title: 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.affiliation: Department of Chemistry, Louisiana State University, Baton Rouge 70803, USA.
authors.forename: S
authors.initials: S
authors.lastname: Thiam
authors.forename: S A
authors.initials: SA
authors.lastname: Shamsi
authors.forename: C W
authors.initials: CW
authors.lastname: Henry
authors.forename: J W
authors.initials: JW
authors.lastname: Robinson
authors.forename: I M
authors.initials: IM
authors.lastname: Warner
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001161:Arteriosclerosis / Q000378:metabolism; D002784:Cholesterol / Q000032:analysis* / Q000378:metabolism; D002788:Cholesterol Esters / Q000032:analysis* / Q000378:metabolism; D002851:Chromatography, High Pressure Liquid; D019075:Electrophoresis, Capillary; D006801:Humans
chemical_list: D002788:Cholesterol Esters; D002784:Cholesterol