-mass spectrometry}, volume = {28}, year = {2005 ...
On-Column Ion-Exchange Preconcentration of Inorganic Anions in Open Tubular Capillary Electrochromatography with Elution Using Transient-Isotachophoretic Gradients. 3. Implementation and Method Development
Félicie Denet, Willy Hauck, Roger Marc Nicoud, Orazio Di Giovanni, Marco Mazzotti, et al.. Enantioseparation through Supercritical Fluid Simulated Moving Bed (SF-SMB) Chromatography. Industrial and engineering chemistry research, American Chemical Society, 2001, 40 (21), pp.4603 - 4609. ⟨10.1021/ie000959v⟩. ⟨hal-01706022⟩ ...
Characterization of nanocrystals is crucial for the development of many chemical methods based on this technology. For this, there are several techniques, mainly microscopic, and recently capillary electrophoretic techniques, that have been proposed. In our laboratory, we examined several capillary electrophoretic methodologies: zone (CZE), micellar (MEKC), microemulsion (MEEKC), non-aqueous (NACE) and polymer based (CGE). For the separation of water soluble CdSe nanocrystals, CZE, MEKC and CGE were found to be suitable
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Expanding on Jonts explanation, the frequency of vibration is strictly proportional to the speed of sound and inversely proportional to the pipes effective length (f = c/(2*Leff)). The speed of sound depends on the properties of the gas contained in the pipe and the temperature of the gas: c = const*sqrt(T(kelvin)) = const*sqrt(273+T(celsius)) For dry air, const = 20.1, so at 20 degrees celsius c = 20.1*sqrt(273 + 20) = 344 m/s A useful approximation good for a range of temperatures around zero degrees C is c = 331.3 + 0.6*T(celsius) If the pipe were cold, at say 50 degrees F (10 degrees C), the frequency would be 337.3, according to this formula. (338.1 using the more accurate sqrt formula) When warmed to a room temperature of 20 degrees C we are back to 344 m/s. So this is an increase of about 1.8% or about 3 tenths of a semi-tone (which is approx. 5.9%). You can calculate the pitch change in cents using the formula cents_change = 3986.3*log10(f2/f1) = 3986.3*log10(sqrt((273 + Tc2)/(273 + ...
Metal tubeless tire valve stem fits all cast wheels with .327in.-.339in. holes Full-length threading for various rim thicknesses Comes with metal cap, lock nut and O-ring seal 1 3/16in. effective length
Pharmacologically Active Compounds from the Tibetan Medicine Elsholtzia with Micellar Electrokinetic Capillary Chromatography. ... Chenxu Ding; Lingyun Wang; Xianen Zhao; Yulin Li; Honglun Wang; Jinmao You; Yourui Suo , Journal of Liquid Chromatography & ... Yulin Li; Xian'en Zhao; Chenxu Ding; Honglun Wang; Yourui Suo; Guichen Chen; Jinmao You , Journal of Liquid Chromatography & ...
... capillary isoelectric focusing (CIEF), capillary isotachophoresis and micellar electrokinetic chromatography (MEKC) belong also ... "Application of micellar electrokinetic capillary chromatography to the analysis of uncharged pesticides of environmental impact ... Micellar electrophoretic capillary chromatography (MECC) has been developed and applied to the analysis of inks extracted from ... of essential and branched-chain amino acids in nutraceutical products by micellar electrokinetic capillary chromatography". ...
Injac, R.; Kočevar, N.; Kreft, S. (2007). "Precision of micellar electrokinetic capillary chromatography in the determination ... Micellar electrokinetic chromatography (MEKC) is a chromatography technique used in analytical chemistry. It is a modification ... "Application of Micellar Electrokinetic Capillary Chromatography to the Analysis of Uncharged Pesticides of Environmental Impact ... "Principles of Micellar Electrokinetic Capillary Chromatography Applied in Pharmaceutical Analysis". Advanced Pharmaceutical ...
... chromatography, micellar electrokinetic capillary MeSH E05.196.181.750 - chromatography, supercritical fluid MeSH E05.196. ... chromatography, liquid MeSH E05.196.181.400.170 - chromatography, affinity MeSH E05.196.181.400.250 - chromatography, gel MeSH ... chromatography, high pressure liquid MeSH E05.196.181.400.383 - chromatography, ion exchange MeSH E05.196.181.400.383.349 - ... chromatography, deae-cellulose MeSH E05.196.181.400.454 - chromatography, paper MeSH E05.196.181.400.454.655 - nucleotide ...
The sensitivity of conventional CEUV can be improved by using micellar electrokinetic chromatography (MEKC). CEMS has the added ... Capillary electrophoresis (CE)is emerging as the preferred analytical method for YTX analysis, as it has significant advantages ... M. Fernández Amandi; A. Furey; M. Lehane; H. Ramstad; K. J. James (2002). "Liquid chromatography with electrospray ion-trap ... Chromatographic methods with fluorescence detection Liquid chromatography with fluorescence detection (LC-FLD) provides a ...
Capillary electrochromatography. Ion chromatography. Micellar electrokinetic chromatography. Paper chromatography. Reversed- ... Affinity chromatography. Column chromatography. Displacement chromatography. Electrochromatography. Gas chromatography. High- ... phase chromatography. Size-exclusion chromatography. Thin-layer chromatography. Two-dimensional chromatography. Van Deemter ...
High-performance liquid chromatography. *Capillary electrochromatography. *Ion chromatography. *Micellar electrokinetic ... Size exclusion chromatography. Micellar liquid chromatography. Ion chromatography (or ion-exchange chromatography) separates ... Anion exchange chromatography retains anions using positively charged functional group: R-X. +. A. −. +. M. +. B. −. ⇄. R-X. + ... or in chromatography columns. Thin layer chromatography or column chromatography share similarities in that they both act ...
High-performance liquid chromatography. *Capillary electrochromatography. *Ion chromatography. *Micellar electrokinetic ... Micellar liquid chromatography. Ion chromatography (or ion-exchange chromatography) is a chromatography process that separates ... High performance liquid chromatography. Aqueous Normal Phase Chromatography. Size exclusion chromatography. ... Anion exchange chromatography retains anions using positively charged functional group: R-X. +. A. −. +. M. +. B. −. ⇄. R-X. + ...
High-performance liquid chromatography. *Capillary electrochromatography. *Ion chromatography. *Micellar electrokinetic ... Weak affinity chromatography[edit]. Weak affinity chromatography[28] (WAC) is an affinity chromatography technique for affinity ... Boronate affinity chromatography[edit]. Boronate affinity chromatography consists of using boronic acid or boronates to elute ... Lectin affinity chromatography is a form of affinity chromatography where lectins are used to separate components within the ...
