Results 131 to 140 of about 1,107 (169)

Micellar Electrokinetic Capillary Chromatography of Proteins

Analytical Biochemistry, 1993
Separations of model proteins obtained under denaturing conditions in the presence of micellar concentrations of ionic surfactants displayed high resolution and efficiency using either bare silica or C18-derivatized silica capillaries. Superior migration time reproducibility was achieved through the use of the C18-derivatized capillaries (run-to-run ...
M A, Strege, A L, Lagu
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Mixed micellar electrokinetic chromatography of corticosteroids

ELECTROPHORESIS, 1994
AbstractMixed micellar electrokinetic chromatography (MMEKC) using mixtures of bile salt surfactants and/or sodium dodecyl sulfate (SDS) was employed to separate a group of corticosteroids. Resolution in electrokinetic chromatography (EKC) can be greatly enhanced by the use of mixed micellar systems due to the fact that the composition of the mixed ...
J G, Bumgarner, M G, Khaledi
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Separation of estrogens by micellar electrokinetic chromatography

Journal of Chromatography A, 1995
Capillary electrophoresis of the sex hormone estrogens using different buffer components was investigated. Free zone electrophoresis with 10 mM phosphate buffer (pH 11.5) or 10 mM phosphate buffer with 10-20% methanol was not effective in separating the ten estrogens used in this study.
K C, Chan, G M, Muschik, H J, Issaq, P K, Siiteri   +3 more
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Micellar electrokinetic chromatography of polyamines and monoacetylpolyamines

Journal of Chromatography A, 2001
A selective procedure for qualitative and quantitative analysis of ten polyamines by micellar electrokinetic chromatography (MEKC) was developed. Benzoylated polyamines and acetylpolyamines in micellar phase of SDS (10 mM) were separated at 25 degrees C by 20 mM borate buffer pH 8.5, containing 8% ethanol, with an applied voltage of 25 kV (5 microA ...
G, Taibi, M R, Schiavo, P C, Rindina, R, Muratore, C M, Nicotra   +4 more
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Profiling of cocaine by micellar electrokinetic chromatography.

Journal of capillary electrophoresis, 1998
The potential of micellar electrokinetic chromatography (MEKC) for the profiling of cocaine samples is described. An MEKC system containing sodium dodecyl sulfate (SDS) and methanol was optimized using a test mixture of cocaine, its common impurities (benzoylecgonine, norcocaine, tropacocaine, and trans-cinnamoylcocaine), and several degradation ...
Hilhorst, M.J, van Hout, M.W J, Somsen, G.W, Franke, J.P., de Jong, G.J.   +4 more
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Micelle Stacking in Micellar Electrokinetic Chromatography

Analytical Chemistry, 2007
In order to understand the role of stacked micelles in sample preconcentration, it is necessary to understand the factors that contribute to the micelle stacking phenomenon. Various MEKC background electrolyte (BGE) solutions were prepared in the presence of Sudan III in order to monitor the micelle stacking phenomenon in the anionic sodium dodecyl ...
Braden C, Giordano, Carl I D, Newman, Philip M, Federowicz, Greg E, Collins, Dean S, Burgi   +4 more
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Separation of cardiac glycosides by micellar electrokinetic chromatography and microemulsion electrokinetic chromatography

Journal of Chromatography A, 1997
The interest of micellar electrokinetic chromatography (MEKC) and microemulsion electrokinetic chromatography (MEEKC) for the resolution of four cardiac glycosides is demonstrated. First, the influence of some parameters on the resolution of the solutes in MEKC such as the concentration of the surfactant, pH, addition of organic modifiers and urea is ...
L, Debusschère, C, Demesmay, J L, Rocca, G, Lachatre, H, Lofti   +4 more
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Selectivity manipulation in micellar electrokinetic chromatography

Journal of Pharmaceutical and Biomedical Analysis, 1992
Micellar electrokinetic chromatography (MEKC) permits the separation of electrically neutral analytes by chromatographic principles in a capillary electrophoresis system. The most effective way to obtain high resolution in MEKC is to increase the separation factor, as in conventional chromatography.
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Capillary Separation: Micellar Electrokinetic Chromatography

Annual Review of Analytical Chemistry, 2009
Micellar electrokinetic chromatography (MEKC), a separation mode of capillary electrophoresis (CE), has enabled the separation of electrically neutral analytes. MEKC can be performed by adding an ionic micelle to the running solution of CE without modifying the instrument.
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Determination of sunscreen agents by micellar electrokinetic chromatography

Journal of Pharmaceutical and Biomedical Analysis, 1995
The separation of UV-A and UV-B sunscreens by micellar electrokinetic chromatography has been studied. The optimized method, which involves the presence of an anionic surfactant (sodium dodecyl sulphate) and an organic modifier in the background electrolyte, was applied to determine these sunscreens in cosmetic products. Identification was achieved by "
P. PIETTA, A. BRUNO, P. MAURI, C. GARDANA, R. MAFFEI FACINO, M. CARINI   +5 more
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