A separation technique which combines LIQUID CHROMATOGRAPHY and CAPILLARY ELECTROPHORESIS.
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 phenethylamine that is an isomer of EPHEDRINE which has less central nervous system effects and usage is mainly for respiratory tract decongestion.
Compounds in which a methyl group is attached to the cyano moiety.
The phenomenon whereby compounds whose molecules have the same number and kind of atoms and the same atomic arrangement, but differ in their spatial relationships. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 5th ed)
The motion of a liquid through a membrane (or plug or capillary) consequent upon the application of an electric field across the membrane. (Oxford Dictionary of Biochemistry and Molecular Biology, 2001)
The minute vessels that connect the arterioles and venules.
Transparent, tasteless crystals found in nature as agate, amethyst, chalcedony, cristobalite, flint, sand, QUARTZ, and tridymite. The compound is insoluble in water or acids except hydrofluoric acid.
A non-crystalline form of silicon oxide that has absorptive properties. It is commonly used as a desiccating agent and as a stationary phase for CHROMATOGRAPHY. The fully hydrated form of silica gel has distinct properties and is referred to as SILICIC ACID.
A form of pneumoconiosis resulting from inhalation of dust containing crystalline form of SILICON DIOXIDE, usually in the form of quartz. Amorphous silica is relatively nontoxic.
Relating to the size of solids.
Phenyl esters of carbamic acid or of N-substituted carbamic acids. Structures are similar to PHENYLUREA COMPOUNDS with a carbamate in place of the urea.
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)
A highly miniaturized version of ELECTROPHORESIS performed in a microfluidic device.
Liquid chromatographic techniques which feature high inlet pressures, high sensitivity, and high speed.
An agency in the Executive Branch of the Federal Government. It was created as an independent regulatory agency responsible for the implementation of federal laws designed to protect the environment. Its mission is to protect human health and the ENVIRONMENT.

Study of transaldolase deficiency in urine samples by capillary LC-MS/MS. (1/44)

Transaldolase (TAL) is a key enzyme of the pentose phosphate pathway (PPP). TAL deficiency is a newly recognized cause of liver cirrhosis. We have developed an ion-pair LC separation combined with negative ion electrospray MS/MS detection method to assess PPP metabolites in urine samples from TAL-deficient mice. Sedoheptulose 7-phosphate (S7P), C5-polyols D-arabitol and D-ribitol, and 6-phosphogluconate (6PG) levels were markedly increased in urine of TAL-deficient mice with respect to those of wild-type and heterozygote littermates. The detection limits of S7P, D-arabitol, and 6PG were 0.15 +/- 0.015 pmol, 3.5 +/- 0.41 pmol, and 0.61 +/- 0.055 pmol, respectively. The limit of quantitation was 0.4 +/- 0.024 nmol/ml for S7P, 1.6 +/- 0.11 nmol/ml for 6PG and 10 +/- 0.7 nmol/ml for D-arabitol. Additional metabolites, hexose 6-phosphates (m/z 259), D-ribose 5-phosphate and D-xylulose 5-phosphate (m/z 229), D-fructose 1,6-diphosphate (m/z 339), C6-polyols (m/z 181) and GSSG (m/z 611), that have been positively identified in mouse urine, showed similar levels in control and TAL-deficient mice.  (+info)

Porous polyacrylamide monoliths in hydrophilic interaction capillary electrochromatography of oligosaccharides. (2/44)

Capillary electrochromatography (CEC) of oligosaccharides in porous polyacrylamide monoliths has been explored. While it is possible to alter separation capacity for various compounds by copolymerization of suitable separation ligands in the polymerization backbone, "blank" acrylamide matrix is also capable of sufficient resolution of oligosaccharides in the hydrophilic interaction mode. The "blank" acrylamide network, formed with a more rigid crosslinker, provides maximum efficiency for separations (routinely up to 350,000 theoretical plates/m for fluorescently-labeled oligosaccharides). These columns yield a high spatial resolution of the branched glycan isomers and large column permeabilities. From the structural point of view, some voids are observable in the monoliths at the mesoporous range (mean pore radius ca. 35 nm, surface area of 74 m2/g), as measured by intrusion porosimetry in the dry state.  (+info)

1-methyl-4-phenylpyridinium-induced alterations of glutathione status in immortalized rat dopaminergic neurons. (3/44)

Decreased glutathione levels associated with increased oxidative stress are a hallmark of numerous neurodegenerative diseases, including Parkinson's disease. GSH is an important molecule that serves as an anti-oxidant and is also a major determinant of cellular redox environment. Previous studies have demonstrated that neurotoxins can cause changes in reduced and oxidized GSH levels; however, information regarding steady state levels remains unexplored. The goal of this study was to characterize changes in cellular GSH levels and its regulatory enzymes in a dopaminergic cell line (N27) following treatment with the Parkinsonian toxin, 1-methyl-4-phenylpyridinium (MPP(+)). Cellular GSH levels were initially significantly decreased 12 h after treatment, but subsequently recovered to values greater than controls by 24 h. However, oxidized glutathione (GSSG) levels were increased 24 h following treatment, concomitant with a decrease in GSH/GSSG ratio prior to cell death. In accordance with these changes, ROS levels were also increased, confirming the presence of oxidative stress. Decreased enzymatic activities of glutathione reductase and glutamate-cysteine ligase by 20-25% were observed at early time points and partly account for changes in GSH levels after MPP(+) exposure. Additionally, glutathione peroxidase activity was increased 24 h following treatment. MPP(+) treatment was not associated with increased efflux of glutathione to the medium. These data further elucidate the mechanisms underlying GSH depletion in response to the Parkinsonian toxin, MPP(+).  (+info)

Analysis of [3',3'-d(2)]-nicotine and [3',3'-d(2)]-cotinine by capillary liquid chromatography-electrospray tandem mass spectrometry. (4/44)

A selective and sensitive LC/MS/MS assay was developed for the quantification of d(2)-nicotine and d(2)-cotinine in plasma of current and past smokers administered d(2)-nicotine. After solid phase extraction and liquid-liquid extraction, HPLC separation was achieved on a capillary hydrophilic interaction chromatography phase column. The analytes were monitored by tandem mass spectrometry with electrospray positive ionization. Linear calibration curves were generated for d(2)-nicotine (0.03-6.0 ng/ml plasma) and d(2)-cotinine (0.15-25 ng/ml plasma). The lower limits of quantitation were 0.15 ng/ml and 0.25 ng/ml for d(2)-nicotine and d(2)-cotinine, respectively. The coefficient of variation was 3.7% for d(2)-nicotine and 2.5% for d(2)-cotinine. The method was applied to two ongoing studies of d(2)-nicotine metabolism in prior and current smokers. Preliminary analysis of a subset of subjects from these studies detected a significantly lower rate of nicotine conversion to cotinine by past smokers compared to current smokers.  (+info)

Component and antioxidant properties of polysaccharide fractions isolated from Angelica sinensis (OLIV.) DIELS. (5/44)

An analytical method of high performance capillary electrophoresis (HPCE) was developed to simultaneously separate and identify the component monosaccharides of Angelica sinensis polysaccharide fractions (APFs), named APF1, APF2 and APF3. The predominant sugars in APFs were identified as arabinose, glucose, rhamnose, galactose and galacturonic acid as well as trace amount of mannose and glucuronic acid, and the fractionation altered significantly the distribution of component monosaccharides in APFs. APF3 was the most active fraction to effectively inhibit H(2)O(2)-caused decrease of cell viability, lactate dehydrogenase (LDH) leakage and malondialdehyde (MDA) formation, and also reduced H(2)O(2)-caused decline of superoxide dismutase (SOD) activity and glutathione (GSH) depletion (p<0.05), followed by APF2 and APF1 in decreasing order. Furthermore, it was found that APFs (100 microg/ml) could protect macrophages by inhibiting the release of excess NO and reactive oxygen species (ROS) induced by high concentrations of H(2)O(2) (0.8-1.6 mM).  (+info)

Effect of decreasing column inner diameter and use of off-line two-dimensional chromatography on metabolite detection in complex mixtures. (6/44)

Capillary liquid chromatography coupled with electrospray ionization to a quadrupole ion trap mass spectrometer was explored as a method for the analysis of polar anionic compounds in complex metabolome mixtures. A ternary mobile phase gradient, consisting of aqueous acidic, aqueous neutral and organic phases in combination with an aqueous compatible reversed-phase stationary phase allowed metabolites with a wide range of polarities to be resolved and detected. Detection limits in the full scan mode for glycolysis and tricarboxylic acid cycle intermediates were from 0.9 to 36fmol. Using this system, 111+/-9 (n=3) metabolites were detected in Escherichia coli lysate samples. Reducing column I.D. from 50 to 25microm increased the number of metabolites detected to 156+/-17 (n=3). The improvement in number of metabolites detected was attributed to an increase in separation efficiency, an increase in sensitivity, and a decrease in adduct formation. Implementation of a second separation mode, strong anion exchange, to fractionate the sample prior to capillary RPLC increased the number of metabolites detected to 244+/-21 (n=3). This improvement was attributed to the increased peak capacity which decreased co-elution of molecules enabling more sensitive detection by mass spectrometry. This system was also applied to islets of Langerhans where more significant improvements in metabolite detection were observed. In islets, 391+/-33 small molecules were detected using the two-dimensional separation. The results demonstrate that column miniaturization and use of two-dimensional separations can yield a significant improvement in the coverage of the metabolome.  (+info)

Evaluation of polymeric methacrylate-based monoliths in capillary electrochromatography for their potential to separate pharmaceutical compounds. (7/44)