High-performance liquid chromatography. *Capillary electrochromatography. *Ion chromatography. *Micellar electrokinetic ... Gas chromatography[edit]. Further information: Gas chromatography. Gas chromatography (GC), also sometimes known as gas-liquid ... Affinity chromatography[edit]. Further information: Affinity chromatography. Affinity chromatography[15] is based on selective ... Size-exclusion chromatography (SEC) is also known as gel permeation chromatography (GPC) or gel filtration chromatography and ...
High-performance liquid chromatography. *Capillary electrochromatography. *Ion chromatography. *Micellar electrokinetic ... Gas chromatography-mass spectrometry (GC-MS) is an analytical method that combines the features of gas-chromatography and mass ... Pyrolysis-gas chromatography-mass spectrometry. References[edit]. *^ O. David Sparkman; Zelda Penton; Fulton G. Kitson (17 May ... Niessen, W. M. A. (2001). Current practice of gas chromatography-mass spectrometry. New York, N.Y: Marcel Dekker. ISBN 978-0- ...
"Characterisation of retention in micellar high-performance liquid chromatography and in micellar electrokinetic chromatography ... "Micelles as separation media in high-performance liquid chromatography and high-performance capillary electrophoresis: overview ... Micellar liquid chromatography (MLC) is a form of reversed phase liquid chromatography that uses an aqueous micellar solutions ... "Micellar chromatography of inorganic compounds". Journal of Chromatography A. 780 (1-2): 343-360. doi:10.1016/S0021-9673(97) ...
High-performance liquid chromatography. *Capillary electrochromatography. *Ion chromatography. *Micellar electrokinetic ... "https://kn.wikipedia.org/w/index.php?title=ಟೆಂಪ್ಲೇಟು:Chromatography&oldid=346414" ಇಂದ ಪಡೆಯಲ್ಪಟ್ಟಿದೆ ...
"Rapid determination of piracetam in human plasma and cerebrospinal fluid by micellar electrokinetic chromatography with sample ... Piracetam has been found to diminish erythrocyte adhesion to vascular wall endothelium, making any vasospasm in the capillary ... Piracetam may facilitate the deformability of erythrocytes in capillary which is useful for cardiovascular disease. Peripheral ...
Article Separation of Steroids by Micellar Electrokinetic Capillary Chromatography. Some Physicochemical Considerations Susanne ... Separation of Steroids by Micellar Electrokinetic Capillary Chromatography. Some Physicochemical Considerations. Susanne Κ. ... "Separation of Steroids by Micellar Electrokinetic Capillary Chromatography. Some Physicochemical Considerations" Reviews in ... "Separation of Steroids by Micellar Electrokinetic Capillary Chromatography. Some Physicochemical Considerations" Reviews in ...
Capillary zone electrophoresis and micellar electrokinetic chromatography, with taurodeoxycholate as micellar agent, of protein ...
Micellar electrokinetic capillary chromatography of vitamin B6 with electrochemical detection. Journal of Chromatography A 585 ... Micellar electrokinetic capillary chromatography of vitamin B6 with electrochemical detection. Authors: Yik, Y.F.. Lee, H.K. Li ... A system for interfacing electrochemical detection with micellar electrokinetic capillary chromatography is demonstrated. This ... Amperometric detection with micellar solutions is demonstrated for a mixture of B6 vitamers on a 50 μm I.D. column. A detection ...
A non-competitive immunoassay based on micellar electrokinetic capillary chromatography (MECC) with laser-induced fluorescence ... A non-competitive immunoassay based on micellar electrokinetic capillary chromatography (MECC) with laser-induced fluorescence ... Non-competitive immunoassay for alpha-fetoprotein using micellar electrokinetic capillary chromatography and laser-induced ... Non-competitive immunoassay for alpha-fetoprotein using micellar electrokinetic capillary chromatography and laser-induced ...
Micellar electrokinetic capillary chromatography (MECC) proved to be satisfactory for the separation of triazines, providing ... Abstract Capillary electrophoresis was applied to the analysis of a mixture of triazine herbicides of environmental interest. ... Determination of triazine herbicides in water by micellar electrokinetic capillary chromatography Carabias Martí 관련메뉴. ; nez, R ... Micellar electrokinetic capillary chromatography (MECC) proved to be satisfactory for the separation of triazines, providing ...
In this study we use capillary zone electrophoresis (CZE) and micellar electrokinetic capillary chromatography (MECC) in order ... In this study we use capillary zone electrophoresis (CZE) and micellar electrokinetic capillary chromatography (MECC) in order ... In this study we use capillary zone electrophoresis (CZE) and micellar electrokinetic capillary chromatography (MECC) in order ... In this study we use capillary zone electrophoresis (CZE) and micellar electrokinetic capillary chromatography (MECC) in order ...
Micellar electrokinetic chromatography is a modified version of capillary electrophoresis which is used to separate a wide ... Capillary Electrophoresis. Play. Micellar electrokinetic electrophoresis. Although micellar electrokinetic electrophoresis was ... Micellar electrokinetic chromatography is a modified version of capillary electrophoresis which is used to separate a wide ... Micellar electrokinetic chromatography was developed because conventional chromatography methods did not separate molecules ...
Analysis of pilocarpine and its degradation products by micellar electrokinetic capillary chromatography ... Analysis of pilocarpine and its degradation products by micellar electrokinetic capillary chromatography. ... Analysis of pilocarpine and its degradation products by micellar electrokinetic capillary chromatography. Pharmaceutical ...
... , about ". micellar electrokinetic capillary chromatography (MECC); biogenic amines; fish ... Key words: micellar electrokinetic capillary chromatography (MECC) biogenic amines fish Received: 2007-06-12; Published: 2007- ... Determination of Seven Biogenic Amines in Fish Using Micellar Electrokinetic Capillary Chromatography ... Determination of Seven Biogenic Amines in Fish Using Micellar Electrokinetic Capillary Chromatography ...
Capillary electrophoresis and electrochromatography are performed in channels formed in the substrate. Analytes are loaded into ... micellar electrokinetic capillary chromatography (MECC), inorganic ion analysis, and gradient elution liquid chromatography, as ... Micellar Electrokinetic Capillary Chromatography. In the electrochromatography experiments discussed above with respect to FIG ... 20 shows a chromatogram of coumarins resulting from micellar electrokinetic capillary chromatography using the system of FIG. ...
... of chemical processes at single bovine adrenergic chromaffin cells with micellar electrokinetic capillary chromatography and ...
