Results 171 to 180 of about 2,028 (207)

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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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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Analysis of Anthraquinones by Micellar Electrokinetic Capillary Chromatography

Phytochemical Analysis, 1997
A micellar electrokinetic capillary chromatographic method for the separation of anthraquinone positional isomers was established. The running electrolytes used in this method were 0.03 M sodium dodecyl sulphate (SDS) in 0.03 M borate buffer (pH 9) containing 10% acetonitrile for dihydroxy- and dihydroxy-methoxy-methylanthraquinones, 0.08 M SDS in 0.03 
Junko Koyama, Izumi Toyokuni, Kiyoshi Tagahara   +2 more
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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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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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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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Optimization strategies in micellar electrokinetic capillary chromatography

Chromatographia, 1995
Computer-assisted procedures for the one-parameter optimization of the surfactant concentration and the concentration of urea or D-glucose as modifiers in micellar electrokinetic capillary chromatography have been developed. These procedures permit a rapid optimization of one parameter on the basis of only two experiments. Predicted values are compared
U. Pyell, U. Bütehorn
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Analysis of water-soluble vitamins by micellar electrokinetic capillary chromatography

Journal of Chromatography A, 1988
Seven water-soluble vitamins were determined simultaneously by micellar electrokinetic capillary chromatography with UV detection. All these compounds were separated from each other within ca. 22 min by using a carrier containing sodium dodecyl sulphate as the surfactant. On-column detection at 254 nm with ethyl p-aminobenzoate as the internal standard
S, Fujiwara, S, Iwase, S, Honda
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Determination of piribedil in pharmaceutical formulations by micellar electrokinetic capillary chromatography

Analytical and Bioanalytical Chemistry, 2004
A fast and simple micellar electrokinetic capillary chromatographic method was developed for the analysis of piribedil in pharmaceutical formulations. The effects of buffer concentration, buffer pH, sodium dodecyl sulphate (SDS) concentration, organic modifier, applied voltage and injection time were investigated.
Ceren, Yardimci, Incilay, Süslü, Nuran, Ozaltin   +2 more
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