Polymeric methacrylate-based monoliths are evaluated in capillary electrochromatography (CEC) and pressurized capillary electrochromatography (p-CEC) for their potential in pharmaceutical analysis. Using a given polymerization mixture as a basis for the monolith synthesis, different mobile phase pH at constant organic modifier concentrations are tested in both CEC and p-CEC. The test set consists of basic, acidic, amphoteric, and neutral compounds, which are mainly pharmaceuticals. Because of the mainly hydrophobic character of the stationary phase, the interactions are largest when the compounds appear in an uncharged state, but some ion-exchange phenomena with negatively charged compounds can also be observed. In CEC, acidic substances are most retained at low pH. For amphoteric and neutral compounds, no preference regarding analyzing pH can be derived from these experiments. For basics, a high pH is chosen, but a reduced solvent strength is needed to enhance the retention of these compounds. The retention mechanism in p-CEC can also be assigned to both hydrophobic and ionic interactions. For acidic, amphoteric, and neutral compounds, acceptable retention is seen. For the basic compounds, the retention with a mobile phase containing 50% organic modifier is low, as in CEC. However, when the organic modifier content in the mobile phase is decreased, retention increases and the selectivity of the stationary phase is more pronounced. This mode of operation presents a possibility for separating some test mixtures, thus some potential for pharmaceutical analysis is seen. More efforts are needed to obtain higher efficiencies and better peak shapes, which might be solved by a further optimization of both the stationary phase synthesis and the mobile phase composition.  (+info)

A novel chip device based on wired capillary packed with high performance polymer-based monolith for HPLC: reproducibility in preparation processes to obtain long columns. (8/44)

This report describes the development of novel wired chip devices for mu-HPLC analyses. The monolithic capillary column to be wired was prepared using a tri-functional epoxy monomer, tris(2,3-epoxypropyl)isocyanurate with a diamine, 4-[(4-aminocyclohexyl)methyl]cyclohexylamine. The prepared column was evaluated by SEM observation of the sectional structure of column and micro-HPLC. In addition, the reproducibility in the preparation of long capillary columns having nearly 1 m length was extensively examined for applications of novel wired chip devices. The authors demonstrated that the monolithic structure of the prepared long capillary could be finely controlled under the strictly maintained operational conditions and thus the relative standard deviation (RSD) of the column properties such as the number of theoretical plates, retention factor, and permeability could be well controlled to become less than 10%. Furthermore, the wired chip device column showed that its high performance was kept even after chip preparation.  (+info)