Chromatography, Micellar Electrokinetic Capillary / methods* * Reference Standards * Tea / chemistry* Substances * Tea * ... Determination of catechins in matcha green tea by micellar electrokinetic chromatography J Chromatogr A. 2003 Sep 5;1011(1-2): ... have developed a rapid method of analysis of five catechins and caffeine in matcha using micellar electrokinetic chromatography ...
Practical analysis of alpha acids by liquid chromatography 16.7. Micellar electrokinetic capillary chromatography 16.8. ... Liquid chromatography 18.3. Specific research possibilities for liquid chromatography 18.4. Capillary electrophoresis (CE) 18.5 ... and several on the high-efficiency liquid chromatography of hop bitter acids.. Bearing in mind the lack of literature produced ...
15.6 Capillary Zone Electrophoresis; an Example 221. 15.7 Micellar Electrokinetic Chromatography 222 ... and on electrokinetic separation methods. SPB has published more than 90 papers in international journals, given more than 65 ...
... and cosmetics by micellar electrokinetic capillary chromatography. dc.creator. Injac, Rade. ... and cosmetics by micellar electrokinetic capillary chromatography. en. ...
T1 - Use of high-conductivity sample solution with sweeping-micellar electrokinetic capillary chromatography for trace-level ... Use of high-conductivity sample solution with sweeping-micellar electrokinetic capillary chromatography for trace-level ... Use of high-conductivity sample solution with sweeping-micellar electrokinetic capillary chromatography for trace-level ... Use of high-conductivity sample solution with sweeping-micellar electrokinetic capillary chromatography for trace-level ...
p,,b,AIM,/b,To develop a rapid and feasible method based on micellar electrokinetic capillary chromatography (MECC) for the ... Anticonvulsants , Blood , Buffers , Carbamazepine , Blood , Chromatography, Micellar Electrokinetic Capillary , Methods , ... Rapid analysis of antiepileptic drugs in human plasma by micellar electrokinetic capillary chromatography / 药学学报 ... Rapid analysis of antiepileptic drugs in human plasma by micellar electrokinetic capillary ...
Mixed micelles of sodium dodecyl sulfate and sodium cholate: micellar electrokinetic capillary chromatography and nuclear ... Mixed micelles of sodium dodecyl sulfate and sodium cholate : micellar electrokinetic capillary chromatography and nuclear ... title = "Mixed micelles of sodium dodecyl sulfate and sodium cholate: micellar electrokinetic capillary chromatography and ... Mixed micelles of sodium dodecyl sulfate and sodium cholate : micellar electrokinetic capillary chromatography and nuclear ...
Determination of benzodiazepines in human whole blood by micellar electrokinetic capillary chromatography / 中国法医学杂志 ... Micellar electrokinetic capillary chromatography.Methods With the Clenbuterol as internal standard,Oasis column was used to ... Determination of benzodiazepines in human whole blood by micellar electrokinetic capillary ... extract the drugs from whole blood.The separation was performed on a fused-silica capillary of 75?m ID?50.2cm(40cm of effect ...
Although capillary electrophoresis (CE) technology has evolved quickly from the research laboratory into practical application ... Protein Analysis by Capillary Electrophoresis, J.M. Hempe Micellar Electrokinetic Chromatography, S. Terabe Capillary ... Part IIA Capillary-Based Systems: Core Methods and Technologies Kinetic Capillary Electrophoresis, M.V. Berezovski and S.N. ... Isoelectric Focusing in Capillary Systems, J.W. T. Huang, and J. Pawliszyn Part IIB Capillary-Based Systems: Specialized ...
Usage of a multiplex system allows the simultaneous measurement with 96 capillaries. A 96-multiplexed capillary electrophoresis ... Capillary electrophoresis with a universal UV-based product detection is a promising analytical tool to quantify product ... Principles of Micellar Electrokinetic Capillary Chromatography Applied in Pharmaceutical Analysis. Adv. Pharm. Bull. 3, 1-8, ... micellar electrokinetic chromatography; MEKC)29, microemulsions (microemulsion electrokinetic chromatography; MEEKC)30, the use ...
Micellar electrokinetic chromatography (MEKC) for neutral and=or charged drugs. Microemulsion electrokinetic chromatography ( ... Capillary electrochromatography (CEC) (C.J. Paterson, R.J. Boughtflower). Introduction. Basic principles of capillary ... Application of standard methods in capillary electrophoresis for drug analysis (K. Altria). Introduction to capillary ... Basis and pharmaceutical applications of thin-layer chromatography (H. Kalász, M. Báthori). Planar chromatography. The ...
Chromatography, Micellar Electrokinetic Capillary. A hybrid separation technique combining both chromatographic and ... Correlation of micellar aggregation - complexation regimes to discern stability of micellar structure and nano-encapsulation. ... Increasing the Oral Bioavailability of 6-prenylnaringenin by Micellar Solubilization. Micellar encapsulation will be tested to ... To test this, we study the light-activated proton pump proteorhodopsin (PR) in micellar surfactant solutions because it is ...
This subtechnique of capillary electrophoresis is termed micellar electrokinetic chromatography.. "Electrophoresis" is ... Capillary bridge in apparatus for determining ionic activity. US4952266. 8 Sep 1988. 28 Ago 1990. Fuji Photo Film Co., Ltd.. ... Capillary electrophoresis device. US8535536 *. 2 Jul 2010. 17 Sep 2013. University Of Utah Research Foundation. Cross-flow ... Channels of capillary dimension typically have an inside bore diameter ("ID") of from about 10 to 200 microns, more typically ...
... of polyethylene glycols and polypropylene glycols by capillary zone electrophoresis and micellar electrokinetic chromatography ... Bost RO, Sunshine I [ 1980]. Ethylene-glycol analysis by gas-chromatography. J Anal Toxicol 4(2):102-103.Cao XL, Zhu J [2001]. ... OSHA Salt Lake City, UT: U.S. Department of Labor, OSHA Salt Lake Technical Center, Chromatography Team. ... 3-butylene glycol in human serum and urine by wide-bore column gas chromatography. J Chromatogr B: Biomed Appl 619(2):251-257. ...
Capillary Electrophoresis (CE) has had a very significant impact on the field of analytical chemistry in recent years as the ... Micellar Electrokinetic Capillary Chromatography. Inclusion Pseudophases. Metal-complexing Pseudophases. Other Types of ... Capillary Electrophoresis (CE) has had a very significant impact on the field of analytical chemistry in recent years as the ... 7. Applications of Capillary Electrophoresis. Biomolecules. Pharmaceutical and Clinical Analysis. Inorganic Ions. Hydrocarbons ...
