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Journal of Lipid Research, Vol 29, 363-376, Copyright © 1988 by Lipid Research, Inc.

ARTICLES

Rapid quantitative apolipoprotein analysis by gradient ultracentrifugation and reversed-phase high performance liquid chromatography

TA Hughes, MA Moore, P Neame, MF Medley and BH Chung
Department of Medicine, University of Alabama, Birmingham.

A new methodology for the analysis of lipoprotein composition using a combination of gradient ultracentrifugation and high performance liquid chromatography was used to determine the differences in lipoprotein composition between non-hyperlipidemic men and women. Lipoproteins from each subject were separated into six subfractions: VLDL, IDL, LDL, and three subfractions of HDL by a single gradient ultracentrifugation spin of less than 5 hr. The HDL subfractions were designated HDL-L (the lightest density subfraction, rich in apoCs and poor in apoA-II), HDL-M (the middle subfraction, rich in apoA-II), and HDL-D (the most dense, relatively poor in both the apoCs and apoA-II). The concentrations of the water-soluble apolipoproteins in each subfraction were determined using reversed-phase HPLC. The concentrations of apoB and the lipid components of the lipoproteins were determined by chemical and enzymatic methods. This methodology proved to be highly reproducible when performed on fresh plasma samples and we were able to identify many sex-associated differences in lipoprotein composition. This methodology is the only nonimmunological technique available for analyzing lipoprotein composition that offers such a combination of accuracy, speed, and completeness.
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