On-Column Ion-Exchange Preconcentration of Inorganic Anions in Open Tubular Capillary Electrochromatography with Elution Using Transient-Isotachophoretic Gradients. 3. Implementation and Method Development
TY - JOUR. T1 - Shielded stationary phases based on porous polymer monoliths for the capillary electrochromatography of highly basic biomolecules. AU - Hilder, Emily F.. AU - Svec, Frantisek. AU - Frechet, Jean. PY - 2004/7/15. Y1 - 2004/7/15. N2 - A novel stationary phase for capillary electrochromatography has been prepared via photoinitiated grafting of two layers of polymer chains onto the pore surface of a porous polymer monolith. To achieve the desired retention, the original monolith with optimized porous properties was grafted with an interior layer consisting of the ionizable monomer, 2-acrylamido-2-methyl-1-propanesulfonic acid, followed by a covering layer of hydrophobic polymer chains. This technique affords monolithic CEC columns that facilitate electroosmotic flow (EOF) while preventing ionized analytes from interacting with the charged surface functionalities. Grafting of the second layer does not adversely affect the EOF. Grafting times of 30 and 60 s for AMPS and butyl ...
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 ...
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 - ...
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 ...
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Capillary columns packed electrokinetically with 1.5-μm nonporous octadecylsilica particles are used to achieve rapid separations with high efficiencies. A mixture containing five polycyclic aromatic hydrocarbons (PAHs) as test compounds is separated in less than 5 s with 28 kV applied to a column with a packed length of 6.5 cm (10 cm total length). A sample containing 16 PAHs (classified as priority pollutants by the U.S. Environmental Protection Agency) is isocratically separated in under 10 min by using longer columns (15-30 cm). Separation efficiencies greater than 700 000 theoretical plates/m are obtained when detection (via UV-excited laser-induced fluorescence) is performed on the packed portion of the capillary. The outlet frit is observed to play an important role in determining column efficiency. The optimum flow rate for best separation efficiency occurs at ∼2 mm/s. The run-to-run reproducibility of the peak retention times on a single column is better than 1% (relative standard deviation)
Citation: N/A Interpretive Summary: Vitamin E and related compounds are important minor constituents of oilseeds. They provide many health benefits and are useful in oil preservation. State-of-the-art techniques are needed for studying the impact of the minor constituents on the quality and stability of vegetable oils. Separations of the vitamin-E active compounds in edible oils were evaluated by capillary electrochromatography. The new high-speed techniqu requires minimum solvent consumption. The technique can be used by seed growers and the food/oil industries for information on factors affecting oil quality/stability. Food scientists can utilize the optimized distribution data for improving food flavor and quality. Technical Abstract: Separations of lipid antioxidants, tocopherols (T), and tocotrienols (T3) on octylsilica (OS), octadecylsilica (ODS), phenylsilica, or silica were studied by capillary electrochromatography (CEC)-UV detection. The homologues and isomers of the vitamin E-active ...
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β-Cyclodextrin (β-CD) was anchored onto silica particles at its C(2) position, derivatized primarily at the C(6) position by treatment with bromoacetyl bromide, and finally reacted with two types of cyclams to form cyclam-capped β-CD-bonded silica particles. When used as chiral stationary phases in capillary electrochromatography, these novel bonded silica particles exhibited excellent enantioselectivities for chiral separations. © 2002 Elsevier Science Ltd. 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 ...
The introduction of therapeutic peptides and proteins can be an expensive and time-intensive process. between January 2012 and Dec 2013 publication within the within the two-year period. The parting principles and technical advancements of CE capillary gel electrophoresis capillary isoelectric concentrating capillary electrochromatography and CE-mass spectrometry are talked about alongside exciting brand-new applications of LY2603618 … Continue reading The introduction of therapeutic peptides and proteins can be an expensive. ...
The Journal of Liquid Chromatography and Related Technologies is an internationally acclaimed forum for fast publication of critical, peer reviewed manuscripts dealing with analytical, preparative and process scale liquid chromatography and all of its related technologies, including TLC, capillary electrophoresis, capillary electrochromatography,...
Microcalcifications can be the early and only presenting sign of breast cancer. One shared characteristic of breast cancer is the appearance of mammographic mammary microcalcifications that can routinely be used to detect breast cancer in its initial stages, which is of key importance due to the possibility that early detection allows the application of more conservative therapies for a better patient outcome. The mechanism by which mammary microcalcifications are formed is still largely unknown but breast cancers presenting microcalcifications are more often associated with a poorer prognosis. We combined Capillary Electrochromatography, histology, and gene expression (qRT-PCR) to analyze patient-matched normal breast tissue vs. breast tumor. Potential carcinogenicity of oxalate was tested by its inoculation into mice. All data were subjected to statistical analysis. To study the biological significance of oxalates within the breast tumor microenvironment, we measured oxalate concentration in both
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Fritless particle-loaded monoliths for chiral capillary electrochromatographic (CEC) separation were prepared. Silica particles containing a chiral selector are suspended in a monomer solution, which is drawn into the capillary followed by in situ polymerization. Thereby the silica-based particles containing the chiral selector are embedded in a nonchiral continuous bed. This kind of chiral stationary phase is inexpensive, easy, and reproducible to prepare and circumvents the preparation of frits. As a model, teicoplanin aglycone as chiral selector bonded to 3 μm silica particles was used. The applicability of this approach is demonstrated by means of the chiral separation of aliphatic and aromatic amino acids and dipeptides. As a further application, the chiral selector ristocetin A bonded to 3 μm silica particles was used for the enantiomeric separation of chiral α-hydroxy acids. Since α-hydroxy acids migrate toward the anode, a cationic charge-providing agent was copolymerized with the ...
The spatially controlled synthesis of poly(glycidyl methacrylate-co-ethylene dimethacrylate) monolithic stationary phases in polyimide coated fused silica capillaries by visible light induced radical polymerisation using a three-component initiator and a 660 nm light emitting diode (LED) as a light source is
This contribution relates to the assessment of gradient-elution parameters in capillary liquid chromatography affecting the peak widths in the reversed-phase separation of peptides and intact proteins. Gradient separations were performed using both a poly(sytrene-co-divinylbenzene) monolithic column and a microparticulate fused-core column (silica C18, 2.7 mu m). The applicability of the conventional linear (LSS) and non-linear solvent-strength model (Neue-Kuss) were investigated to describe the retention behaviour of the compounds as a function of the mobile-phase composition. This was performed by using a wide range of gradient conditions, including different gradient slopes (beta, ranging from 0.05 to 0.65 min(-1)) and mobile-phase compositions (Delta phi, i.e. gradient span). Although the LSS-model provided accurate retention time predictions (,1.3% deviation) of scouting runs with more conventional gradient slopes, the prediction of high-speed separations with a high degree of accuracy ...
A microchip laboratory system and method proved fluid manipulations for a variety of applications, including sample injection for microchip chemical separations. The microchip is fabricated using standard photolithographic procedures and chemical wet etching, with the substrate and cover plate joined using direct bonding. Capillary electrophoresis and electrochromatography are performed in channels formed in the substrate. Analytes are loaded into a four-way intersection of channels by electrokinetically pumping the analyte through the intersection, followed by switching of the potentials to force an analyte plug into the separation channel.
The Journal of Chromatography A publishes papers on all aspects of separation science including chromatography, electrochromatography, electrophoresis, hyphenated and other multi-dimensional techniques, sample preparation as well as detection methods such as mass spectrometry. .
An SDRAM memory chip device comprises a non-volatile memory controller for operating a non-volatile memory, e.g., a NAND-flash, and a FIFO memory buffer. The FIFO memory buffer serves to operate background store and load operations between a FIFO buffer array and the non-volatile memory, while a host system such as a CPU exchanges data with the SDRAM work memory. The SDRAM memory chip device, therefore, has at least two additional pins as compared with conventional SDRAM standard for generating a set of additional commands. These commands are employed by the FIFO memory buffer to manage the data transfer between the FIFO buffer and each of the non-volatile memory and the volatile SDRAM memory. Two further pins reflecting the flash memory status provide appropriate issuance of load or store signals by the host system.
An SDRAM memory chip device comprises a non-volatile memory controller for operating a non-volatile memory, e.g., a NAND-flash, and a FIFO memory buffer. The FIFO memory buffer serves to operate background store and load operations between a FIFO buffer array and the non-volatile memory, while a host system such as a CPU exchanges data with the SDRAM work memory. The SDRAM memory chip device, therefore, has at least two additional pins as compared with conventional SDRAM standard for generating a set of additional commands. These commands are employed by the FIFO memory buffer to manage the data transfer between the FIFO buffer and each of the non-volatile memory and the volatile SDRAM memory. Two further pins reflecting the flash memory status provide appropriate issuance of load or store signals by the host system.
A method of preparing a polymer under predetermined temperature conditions comprises conducting the polymerization within a closed reaction chamber configured such that most or all of an inner surface has heat exchange capability. The chambers dimensions are such that the polymerization mixture contacts the effective heat exchange surface sufficiently to ensure that the temperature throughout the polymerization mixture does not vary more than a few degrees from a desired temperature. In one embodiment the chamber is formed of two adjacent, parallel heat exchange plates, wherein at least one plate has a peripheral lip which, in contact with the opposing plate, forms the closed chamber. Multiple plates can be arrayed to form multiple chambers, and each chambers polymerization temperature, as well as resident polymerization mixture, can be individually predetermined. This method and apparatus are particularly useful for preparing polymers used in drag reducing agents for hydrocarbon transportation
Chromatographic column technology in HPLC is an ever-growing field. One area in column technology that has captivated attention in recent years is the use of monolithic columns. Monolithic stationary phases for use in liquid chromatography possess unique characteristics, the most significant of which is a relatively high flow through porosity leading to low column pressure drops, with the potential for use with elevated flow rates leading to faster separations. Silica-based monolithic columns are the most popular phases currently for small molecule separations, although organic polymer-based monoliths have also been studies extensively. Within this thesis the preparation of carbon monoliths of varying flow through porosity for potential chromatographic and electrochemical applications is described. Carbon based monoliths can provide excellent chemical and thermal stability, surpassing those of silica. Unlike alternative materials, carbon monoliths have the advantage of being resistant to ...