Micellar Electrokinetic Chromatography (MEKC) 31. IEF 31. Capillary Electro Chromatography (CEC) 31. Capillary Isotachophoresis ... CAPILLARY ELECTROPHORESIS 30. Capillary Zone Electrophoresis (CZE) 30. Capillary Gel Electrophoresis (CGE) 30. ... Chromatography 21. RAPID DNA ELECTROPHORETIC SEPARATION METHOD 21. FOURIER TRANSFORM CAPILLARY ELECTROPHORESIS 22. HORIZONTAL ... CAPILLARY ISOELECTRIC FOCUSING (CIEF) FOR STUDYING CELLULAR. MICROORGANISMS 24. A NOVEL CE TECHNOLOGY PLATFORM 25. CHAPTER 5 ...
Publications] Hiroto Ozaki, et al.: Micellar electrokinetic chromatography-mass spectrometry using a high-molecular-mass ... Publications] Kiyohiro Koezuka: Separation and detection of closely related peptides by micellar electrokinetic chromatography ... Publications] Kiyohiro Koezuka: Separation and detection of closely related peptides by micellar electrokinetic chromatography ... MICELLAR ELECTROKINETIC CHROMATOGRAPHY / カフェイン / 胆汁酸塩. Research Abstract. A Hitachi M-1000 quadrupole mass spectrometer ...
  • In the present work, we isolated two bioactive diterpenoids, horminone and 7-O-acetylhorminone and developed a micellar electrokinetic chromatography (MEKC) method for the simultaneous quantitative analysis of them in Turkish Salvia Species. (bezmialem.edu.tr)
  • The micelle-micelle and micelle-buffer interactions in an SDS/SC/[(1,1-dimethyl-2-hydroxyethyl)amino]-2-hydroxypropanesulfonic acid buffer system for separations by micellar electrokinetic capillary chromatography (MEKC) were studied by capillary electrophoresis (CE) and nuclear magnetic resonance (NMR) techniques. (edu.au)
  • A mixed micellar system of SDS and SC can effectively be used for the separation by MEKC of highly hydrophobic compounds like corticosteroids. (edu.au)
  • Very often, CE refers to capillary zone electrophoresis (CZE), but other electrophoretic techniques including capillary gel electrophoresis (CGE), capillary isoelectric focusing (CIEF), capillary isotachophoresis and micellar electrokinetic chromatography (MEKC) belong also to this class of methods. (wikipedia.org)
  • Micellar electrokinetic chromatography (MEKC) for neutral and=or charged drugs. (elsevier.com)
  • Micellar electrokinetic chromatography (MEKC) is a chromatography technique used in analytical chemistry. (wikipedia.org)
  • In most applications, MEKC is performed in open capillaries under alkaline conditions to generate a strong electroosmotic flow. (wikipedia.org)
  • Different CE separation formats, including capillary zone electrophoresis (CZE), capillary isoelectric focusing (CIEF), capillary isotachophoresis (CITP), capillary gel electrophoresis (CGE), and micellar electrokinetic chromatography (MEKC), are presented for different types of applications, such as the analysis of glycoforms, the separation of enantiomers, and the resolution of oligosaccharides. (springer.com)
  • CE was used in the Capillary Zone Electrophoresis (CZE) and Micellar Electrokinetic Chromatography (MEKC) mode with different internal stacking techniques. (hu-berlin.de)
  • However by use of micellar electrokinetic chromatography (MEKC) the spectrum of analytes can be extended to neutral and/or unpolar substances. (fz-juelich.de)
  • In this paper, we propose a method for separation and determination of water-soluble vitamins using capillary electrophoresis method in micellar electrokinetic chromatography (MEKC). (usp.br)
  • Studies have been performed to evaluate the use of micellar electrokinetic chromatography (MEKC), one mode of capillary electrophoresis (CE), as an analytical technique in industrial pharmaceutical analysis. (dissertations.se)
  • Analytical methods reported mainly include thin layer chromatography (TLC) (6), high-speed counter current chromatography (HSCCC) (7, 8), micellar electro kinetic chromatography (MEKC) (9), capillary zone electrophoresis (CZE) (10), high-performance liquid chromatography (HPLC) (11-13) and ultra-performance liquid chromatography (UPLC) (14). (deepdyve.com)
  • A simple, rapid and reproducible stability-indicating micellar electrokinetic chromatography (MEKC) method was developed and validated for analysis of flucloxacillin sodium in capsules, using nimesulide as internal standard. (eurekaselect.com)
  • Analysis of toxaphene and its eight congeners in sediment and fish tissue by gas chromatography-negative ion mass spectrometry [J]. Chinese Journal of Chromatography, 2013, 31(7): 667-673. (chrom-china.com)
  • Determination of 6 antiestrogens in fish tissues by ultra performance liquid chromatography-tandem mass spectrometry [J]. Chinese Journal of Chromatography, 2011, 29(11): 1055-1061. (chrom-china.com)
  • Determination of polybrominated diphenyl ethers and dechloraneplus in fish and fish oil supplements by gel permeation chromatography coupled with gas chromatography-negative chemical ionization mass spectrometry [J]. Chinese Journal of Chromatography, 2011, 29(06): 543-548. (chrom-china.com)
  • Capillary electrophoresis was first combined with mass spectrometry by Richard D. Smith and coworkers, and provides extremely high sensitivity for the analysis of very small sample sizes. (wikipedia.org)
  • Coupled chromatography-mass spectrometry techniques for the analysis of combinatorial libraries (S. Lane). (elsevier.com)
  • A Hitachi M-1000 quadrupole mass spectrometer equipped with atmospheric pressure chemical ionization (APCI) interface and electrospray ionization (ESI) interface was employed to develop a direct coupling method of capillary electrophoresis (CE) and mass spectrometry (MS). The APCI interface consisted of an electrospray nebulizer nozzle, a vaporizer and a chemical ionization chamber having a corona discharge electrode. (nii.ac.jp)
  • Publications] Kiyohiro Koezuka: 'Separation and detection of closely related peptides by micellar electrokinetic chromatography coupled with electrospray ionization mass spectrometry using the partial filling technique' Journal of Chromatography B. 689. (nii.ac.jp)
  • Publications] Hiroto Ozaki: 'Micellar electrokinetic chromatogarphy-mass spectrometry using a high-molecular-mass surfactant.On-line coupling with an electrospray ionization interface' Journal of Chromatography A. 716. (nii.ac.jp)
  • Micellar electrokinetic chromatography-mass spectrometry using a high-molecular-mass surfactant. (nii.ac.jp)
  • Rapid measurement of 8-oxo-7,8-dihydro-2'-deoxyguanosine in human biological matrices using ultra high performance liquid chromatography tandem mass spectrometry. (dmu.ac.uk)
  • Many of these developments have focused on the coupling of capillary electrophoresis (CE), a separation technique with low sample consumption and high resolving power, and mass spectrometry (MS), a sensitive detection method for interrogating all ions in a sample in a single analysis. (mdpi.com)
  • Application of Micropellicular Poly-styrene/divinylbenzene Stationary Phases for High-Performance Liquid Chromatography Electrospray-Mass Spectrometry of Proteins and Peptides. (uni-salzburg.at)
