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Journal of Lipid Research, Vol 24, 1261-1267, Copyright © 1983 by Lipid Research, Inc.
ARTICLES |
G Egusa, DW Brady, SM Grundy and BV Howard
A method has been described for the measurement of apoB concentration and specific activity in very low density lipoprotein (VLDL) and low density lipoprotein (LDL) during metabolic studies. For measurement of specific activity, apoB was separated from other apolipoproteins and lipids by precipitation in, and subsequent washing with, isopropanol. For determination of apoB concentration, equal volumes of lipoprotein and isopropanol were mixed, and the protein content of the apoB precipitate was measured by the difference between total lipoprotein protein and the protein measured in the supernatant. Evidence that there was no apoB solubilization in isopropanol and that precipitated apoB was virtually free of soluble apolipoproteins was obtained by electrophoresis. Lipid contamination of the apoB precipitate was less than 1%. The methods were applicable to VLDL, intermediate density lipoprotein (IDL), and LDL from normolipemic patients with protein concentrations between 187 micrograms/ml and 1898 micrograms/ml. The data obtained using isopropanol were highly correlated with those using tetramethylurea, and recoveries of apoB were similar. Furthermore, the isopropanol method has been demonstrated to yield consistent data for apoB specific activities in a study of VLDL, IDL, and LDL metabolism.
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