D3437 Practice for Sampling and Handling Liquid Cyclic Products. D4307 Practice for Preparation of Liquid Blends for Use as Analytical Standards. D4790 Terminology of Aromatic Hydrocarbons and Related Chemicals. D6809 Guide for Quality Control and Quality Assurance Procedures for Aromatic Hydrocarbons and Related Materials. E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications. E355 Practice for Gas Chromatography Terms and Relationships. E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method. E1510 Practice for Installing Fused Silica Open Tubular Capillary Columns in Gas Chromatographs. ...
How is open-tubular liquid chromatography abbreviated? o-LC stands for open-tubular liquid chromatography. o-LC is defined as open-tubular liquid chromatography rarely.
Rapid chiral separation and impurity determination of ropivacaine and bupivacaine by Densitometry-HPTLC, using mucopolysaccharide as chiral mobile phase additive
download chiral separations for Effective Intervention, 32, 32-39. Our very system uses in its personal day of address. There includes a assigned policy been into the implementation for options to build school-based issues.
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CIM® DEAE-8 mL tube is a cylindrical-shaped monolithic column with a column volume of 8 mL. It is encased in a specially designed housing and is
I. Mihelic, T. Koloini, A. Podgornik, A. Štrancar J. High Resol, Chromatogr. 2000, 23, (1) 39-43 The characterization of CIM® DEAE monolithic columns
abcr is ideally positioned in the area of chiral compounds. Learn more about the properties, synthesis and application fields of our chiral portfolio.
Labscoop is a global science eCommerce engine. Comparison shop millions of products from hundreds of vendors to ensure competitive pricing and reliability. Chiral Compounds Biochemicals & Reagents
The resistance to the mass transfer term for the stationary phase must be considered in isolation. The experimentally observed plate height (variance per unit length) resulting from a particular dispersion process [e.g., (hs), the resistance to mass transfer in the stationary phase] will be the sum of the local plate height contributions (h); i.e.,. ...
Scientists in New York and North Carolina say they have assembled the first functioning prototype of an artificial Golgi organelle, a key structure inside cells which helps process and package hormones, enzymes, and other substances that allow the body to function normally.
A method for separating plasma from red blood cells and a device utilizing the method in which a low-pressure filter is interposed in a pathway between an inlet port and a reaction area. The sole driving force for the movement of plasma from the filter to the reaction area is capillary force provided by a tubular capillary. The filter is selected from glass microfiber filters of specified characteristics, which can operate in the absence of agglutinins, and filters capable of separating agglutinated red cells from a plasma, which require the use of an agglutinin.
The present invention provides an endoprosthesis assembly having a reduced cross sectional profile for percutaneous deployment and implantation within a body passageway such as a blood vessel. The assembly comprises a radially expandable cylindrical frame having first and second ends, and a first unexpanded outer diameter and a second expanded outer diameter. The assembly further comprises a radially expandable elastomeric sleeve surrounding a length of the frame and having first and second ends and a first unexpanded inner diameter and a second expanded inner diameter. The inner diameter of the expanded sleeve is not greater than the outer diameter of the expanded frame. The second expanded inner diameter of the sleeve is in a range from about 60% to about 380% greater than the first unexpanded inner diameter of the sleeve. The assembly of the preferred embodiment is adapted to be deployed through an introducer smaller than 9 French and the sleeve is capable of expanding to an inner diameter of about
Practical advice, tutorials, and peer-reviewed research on liquid chromatography (HPLC), gas chromatography (GC), mass spectrometry (MS) and related techniques.
Novasep has recently added a state-of-the-art cGMP pilot scale continuous chromatography unit in its Chasse sur Rhône (France) facility. This ensures cost efficient separations of kilograms to ten ...
For 60 years, Regis Technologies, Inc. has partnered with pharmaceutical and biotechnology companies to help expedite drugs to market. ...
A global strategy for the analysis of glycoproteins by capillary electrophoresis and capillary liquid chromatography coupled to mass spectrometry. Application to quality control of biopharmaceuticals and disease diagnosis ...
PubMed comprises more than 30 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites.
Putting it here so I remember to read more about it later, but 90 second automated digestions!??! They average 60% coverage of proteins at small as cytochrome C and as big as HSA (~67kDa ...
SPE Part: 8E-S038-TGB Strata™-X-AW 33 µm Polymeric Weak Anion, 30 mg / well, 96-Well Plates , 2/Pk Phase: Polymeric weak anion exchange Sorbent Type: Polymer-based Format: 96-Well Plate Target Analytes: Acidic compounds (i.e.) strong acids
SPE Part: 8B-S038-JEG Strata™-X-AW 33 µm Polymeric Weak Anion, 1 g / 20 mL, Giga Tubes , 20/Pk Phase: Polymeric weak anion exchange Sorbent Type: Polymer-based Format: Tube Target Analytes: Acidic compounds (i.e.) strong acids
The COSMOSIL 5C18-AR-II packed column features a polymeric type of C18 reversed phase material. The acidic resistance of COSMOSIL 5C18-AR-II is much improved compared with commercially available monomeric type octadecyl stationary phases. It retains high performance even in case of acidic mobile phases commonly used to separate acidic compounds and peptides.. Figure ...
Designed to maximize selectivity differences, the ACQUITY CSH Fluoro-Phenyl column provides maximum method development freedom, especially when using low pH mobile phases. The non-encapped sorbent provides you with enhanced retention of acidic compounds.
Read reviews and compare manufacturers of Supercritical Fluid Chromatography > Columns > Open Tubular Capillaries products in the SelectScience products and suppliers directory
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 ...
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 ...
Overview of Capillary Electrophoresis in Pharmaceutical Analysis -- Theoretical Consideration in Performance of Various Modes of CE -- Equipment Considerations for Capillary Electrophoresis -- Method Development for Pharmaceutical Analysis -- Role of CE in Drug Substance and Drug Product Development -- General Considerations to Improve Performance of CE Methods -- Overview of Current Regulatory Guidance -- Qualification of CE Instrumentation -- Robustness Testing of CE Methods -- Validation of Analytical Methods Using Capillary Electrophoresis-- The Need for CE Methods in Pharmacopeial Monographs -- CE in Impurity Profiling of Drugs -- Ion Analysis Using Capillary Electrophoresis -- Role of CE in Biopharmaceutical Development and Quality Control -- Capillary Electrophoresis and Bioanalysis -- CE as an Orthogonal Technique to Chromatography -- Capillary Electrochromatography of Pharmaceuticals -- Coupling CE and Chip-based Devices and Mass Spectrometry ...
A colloidal crystal is an ordered array of colloid particles, analogous to a standard crystal whose repeating subunits are atoms or molecules. A natural example of this phenomenon can be found in the gem opal, where spheres of silica assume a close-packed locally periodic structure under moderate compression. Bulk properties of a colloidal crystal depend on composition, particle size, packing arrangement, and degree of regularity. Applications include photonics, materials processing, and the study of self-assembly and phase transitions. IUPAC definition Assembly of colloid particles with a periodic structure that conforms to symmetries familiar from molecular or atomic crystals. Note: Colloidal crystals may be formed in a liquid medium or during drying of particle suspension. A colloidal crystal is a highly ordered array of particles which can be formed over a long range (to about a centimeter). Arrays such as this appear to be analogous to their atomic or molecular counterparts with proper ...
Chiral separations of five β-adrenergic antagonists (propranolol, esmolol, atenolol, metoprolol, and bisoprolol) were studied by capillary electrophoresis using six cyclodextrins (CDs) as the chiral selectors. Carboxymethylated-β-cyclodextrin (CM-β-CD) exhibited a higher enantioselectivity power compared to the other tested CDs. The influences of the concentration of CM-β-CD, buffer pH, buffer concentration, temperature, and applied voltage were investigated. The good chiral separation of five β-adrenergic antagonists was achieved using 50 mM Tris buffer at pH 4.0 containing 8 mM CM-β-CD with an applied voltage of 24 kV at 20 °C. In order to understand possible chiral recognition mechanisms of these racemates with CM-β-CD, host-guest binding procedures of CM-β-CD and these racemates were studied using the molecular docking software Autodock. The binding free energy was calculated using the Autodock semi-empirical binding free energy function. The results showed that the phenyl or naphthyl ring
TY - JOUR. T1 - Development of an affinity silica monolith containing α1-acid glycoprotein for chiral separations. AU - Mallik, Rangan. AU - Xuan, Hai. AU - Hage, David S.. PY - 2007/5/18. Y1 - 2007/5/18. N2 - An affinity monolith based on silica and containing immobilized α1-acid glycoprotein (AGP) was developed and evaluated in terms of its binding, efficiency and selectivity in chiral separations. The results were compared with data obtained for the same protein when used as a chiral stationary phase with HPLC-grade silica particles or monoliths based on a copolymer of glycidyl methacrylate (GMA) and ethylene dimethacrylate (EDMA). The surface coverage of AGP in the silica monolith was 18% higher than that obtained with silica particles and 61% higher than that measured for a GMA/EDMA monolith. The higher surface area of the silica monolith gave materials that contained 1.5- to 3.6-times more immobilized protein per unit volume when compared to silica particles or a GMA/EDMA monolith. The ...
TY - JOUR. T1 - Development of an affinity silica monolith containing α1-acid glycoprotein for chiral separations. AU - Mallik, Rangan. AU - Xuan, Hai. AU - Hage, David S.. PY - 2007/5/18. Y1 - 2007/5/18. N2 - An affinity monolith based on silica and containing immobilized α1-acid glycoprotein (AGP) was developed and evaluated in terms of its binding, efficiency and selectivity in chiral separations. The results were compared with data obtained for the same protein when used as a chiral stationary phase with HPLC-grade silica particles or monoliths based on a copolymer of glycidyl methacrylate (GMA) and ethylene dimethacrylate (EDMA). The surface coverage of AGP in the silica monolith was 18% higher than that obtained with silica particles and 61% higher than that measured for a GMA/EDMA monolith. The higher surface area of the silica monolith gave materials that contained 1.5- to 3.6-times more immobilized protein per unit volume when compared to silica particles or a GMA/EDMA monolith. The ...
Abstract: Many pharmaceuticals contain active ingredients that have more than one stereoisomer. An important concern is the recognition that these different stereoisomers do not necessarily have identical, or even desirable biological activity. Consequently, analytical methods for the analysis and separation of enantiomers are important in the proper development of a marketed pharmaceutical product. In this research, direct HPLC methods for the chromatographic separation of oxyphene optical isomers have been developed and optimized using three types of chiral stationary phases. The research carried out a systematic study of the conditions for the separation of oxyphene optical isomers using synthetic polymer chiral stationary phase of cellulose tris (3, 5-dimethylphenylcarbamate) Chiralcel OD, ß-cyclodextrin chiral stationary phase, and a1-acid glycoprotein chiral stationary phase. The methods using the ß-cyclodextrin and Chiralcel OD columns provide for the accurate determination of the ...
Rapid determination of theaflavins by HPLC with a new monolithic column | Jianyong Zhang, Hongchun Cui, Heyuan Jiang, Lei Fang, Weiwei Wang, Wei Su, Chunhua Xiong | Agricultural Journals