  • Analytical techniques - colour tests and spectrophotometry, chromatography and electro-phoresis, mass spectrometry, and immunoassay are covered in depth, and a chapter is devoted to the analysis of trace elements and toxic metals. (whsmith.co.uk)
  • Different selective and specific analysis procedures were developed for the determination of phenol derivatives, in particular alkylphenols, in environmental relevant matrices using High-Performance Liquid Chromatography - Mass Spectrometry (HPLC-MS), High-Performance Liquid Chromatography- Nuclear-Magnetic Resonance Spectrometry (HPLC-NMR), Gas Chromatography- Mass Spectrometry (GC-MS) and Capillary Electrophoresis (CE). (hu-berlin.de)
  • The β-blockers metoprolol and acebutolol in plasma samples were extracted and detected online using Carbon-MEPS syringe and liquid chromatography and tandem mass spectrometry (LC-MS/MS). Factors affecting the MEPS performance such as conditioning, washing and elution solutions were investigated. (diva-portal.org)
  • On the basis of liquid chromatography coupled with triple quadrupole mass spectrometry working in multiple reaction monitoring mode, an analytical method has been established to simultaneously determine flavonol glycosides, terpene lactones, biflavones, proanthocyanidins, and ginkgolic acids in Ginkgo biloba leaves. (hindawi.com)
  • A method has been developed for the determination of ribavirin in human serum for therapeutic drug monitoring purposes, using liquid chromatography electrospray ionization mass spectrometry. (infona.pl)
  • Asymmetric flow field flow fractionation (AsFlFFF) was combined with pyrolysis-gas chromatography mass spectrometry for a sized based fractionation and a detailed compositional study of the triglycerides and cholesterol associated with the various lipoprotein subclasses present in human serum. (infona.pl)
  • Amundsen LK, Kokkonen JT, Rovio S & Sirén H. (2004) Analysis of anabolic steroids by partial filling micellar electrokinetic capillary chromatography and electrospray mass spectrometry. (abo.fi)
  • Gergov M, Weinmann W, Meriluoto J, Uusitalo J & Ojanperä I. (2004) Comparison of product ion spectra obtained by liquid chromatography/triple-quadrupole mass spectrometry for library search - Rapid Communications in Mass Spectrometry 18: 1039-1046. (abo.fi)
  • A standard instrument consists of the following components: a high voltage power supply that can supply up to 30kV, silica capillary coated with polyimide externally with a diameter of 20-200 µm, two buffer reservoirs, two electrodes connected to the power source, and an ultra violet detector. (news-medical.net)
  • Detection at 210 nm, run at 25 kV at 30 degrees C in a untreated fused silica capillary (50/45.5 cm length, 50 microm ID ). (bvsalud.org)
  • A 50 μm fused silica capillary (56 cm effective length) was used to carry out all separations. (nih.gov)
  • CE deploys a liquid separation technique using narrow bore, fused, silica capillaries to fractionate molecules. (prnewswire.com)
  • The elementary parts of a CE system are a high voltage power supply, a source and destination vial, a fused silica capillary, electrodes and a detector. (fz-juelich.de)
  • Here, micellar electrokinetic chromatography using a fused silica capillary was used for analysis of the methanolic extract of Philippine lagundi herbal products. (ateneo.edu)
  • The separation was performed in a fused silica capillary of 50 cm under potential of 20 kV at a temperature of 22 ° C and monitored at 200, 254 and 270 nm. (usp.br)
  • The utility of liposomes in CE was further extended by developing a novel procedure for immobilising liposomes inside fused silica capillaries. (diva-portal.org)
  • The separations were performed in 89 mM phosphate buffer (pH 7.4) containing 52 mM sodium dodecyl sulfate (SDS) in fused silica capillaries with UV absorption detection at 200 nm. (omicsonline.org)
  • Silica gel and alumina are the most frequently used adsorbents in high performance liquid chromatography (HPLC). (chromatographyonline.com)
  • 8. The system of claim 7, wherein the column is a fused-silica capillary separation column electrokinetically packed with a high-performance liquid-chromatography stationary phase. (freepatentsonline.com)
  • The three analytes can be well separated within 11 min in a 40-cm-long fused-silica capillary at a separation voltage of 15 kV in 50 mM borate buffer (pH 9.2). (ebscohost.com)
  • A non-competitive immunoassay based on micellar electrokinetic capillary chromatography (MECC) with laser-induced fluorescence (LIF) detection has been developed for the determination of alpha-fetoprotein (AFP). (semanticscholar.org)
  • Micellar electrokinetic capillary chromatography (MECC) proved to be satisfactory for the separation of triazines, providing high efficiency in short analysis times. (ndsl.kr)
  • In this study we use capillary zone electrophoresis (CZE) and micellar electrokinetic capillary chromatography (MECC) in order to determine these free radical products. (tue.nl)
  • A method for the determination of histamine, 2-phenylethylamine, tryptamine, putrescine, cadaverine, spermidine and spermine in fish using micellar electrokinetic capillary chromatography (MECC) was developed. (chrom-china.com)
  • To develop a rapid and feasible method based on micellar electrokinetic capillary chromatography ( MECC ) for the simultaneous determination of antiepileptic drugs (AEDs)-- phenytoin (PHT), phenobarbital (PB), carbamazepine (CBZ), primidone (PRM) and clonazepam (CZP) in human plasma . (bvsalud.org)
  • Free solution capillary electrophoresis (FSCE) and micellar electrokinetic capillary chromatography (MECC) methods were developed using standard compounds. (usu.edu)
  • Non-competitive immunoassay for alpha-fetoprotein using micellar electrokinetic capillary chromatography and laser-induced fluorescence detection. (semanticscholar.org)
  • Capillary electrophoresis with a universal UV-based product detection is a promising analytical tool to quantify product formation. (nature.com)
  • Certain aspects of the instrumentation (such as detection) are necessarily more complex than for a single-capillary system, but the fundamental principles of design and operation are similar to those shown in Figure 1. (wikipedia.org)
  • Separation by capillary electrophoresis can be detected by several detection devices. (wikipedia.org)
  • In these systems, a section of the capillary itself is used as the detection cell. (wikipedia.org)
  • The portion of the capillary used for UV detection, however, must be optically transparent. (wikipedia.org)
  • The path length of the detection cell in capillary electrophoresis (~ 50 micrometers) is far less than that of a traditional UV cell (~ 1 cm). (wikipedia.org)
  • Separation was performed at 22 kV (positive polarity), with a capillary temperature of 25°C and detection at 200 nm. (nih.gov)
