Results 181 to 190 of about 783,055 (207)

Separation of retinoids by micellar electrokinetic capillary chromatography

Journal of Chromatography A, 1997
Abstract In this study, we have developed a micellar electrokinetic capillary chromatography (MEKC) method with diode-array detection to separate five important retinoids, including retinol, retinal, retinoic acid, retinyl acetate and retinyl palmitate.
You-Zung Hsieh, Kuang-Lung Kuo
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Micellar electrokinetic capillary chromatography of algal toxins

Journal of High Resolution Chromatography, 1997
AbstractRecent methods employed for the analysis of algal toxins have focused on high performance liquid chromatography. However these methods suffer from poor resolution, poor efficiency, and long analysis times. This study involves the investigation of a number of toxins including nodularin, microcystin LR, YR, and RR which are cyclic peptides ...
Wilson John, Mark W. Raynor, Bruce Rae
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Micellar Electrokinetic Capillary Chromatography with Cationic Surfactants

Journal of Liquid Chromatography, 1993
Abstract A series of alkyltrimethylammonium chloride and bromide surfactants were evaluated in micellar electrokinetic capillary chromatography (MECC) of urea herbicides, alkylbenzenes and phenylalkylalcohols. The magnitude of the anodal electroosmotic flow obtained with these cationic micellar phases was largely unaffected by the length of the alkyl ...
Daniel Crosby, Ziad El Rassi
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Analysis of Rhubarb by Micellar Electrokinetic Capillary Chromatography

Journal of Natural Products, 1995
A micellar electrokinetic capillary Chromatographic method for the separation and quantitative determination of aloe-emodin, emodin, and rhein in rhubarb samples was established. The running electrolyte was a mixture of 0.025 M 3-(cyclohexylamino)-1-propane sulfonic acid (CAPS) buffer [containing 0.025 M sodium dodecyl sulfate (SDS)] and acetonitrile ...
Zong, Y.Y., Che, C.T.
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Gradient elution for micellar electrokinetic capillary chromatography

Analytical Chemistry, 1988
A method for performing gradient elution in micellar electrokinetic capillary chromatography is developed. The influence of temperature and mobile phase organic solvent concentration on capacity factors is presented and attributed to changes in phase ratio and solute distribution coefficient.
Anthony T. Balchunas, Michael J. Sepaniak   +1 more
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Determination of saikosaponins by micellar electrokinetic capillary chromatography

Journal of Chromatography A, 1997
Abstract In this study, we examine the feasibility of determining saikosaponins a, b1, b2, c and d, i.e., the bioactive components in Bupleuri Radix, using the micellar electrokinetic capillary chromatography technique. Results obtained from using different anion surfactants, bile salt or sodium dodecyl sulfate (SDS), are also compared. By using bile
You-Zung Hsieh, Hsi-Ya Huang
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Determination of flavonoids by micellar electrokinetic capillary chromatography

Journal of Chromatography A, 1993
Abstract HPCE based on cetyltrimethylammonium bromide (CTAB) or cholate micellar electrokinetic capillary chromatography (MECC) was found suitable for the separation of individual flavonoid glycosides following a rapid and simple technique of isolation, purification and group separation.
Charlotte Bjergegaard, Søren Michaelsen, Kirsten Mortensen, Hilmer Sørensen   +3 more
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Separation of coumarins by micellar electrokinetic capillary chromatography

Journal of Chromatography A, 1995
Nine coumarins were successfully separated simultaneously using micellar electrokinetic capillary chromatography with 4-hydroxybenzoic acid as an internal standard. A carrier composed of buffer solution (20 mM sodium dodecyl sulfate-15 mM sodium borate-15 mM sodium dihydrogenphosphate)-acetonitrile (24:1) was found to be the most suitable electrolyte ...
Cherng-Tsern Chen, Shuenn-Jyi Sheu
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Separation of polymxins by micellar electrokinetic capillary chromatography

Journal of Chromatography A, 1993
Abstract High-efficiency separations of basic polypeptides from the polymxin group with equal or nearly equal mass to charge ratios were achieved by micellar electrokinetic chromatography in dynamically modified capillaries using a zwitterionic surfactant as an additive to the running buffer.
Helle Kjærgaard Kristensen, Steen Honoré Hansen   +1 more
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A monomolecular pseudostationary phase for micellar electrokinetic capillary chromatography

Journal of High Resolution Chromatography, 1992
Christopher P Palmer, Harold M McNair
exaly