A simple capillary flow porometer (CFP) was assembled for pore structure characterization of monolithic capillary liquid chromatography columns based on ASTM standard F316-86. Determination of differential pressures and flow rates through dry and wet samples provided the necessary information to determine the through-pore throat diameter, bubble point pore diameter, mean flow pore diameter, and pore distribution. Unlike measurements in bulk using traditional techniques to provide indirect information about the pore properties of monolithic columns, monoliths can be characterized in their original chromatographic forms with this system. The performance of the new CFP was first evaluated by characterizing the pore size distributions of capillary columns packed with 3, 5, and 7 µm spherical silica particles. The mean through-pore diameters of the three packed columns were measured to be 0.5, 1.0 and 1.4 µm, which are all smaller than the pore diameters calculated from a close-packed arrangement (i.e., 0
Papaverine hydrochloride Spasm of smooth muscles: abdominal organs (cholecystitis, pilorospazm, spastic colitis, renal colic), peripheral vascular (occlusive disease), cerebrovascular, cardiac - angina (in the complex therapy), bronchospasm; as an auxiliary drug for sedation.
The effects of some factors important in ion-pair, high-performance liquid chromatography were studied in ion-pair, thin-layer chromatography. Tetramethyl and cetyltrimethylammonium salts were used...
The degree of acidity or alkalinity is an important property of our blood. The acidity level increases with the increase in the level of acidic compounds in our body, or when the level of basic (also known as alkaline) compounds present in our body falls. The alkalinity level in our body increases when the reverse takes place, i.e., when the level of acidic compounds falls or when the basic compounds in the body increase. The acidity or alkalinity of any solution is indicated on the pH scale. Even a minor shift from the normal range can destroy our organs. Generally, the normal acidic level (pH) of our blood is close to 7.4. When the pH level falls below 7.35, then we say that acidosis has occurred. On the other hand, when the pH goes above 7.45, then we say that alkalosis has occurred. We have a severe case of the former, when the pH value of blood goes below 7.0; while a severe case of the latter can occur when the pH value goes above 7.5. Let us now see what are the various causes and ...
Graphite Capillary Column Ferrule, Nut Size: 1/16in, Column Inner Diameter: 0.32mm, Ferrule Inner Diameter: 0.5mm (2-Hole), Pkg 10
In this work, a new oligomer matrix-assisted dispersion (OMAD) method for the preparation of homogeneous dispersion of multi-walled carbon nanotubes (MWNTs) incorporated monolithic column was developed. Oligomers matrix as a scaffold could allow MWNTs to entangle with it instead of self-aggregation, so the MWNTs remain in the polymer network followed by in situ self-solidification. The OMAD method not only greatly enlarged the BET surface area of MWNTs incorporated monolithic column from 13.8 m(2) g(-1) to 85.5 m(2) g(-1) without a significant effect on the surface chemistry of the MWNTs, but also improved the dispersion of MWNTs making its content up to 5 wt% (with respect to monomers). The synthesized materials combine the favorable attributes of both high permeability and large surface area, making them excellent candidates for on-line separation and enrichment of proteins. The oligomer matrix-assisted dispersion MWNTs incorporated monolithic columns (OMAD-MMC) exhibited higher enrichment ...
Modern Golden Leopard Scalloped Edge Dinnerware Set - 16 Pieces, Fine Bone China. Condition is Brand New. Awesome scalloped edge modern dinner set for four in the exclusive Golden Leopard design from Enchantée Fine Goods. The perfect luxury investment at a good price point. Includes four dinner plates, four entrée plates, four dessert bowls (also perfect for soups and cereals) and four mugs. Made from the highest grade fine bone china, this set is both durable and beautiful. Includes innovative gold ink gilding (with 10% real gold) that allows the set to also be safe to use in the oven, microwave, dishwasher and freezer. Dinner Plate - Height is 2.5cm and diameter is 28.7cm. Entrée Plate - Height is 2.4cm and diameter is 23.8cm. Dessert Bowl - Height is 8.4cm and greatest diameter is 14.3cm. Mug - Height is 11cm and greatest diameter is 11.5cm. These modern dinnerware sets are made from the highest grade fine bone china with over 40% bone ash where over 30% is the standard for high grade!!! ...
A team from the physics department of the Johannes Gutenberg University, Mainz, has investigated nucleation processes and interfacial properties of colloidal crystals. Nucleation is omnipresent in our daily life and describes events as diverse as the formation of rain in clouds, the crystallization of proteins or the growth of nano-particles. The studies undertaken using supercomputers Hazel Hen and Hornet of HLRS Stuttgart contribute towards a more fundamental understanding of these processes and the underlying theoretical foundation.
Researchers have developed and tested a prototype able to provide image data at 60 frames per second, and plan next to conduct animal studies that could lead to commercialization of the device.. Our device will allow doctors to see the whole volume that is in front of them within a blood vessel, said F. Levent Degertekin, a professor in the George W. Woodruff School of Mechanical Engineering at the Georgia Institute of Technology. This will give cardiologists the equivalent of a flashlight so they can see blockages ahead of them in occluded arteries. It has the potential for reducing the amount of surgery that must be done to clear these vessels.. Details of the research were published online in the February 2014 issue of the journal IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control. Research leading to the device development was supported by the National Institute of Biomedical Imaging and Bioengineering (NIBIB), part of the National Institutes of Health.. If youre a ...
CHIRAL SEPARATION. In the area of chiral separations, Expert has developed many separations to detect the trace undesirable enantiomer. Expert is an instructor for the American Chemical Society short course Practical Capillary Electrophoresis and the author of the text with the same title. In addition, Expert has written a book on troubleshooting electrophoretic methods, has numerous publications in he field, and writes a monthly column that appears in American Laboratory ...
Principal Investigator:OKAMOTO Yoshio, Project Period (FY):1998 - 2000, Research Category:Grant-in-Aid for Scientific Research on Priority Areas (B)
Meropenem is a widely used antimicrobial for the treatment of infections associated with the use of invasive medical devices in intensive care unit patients. These treatments are not always effective, in fact, in-vitro studies have demonstrated the difficulty of antimicrobials to penetrate into the biofilm, however in-vivo studies of the effect of these compounds is a trend, mostly because of the complexity of pulmonary samples extracted from ETTs. Therefore, the objective of this study was to evaluate in-tube solid phase microextraction (in-tube SPME) coupled to capillary liquid chromatography (CapLC) with DAD to determine meropenem in ETTs in order to estimate the penetration capability into the biofilm ...
This project is funded by the National Science Foundation, grant # 0822241, 1449550, 1650648, 1743807, and 1813076. Any opinions, findings, and conclusions or recommendations expressed in these materials are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.. ...
Preparative Supercritical Fluid Chromatography (pSFC). As an environment-friendly approach to purification applications, pSFC is being used routinely for an increasing number of applications.. During the recent years SFC has gained acceptance in drug discovery for high-throughput purification of enantiomers. Hence, pSFC replaces preparative HPLC (pHPLC) as major technology for chiral separations in many pharmaceutical companies. Preparative SFC excels not only at separating and purifying chiral compounds but is also powerful for achiral separations and can be implemented in most steps of drug discovery. It may offer potential advantages over pHPLC for purity upgrading of active pharmaceutical ingredients or drug intermediates, impurity isolation and non-aqueous purification.. The use of pSFC as an alternative option to pHPLC receives also a growing interest for natural products, environmental (pesticides) and petroleum (biofuels) applications. ...
Preparative Supercritical Fluid Chromatography (pSFC). As an environment-friendly approach to purification applications, pSFC is being used routinely for an increasing number of applications.. During the recent years SFC has gained acceptance in drug discovery for high-throughput purification of enantiomers. Hence, pSFC replaces preparative HPLC (pHPLC) as major technology for chiral separations in many pharmaceutical companies. Preparative SFC excels not only at separating and purifying chiral compounds but is also powerful for achiral separations and can be implemented in most steps of drug discovery. It may offer potential advantages over pHPLC for purity upgrading of active pharmaceutical ingredients or drug intermediates, impurity isolation and non-aqueous purification.. The use of pSFC as an alternative option to pHPLC receives also a growing interest for natural products, environmental (pesticides) and petroleum (biofuels) applications. ...
D-glucopyranoside, also known as hexose or D-galactose, is a member of the class of compounds known as hexoses. Hexoses are monosaccharides in which the sugar unit is a is a six-carbon containing moeity. D-glucopyranoside is soluble (in water) and a very weakly acidic compound (based on its pKa). D-glucopyranoside can be found in a number of food items such as marzipan, olive, channel catfish, and rubus (blackberry, raspberry), which makes D-glucopyranoside a potential biomarker for the consumption of these food products. D-glucopyranoside exists in all living organisms, ranging from bacteria to humans. The name was originally given to plant products of this nature, in which the other part of the molecule was, in the greater number of cases, an aromatic aldehydic or phenolic compound (exceptions are sinigrin and jalapin or scammonin). It has now been extended to include synthetic ethers, such as those obtained by acting on alcoholic glucose solutions with hydrochloric acid, and also the ...
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( The below information some comes from the Internet and professional websites.) *** What do different LED mean? Like 5050, 3528, 2835, 5730 .... The abbreviation SMD refers to a Surface Mounted Device.That means this is an LED Chip (device) mounted directly to a light strip, without using wires.The Numbers mean th
The Chiral Chromatography Learning Center provides technical resources to help you choose a chiral HPLC or GC column, troubleshoot a chiral method, or enhance your understanding of chiral separations.
These kits provide the necessary columns to perform most chiral separations and run mechanistic studies, and are offered at very attractive prices.Supelco DEX Kit I is valuable for studying the effect of CD size on a separation. All three columns in the kit, α-DEX 120, β-DEX 120, and γ-DEX 120, have the same permethylated derivative, but on different size CDs. One application is to confirm enantiomer identification by monitoring elution order changes (enantioreversal) from one column to another. Supelco DEX Kit II contains four columns, each 30 m x 0.25 mm I.D., 0.25 μm, one each of β-DEX 120, β-DEX 225, γ-DEX 225, and β-DEX 325. Combining this kit with Supelco DEX Kit I spans the full range of Supelco DEX column enantioselectivity.
Previously determined retention data for a series of benzodiazepine (BDZ) derivatives, comprising nine achiral compounds, four single enantiomers, and 18 individual isomers of nine racemates, on a chiral stationary phase based on immobilized human serum albumin (HSA) were analyzed to define quantitative relationships between structure and enantiospecific retention. Structural parametrization of the agents was done by means of hydrophobic fragmental constants and electronic and steric parameters obtained by computational chemistry methods. A structural descriptor was identified, a submolecular measure of polarity about the stereogenic center, that accounted for the stronger electrostatic interactions of the second-eluting enantiomer with the HSA chiral stationary phase. Quantitative structure-enantiospecific retention relationships were derived for both enantiomeric series and for achiral compounds, and structural requirements for binding to HSA were determined. Two types of binding sites were ...