  • Analysis of beer iso-a-acids by micellar electrokinetic chromatography and multi-wavelength UV-detection. (ugent.be)
  • Capillary zone electrophoretic analysis of carbohydrates by direct and indirect UV-detection. (uni-salzburg.at)
  • Synthesis of a Polymeric-Based Stationary Phase for Carbohydrate Separation by High-pH Anion-Exchange Chromatography with Pulsed Amperometric Detection. (uni-salzburg.at)
  • High-Performance Anion-Exchange Chromatography of Carbohydrates Using a New Resin and Pulsed Amperometric Detection. (uni-salzburg.at)
  • Detection of Partial Denaturation in AT-Rich DNA Fragments by Ion-Pair Reversed-Phase Chromatography. (uni-salzburg.at)
  • A simple, inexpensive and reliable method for the simultaneous, routine analysis of riboflavin in actual samples: urine, beer, and mushroom by capillary electrophoresis-blue light emitting diode (LED)-induced fluorescence detection combined with stacking and velocity-difference induced focusing by using a dynamic pH junction techniques. (ncl.edu.tw)
  • The book details the instrumentation, detection, and application of nano chromatography (that is, any chromatographic and capillary electrophoretic method dealing with the detection of a sample at nano gram per liter or lower) and capillary electrophoresis in the analyses of biological and environmental samples. (separationsnow.com)
  • Capillary electrophoresis with electrochemical detection has been employed for the determination of p-hydroxyacetophenone, chlorogenic acid, and caffeic acid in Herba Artemisiae Scopariae (the dried sprout of Artemisia scoparia Waldst. (ebscohost.com)
  • Detection of Chlorogenic Acid in Honeysuckle Using Infrared-Assisted Extraction Followed by Capillary Electrophoresis with UV Detector. (ebscohost.com)
  • Determination of uric acid in human saliva by capillary electrophoresis with electrochemical detection: potential application in fast diagnosis of gout. (ebscohost.com)
  • Determination of Phenolic Acetophenones in Radix Cynanchi Paniculati by Capillary Electrophoresis with Electrochemical Detection. (ebscohost.com)
  • Capillary electrophoresis with electrochemical detection has been employed for the determination of three phenolic acetophenones (including paeonol, p-hydroxyacetophenone and 2,4-hydroxyacetophenone) in Radix Cynanchi Paniculati (i.e. (ebscohost.com)
  • Determination of five hormone drug residues in fish tissue by high performance liquid chromatography with gel permeation chromatographic clean-up [J]. Chinese Journal of Chromatography, 2010, 28(4): 388-392. (chrom-china.com)
  • Determination of five biogenic amines in source water by ion chromatography [J]. Chinese Journal of Chromatography, 2009, 27(4): 505-508. (chrom-china.com)
  • Objective To develop a method for simultaneous determination of benzodiazepines in human whole blood by SPE- Micellar electrokinetic capillary chromatography . (bvsalud.org)
  • Capillary Electrophoretic Determination of the Component Monosaccharides in Hemicelluloses. (uni-salzburg.at)
  • Ion-Exchange Chromatography with an Oxalic Acid-Hydroxyisobutyric Acid Eluent for the Separation and Determination of Rare Earth Elements in Monazite and Xenotime. (uni-salzburg.at)
  • Thus, the review focuses on recent advancements of various separation techniques like chromatography and electrophoresis that are concernd with the determination of selective serotonin reuptake inhibitor and selective norepinephrine reuptake inhibitor drugs and their metabolites in various biological matrices. (hindawi.com)
  • In this work a simple high-performance liquid chromatography coupled with diode array detector (HPLC-DAD) method was established for determination of flavonoids (shown in Physique 1) fromP. (cylch.org)
  • Separation and Determination of Three Phenylpropanoids in the Traditional Chinese Medicine and Its Preparations by Capillary Electrophoresis. (ebscohost.com)
  • This thesis deals with the development of a micellar electrokinetic chromatography method for the determination of indomethacin impurities (4-chlorobenzoic acid, 5-methoxy-2-methyl-3-indolylacetic acid and 3,4-dichloroindomethacin). (cuni.cz)
  • Since then, different methods of electrophoresis have been developed, including electrophoresis in narrow capillaries, which have a diameter of 25-100 µm. (news-medical.net)
  • Micellar electrokinetic chromatography was developed because conventional chromatography methods did not separate molecules that have a neutral charge. (news-medical.net)
  • SPB has specialized in analytical micro extraction technologies, on development and applications of artificial liquid membranes, and on electrokinetic separation methods. (wiley.com)
  • The mixed micellar system was further characterized by NMR methods. (edu.au)
  • Capillary electrophoresis (CE) is a family of electrokinetic separation methods performed in submillimeter diameter capillaries and in micro- and nanofluidic channels. (wikipedia.org)
  • Application of standard methods in capillary electrophoresis for drug analysis (K. Altria). (elsevier.com)
  • Clinical Applications of Capillary Electrophoresis demonstrates clearly the simplicity, versatility, and power of CE over conventional methods. (springer.com)
  • Capillary electrophoresis (CE) is a powerful, well-established analytical technique that provides numerous valuable benefits over other separation methods including high-performance liquid chromatography. (intechopen.com)
  • This paper describes methods for solid phase extraction and high performance liquid chromatography (HPLC). (unt.edu)
  • Methods discussed include: Nano Gas Chromatography, Nano Capillary Electrophoresis, Nano Chiral Chromatography, Micellar Electrokinetic Chromatography, Supercritical Fluid Chromatography, and Nano High Performance Liquid Chromatography. (separationsnow.com)
  • Capillary electrochromatography immunoassay for alpha-fetoprotein based on poly(guanidinium ionic liquid) monolithic material. (semanticscholar.org)
  • Capillary electrophoresis and electrochromatography are performed in channels formed in the substrate. (google.com)
  • Capillary electrochromatography (CEC) (C.J. Paterson, R.J. Boughtflower). (elsevier.com)
  • Basic principles of capillary electrochromatography. (elsevier.com)
  • Capillary Electrochromatography with Gradient Elution. (uni-salzburg.at)
  • Capillary electrophoresis is again segmented into micellar electrokinetic capillary chromatography, capillary isoelectric focusing, capillary isotachophoresis and others. (medgadget.com)
  • Capillary Electrophoresis (CE) has had a very significant impact on the field of analytical chemistry in recent years as the technique is capable of very high resolution separations, requiring only small amounts of samples and reagents. (researchandmarkets.com)
