Capillary electrochromatography of cholesterol and its ester derivatives.

Abstract

Separation of cholesterol and its ester derivatives using micellar electrokinetic chromatography is a challenge due to the extreme hydrophobicity of these compounds. In this work, an isocratic capillary electrochromatography (CEC) method has been developed to separate a complex mixture of cholesterol and its 12-ester derivatives. The proportions of mobile phase (tetrahydrofuran, acetonitrile, water), as well as the effects of acid modifiers, buffer concentrations, voltage, and temperature on the separation of cholesterol derivatives were investigated. Addition of a polymeric surfactant, poly(sodium N-undecanoyl-L-glycinate), to the mobile phase reduced migration time and improved resolution of the analytes. The CEC method developed allows baseline separation of a complex mixture of cholesterol and 12 ester derivatives in less than 40 min. Finally, the method is applied to the characterization of cholesterol, cholesterol linoleate, and cholesterol oleate extracted from atherosclerotic plaque deposits in the arterial walls of a human aorta.

• Authors: S Thiam, S A Shamsi, C W Henry 3rd, J W Robinson, I M Warner
• Journal: Analytical chemistry (Anal Chem) Vol. 72 Issue 11 Pg. 2541-6 (Jun 01 2000) ISSN: 0003-2700 [Print] United States
• PMID: 10857632 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, Non-P.H.S.)

Chemical References

• Cholesterol Esters
• Cholesterol

Topics

• Aged
• Aged, 80 and over
• Arteriosclerosis (metabolism)
• Cholesterol (analysis, metabolism)
• Cholesterol Esters (analysis, metabolism)
• Chromatography, High Pressure Liquid
• Electrophoresis, Capillary
• Humans