Monoliths, the latest track from Deerhunter guitarist Lockett Pundts solo project Lotus Plaza, is a lush, summery anthem. With layers of radiant guitars and a high-flying chorus, it conjures the wide-open spaces of a road trip through the plains states, or rope-swinging into an icy lake on a hot afternoon. Lotus Plazas second full-length, Spooky Action At A Distance, is out tomorrow on Kranky.. Stream: Lotus Plaza, Monoliths ...
Electrons in chiral crystals, solid-state materials with definite handedness, can behave in unexpected ways. An interdisciplinary team from research institutions in Germany and China has realized now a theoretically predicted peculiar electronic state in a chiral compound, PtGa, from the class of topological materials. The study which was published in the journal Nature Communications allows a fundamental understanding of the electronic properties of this novel semimetal.
UCP209-28 Black Oxide Plated Insert + Pillow Block Bearing Set Screw Type High-Center Height 1 3/4 inch Inner Diameter UCP209-28 Black Oxide Plated Insert Pillow Block Bearing, UCP209-28 is Set Screw Type High-Center Height, Inner Diameter is 1 3/4. Black oxide has certain properties and characteristics that makes
Flame Sampling Probe Assembly for PerkinElmer AS-90/90A/90 Plus/91/93 Plus/S10 Autosampler from PerkinElmer. A Sampling Probe Assembly Component.
The invention relates to particles with opalescent effect-especially 3-D structural color pigments-based on solid colloidal crystals of monodispersed spheres and the manufacturing processes suitable f
Intempco Digital RTD thermometer LCD LED temperature gauge display indicator transmitter sensor probe sanitary PT100 PT1000 Nema4X enclosure battery powered 4-20mA output replace Bi-Metal Dial capillary liquid bulb glass mercury M12
Morton Grove, IL (PRWEB) June 01, 2015 -- Regis Technologies, Inc. is a recognized leader in developing and manufacturing of chiral stationary phases (CSPs)
Steven Ihde and Karan Parikh discuss about tools and frameworks built in order to help LinkedIns transition to microservices, including their URN resolution engine and the Rest.li API Hub.
Another day, another monolith Ruby gem to reach deep into the bowels of your app config, models, views, controllers and make you manage uploadin...
A model Ive been tweaking for quite some time now. My goal was to make a dynamic yet monolith sculpt that looks interesting both up close and from distance. Whether I succeeded - thatd be for the viewer to judge;)
"Optimized separation of pharmacologically active anthraquinones in Rhubarb by capillary electrochromatography". Electrophoresis ...
"Optimized separation of beta-blockers with multiple chiral centers using capillary electrochromatography-mass spectrometry". J ...
"Analysis of oxygen heterocyclic compounds in citrus essential oils by capillary electrochromatography and comparison with HPLC ...
... high temperature chromatography and capillary electrochromatography. Western blotting can be used in order to quantify the ... Some newer methods for the separation and identification of proteins include the use of monolithic capillary columns, ...
Capillary electrochromatography (CEC) is an electrochromatography technique in which the liquid mobile phase is driven through ... Cikalo, Maria G.; Bartle, Keith D.; Robson, Mark M.; Myers, Peter; Euerby, Melvin R. (1998). "Capillary electrochromatography ... Dittmann, Monika M.; Rozing, Gerard P. (1996). "Capillary electrochromatography - a high-efficiency micro-separation technique ... It is a combination of high-performance liquid chromatography and capillary electrophoresis. The capillaries is packed with ...
It may be a liquid (LC and Capillary Electrochromatography (CEC)), a gas (GC), or a supercritical fluid (supercritical-fluid ... Further, capillary columns can be split into three classes: porous layer open tubular (PLOT), wall-coated open tubular (WCOT) ... Capillary columns generally give far superior resolution and although more expensive are becoming widely used, especially for ... Stainless steel and glass are the usual materials for packed columns and quartz or fused silica for capillary columns. ...
In capillary electrochromatography capillaries, packed with HPLC stationary phase, are subjected to a high voltage. Separation ... Capillary electrochromatography (CEC) combines the principles used in HPLC and CE. The mobile phase is driven across the ... Capillary electrochromatography (CEC) is a chromatographic technique in which the mobile phase is driven through the ... Capillary electrochromatography is a combination of two analytical techniques, high-performance liquid chromatography and ...
Electrochromatography. Gas chromatography. High-performance liquid chromatography. Capillary electrochromatography. Ion ...
Capillary electrochromatography. *Capillary electrophoresis. *Dielectrophoresis. *Difference gel electrophoresis. * ...
Electrochromatography. *Gas chromatography. *High-performance liquid chromatography. *Capillary electrochromatography. *Ion ... "Capillary Ion Chromatography at High Pressure and Temperature". Analytical Chemistry. 84 (16): 7212-7217. doi:10.1021/ac301598j ...
Electrochromatography. *Gas chromatography. *High-performance liquid chromatography. *Capillary electrochromatography. *Ion ... "Affinity capillary electrophoresis for the assessment of binding affinity of carbohydrate-based cholera toxin inhibitors". ...
Capillary electrochromatography. *Capillary electrophoresis. *Dielectrophoresis. *Difference gel electrophoresis. * ... Capillary electrophoresis[edit]. In capillary electrophoresis, there is no solid matrix. Proteins are separated primarily by ... The sample is injected into a capillary with a negative surface charge. A high current is applied, and negatively charged ... Depending on whether an agarose or capillary method is used, interferences vary. Immunoglobulins consist of heavy chains (IgA, ...
Electrochromatography. *Gas chromatography. *High-performance liquid chromatography. *Capillary electrochromatography. *Ion ... The gas chromatograph utilizes a capillary column which depends on the column's dimensions (length, diameter, film thickness) ...
Electrochromatography. *Gas chromatography. *High-performance liquid chromatography. *Capillary electrochromatography. *Ion ...
By taking advantage of the capillary effects of the small carbon nanotubes, it is possible to condense gases in high density ... based on electrochromatography. Here, the high surface-area-to-volume ratio and high hydrophobicity of CNTs are used in order ... "Carbon nanotube based separation columns for high electrical field strengths in microchip electrochromatography". Lab on a Chip ...
In capillary electrochromatography capillaries, packed with HPLC stationary phase, are subjected to a high voltage. Separation ... Capillary electrochromatography (CEC) combines the principles used in HPLC and CE. The mobile phase is driven across the ... Capillary electrochromatography (CEC) is a chromatographic technique in which the mobile phase is driven through the ... Capillary electrochromatography is a combination of two analytical techniques, high-performance liquid chromatography and ...
Enantioseparation in capillary chromatography and capillary electrochromatography using polysaccharide-type chiral stationary ...
Hydrophilic interaction chromatography Capillary electrochromatography Neurotransmitters Zwitterionic monolithic column ... Preparation of Novel Zwitterionic Monolith for Capillary Electrochromatography and Nano LC-MS Applications. ... nucleosides and nucleotides for capillary electrochromatography (CEC). Relative standard deviations (RSD%) of the retention ...
A pressurized capillary electrochromatography (pCEC) with monolithic column has been developed for the rapid separation and ... separation and determination of structurally related anthraquinones in Rhubarb by pressurized capillary electrochromatography. ...
... Spégel, Peter LU ; Viberg, ... continuous full filling, electrospray ionisation, orthogonal, capillary electrochromatography, mass spectrometry, ... Reversed phase continuous full filling capillary electrochromatography with electrospray ionisation mass spectrometric ... Reversed phase continuous full filling capillary electrochromatography with electrospray ionisation mass spectrometric ...
Open-tubular capillary electrochromatography of bovine beta-lactoglobulin variants A and B using an aptamer stationary phase. ... Silinski, M., & McGown, L. (2001). Open-tubular capillary electrochromatography of bovine beta-lactoglobulin variants A and B ...
Practical advice, tutorials, and peer-reviewed research on liquid chromatography (HPLC), gas chromatography (GC), mass spectrometry (MS) and related techniques.
Guček, Marjan, Pihlar, Boris (2000). Separation of sugar anomers by capillary electrochromatography. Acta chimica slovenica, ... Separation of sugar anomers by capillary electrochromatography. Acta chimica slovenica letnik 47. številka 2 (2000) str. 165- ...
... capillary electrochromatography (CEC) has been realized. The structure includes an injector and a tapered column in which the ... and tested using a capillary electrophoretic separation of FITC-labeled amino acids. To perform CEC, the separation channel was ... Home , An Integrated Fritless Colum for On-Chip Capillary Electrochromatography with Conventional Stationary Phases , HTML MARC ... capillary electrochromatography (CEC) has been realized. The structure includes an injector and a tapered column in which the ...
Breadmore, MC, Macka, M, Haddad, PR and Avdalovic, N 2000 , Open-tubular ion-exchange capillary electrochromatography of ... The coated capillary showed reversed electro-osmotic flow (EOF), allowing anions to be separated in the co-EOF mode. The latex ... Open-tubular IE-CEC columns were prepared by coating the inner wall of a fused silica capillary with quaternary ammonium anion- ... The effective ion-exchange capacity of the capillary, and also the resulting anion-exchange interactions with the analytes, ...
... capillary electrochromatography (CEC) and pressurized capillary electrochromatography (pCEC) could be applied. The detection ... capillary electrochromatography and pressurized capillary electrochromatography with nuclear magnetic resonance spectroscopy. ... capillary electrochromatography and pressurized capillary electrochromatography with nuclear magnetic resonance spectroscopy ... With the employed apparatus configuration different capillary separation techniques such as capillary high-performance liquid ...
Monolithic stationary phases for fast ion chromatography and capillary electrochromatography of inorganic ions ... and capillary electrochromatography (CEC), concentrating in particular on the properties of organic (polymer) monolithic ... Monolithic stationary phases for fast ion chromatography and capillary electrochromatography of inorganic ions , Journal of ... Electrochromatography • Ion chromatography • Inorganic ions • Monoliths. Journal or Publication Title:. Journal of Separation ...
Reversed-Phase Continuous Beds for Isocratic and Gradient Capillary Liquid Chromatography and Capillary Electrochromatography ...
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... procedure for the preparation of columns applicable in capillary electrochromatography and capillary electrochromatography- ... procedure for the preparation of columns applicable in capillary electrochromatography and capillary electrochromatography- ... Procedure for the Preparation of Columns Applicable in Capillary Electrochromatography and Capillary Electrochromatography- ... procedure for the preparation of columns applicable in capillary electrochromatography and capillary electrochromatography- ...
Capillary electrochromatography (CEC) is an analytical separation technique, coupling the electroosmotic flow principles of ... The suitability of polymerised microemulsions as stationary phases for capillary electrochromatography. Doctoral thesis, Durham ... The development of this technique has been slowed due to technical problems with packing capillary columns. Alteration of the ... capillary electrophoresis (CE) with the stationary phase separation principles of high performance liquid chromatography (HPLC ...
Capillary electrochromatography (CEC) is a separation technique that theoretically combines the advantages of both liquid ... Chapter Recent Applications in Capillary Electrochromatography. Capillary electrochromatography (CEC) is a separation technique ... Chiral Separations by Capillary Electrophoresis. DOI link for Chiral Separations by Capillary Electrophoresis ... Chiral Separations by Capillary Electrophoresis. DOI link for Chiral Separations by Capillary Electrophoresis ...