  • Moore, A.W. Jr, Jacobson, S.C. & Ramsey, J.M. Microchip separations of neutral species via micellar electrokinetic capillary chromatography. (nature.com)
  • In Clinical Applications of Capillary Electrophoresis, Stephen Palfrey brings together for first time a collection of detailed capillary electrophoresis protocols designed exclusively for clinical applications. (springer.com)
  • Although micellar electrokinetic electrophoresis was initially used to separate neutral compounds, as it separates both neutral and charged compound with equal electrophoretic abilities, it is used for both now. (news-medical.net)
  • The analytes separate as they migrate due to their electrophoretic mobility, and are detected near the outlet end of the capillary. (wikipedia.org)
  • The retention time of a solute should then be within the range: t M ≤ t r ≤ t c {\displaystyle t_{M}\leq t_{r}\leq t_{c}} Charged analytes have a more complex interaction in the capillary because they exhibit electrophoretic mobility, engage in electrostatic interactions with the micelle, and participate in hydrophobic partitioning. (wikipedia.org)
  • Differences in the electrophoretic mobilities of different molecules cause the fractions of the sample to emerge separated at the outlet end of the capillary tube. (google.com)
  • Despite the very small sample sizes (typically only a few nanoliters of liquid are introduced into the capillary), high sensitivity and sharp peaks are achieved in part due to injection strategies that result in concentration of analytes into a narrow zone near the inlet of the capillary. (wikipedia.org)
  • It is a modification of capillary electrophoresis (CE), extending its functionality to neutral analytes, where the samples are separated by differential partitioning between micelles (pseudo-stationary phase) and a surrounding aqueous buffer solution (mobile phase). (wikipedia.org)
  • Short-chain alcohols or acetonitrile can be used as organic modifiers that decrease t M {\displaystyle t_{M}} and k 1 {\displaystyle k^{1}} to improve the resolution of analytes that co-elute with the micellar phase. (wikipedia.org)
  • Their simultaneous separation was solved by using micellar electrokinetic capillary chromatography, the separation being based on the differential partition of the analytes between the micellar and aqueous phase. (scielo.br)
  • Utilising advanced molecular descriptors, commonly applied to in silico prediction of passive intestinal membrane permeability, migration of analytes in micellar CE systems could be well predicted. (diva-portal.org)
  • The novel approach was based on hierarchical multivariate analytics and use of molecular descriptors for both analytes and micellar media surfactants. (diva-portal.org)
  • The analytes were detected at the cathodic end of the capillary at 224 nm. (cuni.cz)
  • In conventional chromatography, separation of similar compounds can be improved by gradient elution. (wikipedia.org)
  • The conventional capillary zone electrophoresis (CZE) is limited to the separation of ionic compounds. (fz-juelich.de)
  • Between two runs the capillary was rinsed with a mixture of equal parts of running buffer and isopropanol (70% v/v), which proved to be very effective to remove matrix compounds. (wiley.com)
  • electrolyte compounds of Basic Pharmaceutical Drugs by Micellar Electrokinetic Chromatography thickening a Chiral Surfactant, N-Dodecoxycarbonylvaline. (elitebath.com)
  • living previous pages of Micellar Solubilization of Chiral Pharmaceutical Compounds in particular practices of N-Dodecoxycarbonylvaline Engineering Micellar Electrokinetic Chromatography. (elitebath.com)
  • On-line coupling with an electrospray ionization interface' Journal of Chromatography A. 716. (nii.ac.jp)
  • In reversed-phase liquid chromatography (LC), the A solvent typically is water or a water-rich mixture. (chromatographyonline.com)
  • Then, both parts of the capillary and electrodes are kept in the buffer and voltage is applied to begin the process of electrophoresis. (news-medical.net)
  • The system's main components are a sample vial, source and destination vials, a capillary, electrodes, a high voltage power supply, a detector, and a data output and handling device. (wikipedia.org)
  • Micellar electrokinetic electrophoresis is based on the analyte partitioning between the aqueous and micellar phase. (news-medical.net)
  • The source vial, destination vial and capillary are filled with an electrolyte such as an aqueous buffer solution. (wikipedia.org)
  • Several types of reduction reactions in organic synthesis run under aqueous micellar catalysis conditions (i.e., in water at ambient temperatures) produce significant volumes of foam due to the combin. (bioportfolio.com)
  • Micellar electrokinetic chromatography is a modified version of capillary electrophoresis which is used to separate a wide range of molecules, from inorganic ions to large biopolymers. (news-medical.net)
  • To resolve this problem, charged surfactants, consisting of a hydrophobic portion connected to a water-soluble functional group, that are above their critical micellar concentration, are added in the capillary electrophoresis buffer to separate the uncharged molecules. (news-medical.net)
  • The capillary tube in which the electrophoresis is performed has been flared, at least at its sample entrance end, to remove sharp corners which contribute to aberrations in the electric field distribution in a radial direction and result in differential migration of molecules depending on their proximity to the sharp corners. (google.com)
  • Capillary Electrophoresis (CE) was explored as a means for physicochemical and biopharmaceutical characterisation of small drug molecules. (diva-portal.org)
  • 4. The method of claim 1 wherein said separating nucleic acid molecules comprises capillary electrophoresis. (google.ca)
  • Thin-layer chromatography (TLC) is commonly used as a screening method to verify the identity and quality of dried herbal medicinal plant material. (ateneo.edu)
  • We have developed a rapid method of analysis of five catechins and caffeine in matcha using micellar electrokinetic chromatography. (nih.gov)
  • A capillary electrophoresis method and apparatus for reducing dispersion of sample fractions are disclosed. (google.com)
  • Capillary electrophoresis (CE) is a separation method which is based on different velocities of ions in an electric field. (fz-juelich.de)
  • The method was applied to a sample of milky flour, which it was possible to determine 4 vitamins (B 3 , B 5 , B 6 e C). A method for separating soluble vitamins using liquid chromatography has also been proposed. (usp.br)
  • In order to adopt a general workflow for complex biological matrices with respect to a new blood-brain barrier (BBB) model, a micellar electrokinetic chromatography method has been developed. (wiley.com)