Capillary electrochromatography. Chiral stationary phase. Crown ether. Cyclam. Enantiomeric separation. Issue Date: 25-Mar-2002 ... When used as chiral stationary phases in capillary electrochromatography, these novel bonded silica particles exhibited ... of cyclam-capped β-cyclodextrin-bonded silica particles for use as chiral stationary phases in capillary electrochromatography ... of cyclam-capped β-cyclodextrin-bonded silica particles for use as chiral stationary phases in capillary electrochromatography ...
Recent advances in enhancing the sensitivity of electrophoresis and electrochromatography in capillaries and microchips (2006- ... Recent advances in enhancing the sensitivity of electrophoresis and electrochromatography in capillaries and microchips (2006- ... Recent advances in enhancing the sensitivity of electrophoresis and electrochromatography in capillaries and microchips (2006- ...
Capillary electrochromatography (CEC) is an electrochromatography technique in which the liquid mobile phase is driven through ... Cikalo, Maria G.; Bartle, Keith D.; Robson, Mark M.; Myers, Peter; Euerby, Melvin R. (1998). "Capillary electrochromatography ... Dittmann, Monika M.; Rozing, Gerard P. (1996). "Capillary electrochromatography - a high-efficiency micro-separation technique ... It is a combination of high-performance liquid chromatography and capillary electrophoresis. The capillaries is packed with ...
"Capillary Electrochromatography" by people in this website by year, and whether "Capillary Electrochromatography" was a major ... "Capillary Electrochromatography" is a descriptor in the National Library of Medicines controlled vocabulary thesaurus, MeSH ( ... Below are the most recent publications written about "Capillary Electrochromatography" by people in Profiles. ... Below are MeSH descriptors whose meaning is more general than "Capillary Electrochromatography". ...
Electro-osmotic and pressure-driven flow properties of frits for packed column capillary electrochromatography prepared from ...
Capillary Electrochromatography Capillary Electrochromatography Editor(s): Keith D Bartle, Peter Myers Print ISBN: 978-0-85404- ... Capillary Electrochromatography Capillary Electrochromatography Capillary Electrochromatography 29 Mar 2001 Available in print ...
Microchip capillary electrochromatography with pillar columns. / Sukas, Sertan .. Enschede : University of Twente, 2013. 127 p. ... Sukas, Sertan . / Microchip capillary electrochromatography with pillar columns. Enschede : University of Twente, 2013. 127 p. ... Sukas S. Microchip capillary electrochromatography with pillar columns. Enschede: University of Twente, 2013. 127 p. https:// ... Sukas, S. (2013). Microchip capillary electrochromatography with pillar columns. Enschede: University of Twente. https://doi. ...
Jiskra, J. ; Claessens, H.A. ; Cramers, C.A.M.G. / Thermodynamic behaviour in capillary electrochromatography. In: Journal of ... Thermodynamic behaviour in capillary electrochromatography. / Jiskra, J.; Claessens, H.A.; Cramers, C.A.M.G. ... Jiskra, J., Claessens, H. A., & Cramers, C. A. M. G. (2002). Thermodynamic behaviour in capillary electrochromatography. ... Fingerprint Dive into the research topics of Thermodynamic behaviour in capillary electrochromatography. Together they form a ...
Monolithic columns, PolyHIPE monoliths, Open-cell structure, Capillary electrochromatography, Fused-Silica Capillaries, ... Acrylic-based high internal phase emulsion polymeric monolith for capillary electrochromatography. Date. ... "Acrylic-based high internal phase emulsion polymeric monolith for capillary electrochromatography," JOURNAL OF CHROMATOGRAPHY A ...
Chiral electrochromatography with a moulded rigid monolithic capillary column. Eric C. Peters*, Kevin Lewandowski, Miroslav ... Chiral electrochromatography with a moulded rigid monolithic capillary column. / Peters, Eric C.; Lewandowski, Kevin; Petro, ... Chiral electrochromatography with a moulded rigid monolithic capillary column. Analytical Communications. 1998;35(3):83-86. ... title = "Chiral electrochromatography with a moulded rigid monolithic capillary column",. abstract = "Several monolithic ...
... is performed on the packed portion of the capillary. The outlet frit is observed to play an important role in determining ... Capillary columns packed electrokinetically with 1.5-μm nonporous octadecylsilica particles are used to achieve rapid ... Advances in Capillary Electrochromatography: Rapid and High-Efficiency Separations of PAHs. *. Rajeev Dadoo. , Richard N. Zare ... inproceedings{Dadoo1998AdvancesIC, title={Advances in Capillary Electrochromatography: Rapid and High-Efficiency Separations of ...
Capillary Electrochromatography (Journal of Chromatography by F. Svec,Z. Deyl PDF. This two-part multivolume set presents a ... Capillary Electrochromatography (Journal of Chromatography Library) by F. Svec,Z. Deyl. by Paul. 4.5 ...
... next generation Micro-Capillary Electrochromatography - a high performance and low power consumption microfluidic sample ... Novel Micro-Capillary Electrochromatography for Mars Organic Detector, Phase II - Los Gatos Research proposes to develop a ...
  • Capillary electrochromatography is a combination of two analytical techniques, high-performance liquid chromatography and capillary electrophoresis. (wikipedia.org)
  • Enantioseparation in capillary chromatography and capillary electrochromatography using polysaccharide-type chiral stationa. (nih.gov)
  • With the employed apparatus configuration different capillary separation techniques such as capillary high-performance liquid chromatography (cHPLC), capillary electrochromatography (CEC) and pressurized capillary electrochromatography (pCEC) could be applied. (ebscohost.com)
  • With this improved interface for capillary liquid chromatography-NMR on-line coupling, the stereochemical assignment of the cis and trans configuration of unsaturated fatty acids could be easily accomplished. (ebscohost.com)
  • The focus of this review is on current developments in monolithic stationary phases for the fast analysis of inorganic ions and other small molecules in ion chromatography (IC) and capillary electrochromatography (CEC), concentrating in particular on the properties of organic (polymer) monolithic materials in comparison to inorganic (silica-based) monoliths. (edu.au)
  • Capillary electrochromatography (CEC) is an analytical separation technique, coupling the electroosmotic flow principles of capillary electrophoresis (CE) with the stationary phase separation principles of high performance liquid chromatography (HPLC). (dur.ac.uk)
  • Capillary electrochromatography (CEC) is a separation technique that theoretically combines the advantages of both liquid chromatography (LC) and capillary electrophoresis (CE). (taylorfrancis.com)
  • It is a combination of high-performance liquid chromatography and capillary electrophoresis. (wikipedia.org)
  • The need for novel packing materials in both capillary electrochromatography (CEC) and capillary liquid chromatography (CLC) is apparent and the development towards more selective, application-oriented chromatographic phases is under progress world-wide. (abo.fi)
  • Axial-beam absorbance detection for capillary electrophoresis," Journal of Chromatography, 550(1991) pp. 831-837. (freepatentsonline.com)
  • An easily-assembled, heat resistant connector for releasably joining end portions of three capillary tubes for use in chromatography without interrupting flow or interfering with chromatographic results comprises a main body, and a glass insert which has first, second and third hollow legs that are connected together at a central portion, and a connector that connects each leg of the glass insert to a capillary tube. (google.com)
  • Retention-time prediction for polycyclic aromatic compounds in reversed-phase capillary electro-chromatography. (semanticscholar.org)
  • 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)
  • Subsequently, a 65-cm-long PLOT-MLC was evaluated as a separator column using a capillary liquid chromatography (Cap-LC) system equipped with a nano-injector and coupled to the mass spectrometer. (springer.com)
  • Causon TJ, Shellie RA, Hilder EF, Desmet G, Eeltink S (2011) Kinetic optimisation of open-tubular liquid-chromatography capillaries coated with thick porous layers for increased loadability. (springer.com)
  • Kazarian AA, Sanz Rodriguez E, Deverell JA, McCord J, Muddiman DC, Paull B (2016) Wall modified photonic crystal fibre capillaries as porous layer open tubular columns for in-capillary micro-extraction and capillary chromatography. (springer.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 viability of open-tubular ion-exchange electrochromatography (IE-CEC) for the separation of inorganic anions was investigated. (edu.au)
  • Open-tubular IE-CEC columns were prepared by coating the inner wall of a fused silica capillary with quaternary ammonium anion-exchange latex particles (approximately 75 nm in diameter) bound electrostatically to the wall. (edu.au)
  • In this study, platelet established as the target molecule open tubular capillary electrochromatography, on Salvia and thirty-seven-of anti / thrombopoietin active ingredient to filter. (dissertationtopic.net)
  • The content of this study are as follows: ① create a new open tubular capillary electrochromatography using physical adsorption platelet fixed to the inner wall of the capillary tube, by changing the fixed length of the migration behavior of the sample in which changes in the mobility and migration degree of platelet Finish length between the linear equation, the binding constant of the target component with platelet interaction. (dissertationtopic.net)
  • On-Column Ion-Exchange Preconcentration of Inorganic Anions in Open Tubular Capillary Electrochromatography with Elution Using Transient-Isotachophoretic Gradients. (edu.au)
  • Breadmore, MC and Palmer, AS and Curran, MAJ and Macka, M and Avdalovic, N and Haddad, PR, On-Column Ion-Exchange Preconcentration of Inorganic Anions in Open Tubular Capillary Electrochromatography with Elution Using Transient-Isotachophoretic Gradients. (edu.au)
  • preparation and evaluation of open-tubular capillary electrochromatography column with the poly (amidoamine) (pamam) dendrimers as bonded stationary phase[J]. Chemical Journal of Chinese Universities-chinese,2006-01-01,27(1):47-51. (iscas.ac.cn)
  • In this manuscript, we report the immobilization of graphene oxide (GO) onto a fused-silica capillary to form a potential stationary phase for use in open-tubular CEC. (conicet.gov.ar)
  • For the first time, a multi-lumen capillary (MLC) (126 parallel channels of 4.2 µm i.d) has been modified to produce a C18-functionalised silica porous layer open tubular (PLOT) capillary column for both on-capillary preconcentration and separation. (springer.com)
  • Hara T, Futagami S, Eeltink S, De Malsche W, Baron GV, Desmet G (2016) Very high efficiency porous silica layer open-tubular capillary columns produced via in-column sol-gel processing. (springer.com)
  • Capillary columns packed electrokinetically with 1.5-μm nonporous octadecylsilica particles are used to achieve rapid separations with high efficiencies. (semanticscholar.org)
  • Separations of the vitamin-E active compounds in edible oils were evaluated by capillary electrochromatography. (usda.gov)
  • Separations of lipid antioxidants, tocopherols (T), and tocotrienols (T3) on octylsilica (OS), octadecylsilica (ODS), phenylsilica, or silica were studied by capillary electrochromatography (CEC)-UV detection. (usda.gov)
  • Chiral separations of pharmaceuticals using capillary electrochromatography (CEC): an overview. (biomedsearch.com)
  • Gold nanoparticle enhanced capillary electrophoresis separations for Alzheimer's disease biomarker detection. (uncg.edu)
  • The development of this technique has been slowed due to technical problems with packing capillary columns. (dur.ac.uk)
  • In capillary electrochromatography capillaries, packed with HPLC stationary phase, are subjected to a high voltage. (wikipedia.org)
  • Capillary electrochromatography (CEC) combines the principles used in HPLC and CE. (wikipedia.org)
  • The capillaries is packed with HPLC stationary phase and a high voltage is applied to achieve separation is achieved by electrophoretic migration of the analyte and differential partitioning in the stationary phase. (wikipedia.org)
  • DMF is also utilized in chromatographic applications such as HPLC, capillary electrochromatography, and capillary electrophoresis. (sigmaaldrich.com)
  • As a natural expansion, we are contributing to furthering the development of capillary electrochromatography (CEC), a technique that combines the separation principles of both HPLC and CE. (okstate.edu)
  • In this study we have synthesized new polyethyleneimine (PEI) functionalized Mn(2)O(3), SiO(2), SnO(2), and ZrO(2) particles for the fabrication of packed capillary columns for CEC and CLC. (abo.fi)
  • Several monolithic chiral stationary phases for reversed-phase electrochromatography have been prepared within the confines of untreated fused silica capillaries by the direct copolymerization of the chiral monomer 2-hydroxyethyl methacrylate (N-L-valine-3,5-dimethylanilide) carbamate with ethylene dimethacrylate, 2-acrylamido-2-methyl-1-propanesulfonic acid and butyl or glycidyl methacrylate in the presence of a porogenic solvent. (edu.sa)
  • CE deploys a liquid separation technique using narrow bore, fused, silica capillaries to fractionate molecules. (prnewswire.com)
  • Pressure, voltage or a vacuum is used to introduce the sample to fused silica capillaries. (selectscience.net)
  • article{7f6274d2-59e3-4705-a96e-f4bb0009f833, abstract = {Reversed phase continuous full filling capillary electrochromatography with electrospray ionisation mass spectrometric detection was performed with highly sulphated poly [styrene-co-(lauryl methacrylate)-co-(divinylbenzene)] nanoparticles. (lu.se)
  • Colloque International 'Structures Chirales' -- ATP en Collaboration avec le NCRD (Israel) et CNRS (France) , Milly-La Forêt, France, 29.5.1979, Abstract. (uni-tuebingen.de)
  • Popular Abstract in Swedish Vad arbetar en analytisk kemist med? (dissertations.se)
  • A polymer-based neutral monolithic capillary column was prepared by radical polymerization of glycidyl methacrylate and ethylene dimethacrylate in a 100 lam id fused-silica capillary, and the prepared monolithic column was subsequently modified based on a ring opening reaction of epoxide groups with 1 M lysine in solution (pH 8.0) at 75 degrees C for 10 h to produce a lysine chemically bonded stationary phases in capillary column. (dicp.ac.cn)
  • Emphasizing microseparations and microfluidics, the Handbook of Capillary and Microchip Electrophoresis, Third Edition features new chapters describing the use of microchip electrophoresis and associated microtechniques, with a focus on the extraordinary breadth of work undertaken to expand CE methodologies in recent years. (routledge.com)
  • Fritless particle-loaded monoliths for chiral capillary electrochromatographic (CEC) separation were prepared. (wiley.com)
  • Novel polar monoliths were introduced for hydrophilic interaction capillary electrochromatography (HI-CEC). (okstate.edu)
  • Using the most hydrophilic monolithic capillary column and optimized elution conditions, a separation of N-(3,5-dinitrobenzoyl)leucine diallylamide enantiomers with an efficiency of 61000 plates m -1 and a resolution of 2.0 was achieved. (edu.sa)
  • In the early development of capillary UHPLC, home-built instruments were constructed that eliminated nearly all instrumental effects and gave a direct measure of column efficiency while also allowing for backpressures in excess of 50,000 psi [ 22 , 23 , 24 , 25 , 26 , 27 ]. (mdpi.com)
  • Reversed phase continuous full filling capillary electrochromatography with electrospray ionisation mass spectrometric detection was performed with highly sulphated poly [styrene-co-(lauryl methacrylate)-co-(divinylbenzene)] nanoparticles. (lu.se)
  • The detection and identification of the sample compounds were accomplished by hyphenating these capillary separation techniques with nuclear magnetic resonance (NMR) spectroscopy using a novel configuration of the detection capillary set-up. (ebscohost.com)
  • Separation efficiencies greater than 700 000 theoretical plates/m are obtained when detection (via UV-excited laser-induced fluorescence) is performed on the packed portion of the capillary. (semanticscholar.org)
  • This thesis concerns a highly efficient nanoparticle-based capillary electrochromatography separation technique and its coupling with mass spectrometric detection. (dissertations.se)
  • End-Column Detection for Capillary Zone Electrophoresis," Anal. (freepatentsonline.com)
  • Multiple Sheath-Flow Gel Capillary-Array Electrophresis for Multicolor Fluorescent DNA Detection," Anal. (freepatentsonline.com)
  • Capillary Electrophoresis Chips with Integrated Electrochemical Detection," Anal. (freepatentsonline.com)
  • Capillary zone electrophoretic analysis of carbohydrates by direct and indirect UV-detection. (uni-salzburg.at)
  • Recent applications of conductivity detection in capillary and chip electrophoresis. (cas.cz)
  • This configuration greatly simplifies the traditional capillary-LC-MS equipment requirements, via the removal of all connectors and additional capillary between injector and MS inlet, and is demonstrated herein with large volume sample loading and step-gradient elution/separation with sensitive MS detection. (springer.com)
  • 000137589 001__ 137589 000137589 005__ 20181203021605.0 000137589 0247_ $$2doi$$a10.1021/ac0109467 000137589 022__ $$a00032700 000137589 037__ $$aARTICLE 000137589 245__ $$aAn Integrated Fritless Colum for On-Chip Capillary Electrochromatography with Conventional Stationary Phases 000137589 260__ $$c2002 000137589 269__ $$a2002 000137589 336__ $$aJournal Articles 000137589 500__ $$a280 000137589 520__ $$aA new polymer device for use with conventional particulate stationary phases for on-chip, fritless, capillary electrochromatography (CEC) has been realized. (epfl.ch)
  • While commercial monolithic silica columns already show promising results on current IC instrumentation, polymer-based monolithic stationary phases are currently predominantly used in the capillary format on modified micro-IC systems. (edu.au)
  • Electrochromatography is a chemical separation technique in analytical chemistry, biochemistry and molecular biology used to resolve and separate mostly large biomolecules such as proteins. (wikipedia.org)
  • The latex particles on the capillary wall introduced anion-exchange interactions with the analytes, the strength of which could be moderated by the type and concentration of the competing ion used in the background electrolyte (BGE). (edu.au)
  • The effective ion-exchange capacity of the capillary, and also the resulting anion-exchange interactions with the analytes, could be increased by decreasing the capillary diameter. (edu.au)
  • In this study, the separation of acidic compounds by strong anion-exchange capillary electrochromatography (SAX-eEC) was carried cut. (dict.cn)
  • Very recently, we developed a multidimensional platform composed of capillary isoelectric focusing and CEC for human serum proteomics profiling. (okstate.edu)
  • A solid-phase extraction method based on an ionexchange retention mechanism has been used for in-line preconcentration of inorganic anions prior to their separation by capillary electrophoresis (CE). (edu.au)
  • A single capillary containing a preconcentration and a separation zone has been used in a commercial CE instrument without instrumental modification. (edu.au)
  • Capillary electrochromatography (CEC) is a chromatographic technique in which the mobile phase is driven through the chromatographic bed by electroosmosis. (wikipedia.org)
  • Determination of purity degree and counter-ion content in lecirelin by capillary zone electrophoresis and capillary isotachophoresis. (cas.cz)
  • Transient isotachophoresis in carrier ampholyte-based capillary electrophoresis for protein analysis. (cas.cz)
  • A pressurized capillary electrochromatography (pCEC) with monolithic column has been developed for the rapid separation and determination of five structurally related anthraquinones in Rhubarb. (sigmaaldrich.com)
  • Electroosmosis is the motion of liquid induced by an applied potential across a porous material, capillary tube, membrane or any other fluid conduit. (wikipedia.org)
  • The relationship between the linear velocity u of the liquid in the capillary and the applied electric field is given by the Smoluchowski equation as u = ϵ r ϵ 0 ζ E η {\displaystyle u=\epsilon _{r}\epsilon _{0}\zeta E\eta } where ζ is the potential across the Stern layer (zeta potential), E is the electric field strength, and η is the viscosity of the solvent. (wikipedia.org)
  • A Comparative Study of Capillary Zone Electrophoresis and High-Performance Liquid Cchromatography in the Analysis of Oligonucleotides and DNA. (uni-salzburg.at)
  • Studies on the analytical performance of a non-covalent coating with N,N-didodecyl-N,N-dimethylammonium bromide for separation of basic proteins by capillary electrophoresis in acidic buffers in 25- and 50-microm capillaries. (nih.gov)
  • In this thesis the possibilities of using capillary electrophoresis as a separation technique for analysis of proteins and microbubbles is presented.A complete analytical process consists of five necessary steps of which one is the actual analysis step. (dissertations.se)
  • This GO-incorporated capillary was then characterized by use of SEM, infrared spectroscopy, and measurements of EOF. (conicet.gov.ar)
  • Lynen F, BUICA A, De Villiers A, CROUCH A, Sandra P. An efficient slurry packing procedure for the preparation of columns applicable in capillary electrochromatography and capillary electrochromatography-electrospray-mass spectrometry. (ugent.be)
  • High-speed capillary electrochromatography was developed on both short and long packed columns with 2 mu m non-porous ODS as the stationary phase. (dicp.ac.cn)
  • Nonaqueous electrochromatography on C30 columns: separation of retinyl esters. (sigmaaldrich.com)
  • Theory of column optimization with limited pressure and analysis time, and fabrication of chemically bonded reversed-phase columns on etched borosilicate glass capillaries. (springer.com)
  • Consequently, a chiral alignment medium was used for the first time in chiral gel-based capillary electrochromatography with the four stereoisomers of the antimalaria drug mefloquine as test compounds. (mpg.de)
  • Capillary electrophoresis is a technique that separate compounds based on charge and size. (dissertations.se)
  • Determination of acid-base dissociation constants of amino- and guanidinopurine nucleotide analogs and related compounds by capillary zone electrophoresis. (cas.cz)
  • Capillary electrophoresis (CE) is a powerful analytical technique that is widely used in research and development and in quality control of pharmaceuticals. (elsevier.com)
  • En étant le membre unique du système discontinu, molécules avec la technique de CITP émigrez dans des zones définitives. (news-medical.net)
  • Les paramètres principaux pour cette technique sont pH, concentration en surfactant, tous les additifs et les revêtements en polymère qui sont employés sur la paroi capillaire. (news-medical.net)
  • In this study, modified gold nanoparticles were used as a pseudo stationary phase in a capillary electrochromatography technique. (uncg.edu)
  • A novel stationary phase for capillary electrochromatography has been prepared via photoinitiated grafting of two layers of polymer chains onto the pore surface of a porous polymer monolith. (edu.sa)
  • Fast analysis of capillary electrochromatography with non-porous ODS as the stationary phase[J]. ANALYTICAL LETTERS,1999,32(13):2679-2690. (dicp.ac.cn)
  • Capillary Electrochromatography: A Review," 357-372, 1997. (freepatentsonline.com)
  • Pesek JJ, Matyska MT (1997) Column technology in capillary electrophoresis and capillary electrochromatography. (springer.com)
  • Rapid separation and determination of structurally related anthraquinones in Rhubarb by pressurized capillary electrochromatography. (sigmaaldrich.com)
  • Capillary Electrophoretic Determination of the Component Monosaccharides in Hemicelluloses. (uni-salzburg.at)
  • Capillary electrophoresis method for determination of D-serine and its application for monitoring of serine racemase activity. (cas.cz)
  • Several new feature boxes are presented within the text's chapters including descriptions of Breath Alcohol Analyzers, Lap-on-a-Chip Technology, Modified Electrodes, Enzymatic Determination of Urea, GC/MS, C/MS, LC/MS/MS, and Capillary Electrophoresis in DNA Sequencing. (textbooks.com)
  • The coated capillary showed reversed electro-osmotic flow (EOF), allowing anions to be separated in the co-EOF mode. (edu.au)
  • Due to the presence of a stationary phase (SP) inside a capillary and the use of an electro-osmotic ow (EOF) as a driving force for the mobile phase, the user can bene t from properties, such as a high sample loading capacity, high ef ciencies, high peak capacities, and low sample and solvent consumptions [1]. (taylorfrancis.com)
  • Analysis of Sample Injection and Brand-Broadening in Capillary Electrophoresis Microchips," Techinal Proceedings of the MSM 2000, San Diego, CA, March 27-29, 2000. (freepatentsonline.com)
  • The thesis focuses on the development of new homogeneous gels for the separation of drug enantiomers, peptides, DNA and virus by electrophoresis and electrochromatography in capillaries and microchips. (dissertations.se)