  • Also, a simple capillary zone electrophoresis method was applied to study the stability of the studied penicillin derivatives in water at different temperatures, using ciprofloxacin hydrochloride as internal standard. (scielo.br)
  • Researchers from the University of Granada (UGR) have used their own method of 'microextraction and capillary electrophoresis' to analyse concentrations of a kind of mycotoxins, patulin, in 19 batches of eight brands of commercial apple juice. (medicalxpress.com)
  • A double-injection micellar electrokinetic chromatography (DIMEKC) method for the identification of Ɛ- caprolactam and melamine deliberately added to povidone (polyvinylpyrrolidone) products has been developed. (omicsonline.org)
  • Three phenylpropanoids (ferulic acid, chlorogenic acid, and caffeic acid) are simultaneously separated and determined within 13 min by a new capillary electrophoresis method using 15 mmol/L sodium borate (pH 8.71) as run buffer. (ebscohost.com)
  • In this study, a novel infrared-assisted extraction method coupled capillary electrophoresis (CE) is employed to determine chlorogenic acid from a traditional Chinese medicine (TCM), honeysuckle. (ebscohost.com)
  • 1996. Capillary electrophoresis of Cheddar cheese. (usu.edu)
  • During the experiment, the capillary is filled with the electrolyte solution and the sample to be tested is injected from the anode part of the capillary. (news-medical.net)
  • Based on technology, the human identification analysis software market is segmented into polymerase chain reaction, purification and extraction, next-generation sequencing, microarray, automated liquid handling, capillary electrophoresis and DNA testing. (medgadget.com)
  • A Comparative Study of Capillary Zone Electrophoresis and High-Performance Liquid Cchromatography in the Analysis of Oligonucleotides and DNA. (uni-salzburg.at)
  • High-Resolution Liquid Chromatography of Oligonucleotides on Highly Crosslinked Poly(styrene-divinylbenzene) Particles. (uni-salzburg.at)
  • High-Resolution Liquid Chromatography of DNA Fragments on Non Porous Poly(styrene-divinylbenzene) Particles. (uni-salzburg.at)
  • Routine High Performance Liquid Chromatography of Hepatitis C cDNA/PCR Products. (uni-salzburg.at)
  • In 2001, the second glossary of common and not-so-common terms and 'buzz words' for reference to high performance liquid chromatography (HPLC) columns and column technology was published (1). (chromatographyonline.com)
  • To make room for this expansion, we have decided to remove most of the terms referring to capillary electrophoresis (CE) because this technique is rather specialized and not all liquid chromatographers are also performing the various forms of CE. (chromatographyonline.com)
  • The capillary is directly passed through the detector. (fz-juelich.de)
  • Abstract Capillary electrophoresis was applied to the analysis of a mixture of triazine herbicides of environmental interest. (ndsl.kr)
  • A basic schematic of a capillary electrophoresis system is shown in figure 1. (wikipedia.org)
  • The capillary electrophoresis system G1600A from Agilent is available. (fz-juelich.de)
  • J]. Chinese Journal of Chromatography, 1997, 15(2): 156-158. (chrom-china.com)
  • J]. Chinese Journal of Chromatography, 1997, 15(2): 159-160. (chrom-china.com)
  • corylifoliaby using HPLC MS spectra gas chromatography (GC) and micellar electrokinetic capillary chromatography. (cylch.org)
  • Journal of Chromatography A 585 (1) : 139-144. (nus.edu.sg)
  • author={Rongying Wang and Xiaoning Lu and Wanyun Ma}, journal={Journal of chromatography. (semanticscholar.org)
  • Journal of Chromatography, B: Biomedical Sciences and Applications , 717 (1-2), 119-124. (tue.nl)
  • J]. Chinese Journal of Chromatography, 2007, 25(6): 934-938. (chrom-china.com)
  • Fast analysis of malachite green, leucomalachite green, crystal violet and leucocrystal violet in fish tissue based on a modified QuEChERS procedure [J]. Chinese Journal of Chromatography, 2014, 32(4): 419-425. (chrom-china.com)
  • J]. Chinese Journal of Chromatography, 2007, 25(3): 439-440. (chrom-china.com)
  • J]. Chinese Journal of Chromatography, 2000, 18(5): 456-458. (chrom-china.com)
  • J]. Chinese Journal of Chromatography, 1999, 17(2): 187-189. (chrom-china.com)
  • J]. Chinese Journal of Chromatography, 1999, 17(1): 26-29. (chrom-china.com)
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  • J]. Chinese Journal of Chromatography, 1998, 16(3): 247-249. (chrom-china.com)
  • Journal of Chromatography, 599 (1992) 113-118. (uni-salzburg.at)
  • Journal of Chromatography A, 685 (1994) 213-220. (uni-salzburg.at)
  • Journal of chromatography A 1040:123-31. (abo.fi)
  • Such capillary array electrophoresis (CAE) instruments with 16 or 96 capillaries are used for medium- to high-throughput capillary DNA sequencing, and the inlet ends of the capillaries are arrayed spatially to accept samples directly from SBS-standard footprint 96-well plates. (wikipedia.org)
  • CE was also evaluated for experimental modelling of passive intestinal membrane permeability by studying analyte migration in liposomal, microemulsion and micellar electrolytes. (diva-portal.org)
  • If, on the contrary, sample constituents are widely dispersed in the capillary tube, the constituents are difficult to identify and quantify. (google.com)
  • consequently an efficient separation using the conventional capillary zone electrophoresis is hard to be achieved. (scielo.br)
  • Spatial comprehensive two-dimensional chromatography is discussed as a potentially alternative to the conventional column-based approach. (infona.pl)
  • In Capillary Electrophoresis of Carbohydrates, hands-on experts describe cutting-edge techniques in capillary electrophoresis (CE) for the analysis of complex carbohydrates. (springer.com)
  • Timely and highly practical, Capillary Electrophoresis of Carbohydrates provides both novice and experienced CE analysts with powerful tools for the successful separation of complex carbohydrates by capillary electrophoresis. (springer.com)
  • Physicochemical properties of a mixed micellar system of sodium dodecyl sulfate (SDS) and sodium cholate (SC) were investigated. (edu.au)
  • Capillary Zone Electrophoresis of Aldoses, Ketoses and Uronic Acids Derivatized with Ethyl-p-aminobenzoate. (uni-salzburg.at)
  • Capillary Zone Electrophoresis of p-Aminobenzoic Acid Derivatives of Aldoses, Ketoses and Uronic Acids. (uni-salzburg.at)
  • This is carried out by capillary zone electrophoresis in double-injection mode using polybrene/chondroitin sulfate A double-coated capillaries. (diva-portal.org)
  • Based on the capillary zone electrophoresis theory, we extracted the relevant affecting factors such as temperature, voltage, pH, inlet sample pressure and injection time. (ebscohost.com)
  • Recent developments in high-resolution separation techniques based on capillary-scale chromatography and electrophoresis have transformed the analysis of free and conjugated mono- and oligosaccharides. (springer.com)