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Journal of Lipid Research, Vol 20, 1040-1043, Copyright © 1979 by Lipid Research, Inc.
ARTICLES |
U Piran and RJ Morin
A rapid and accurate single step procedure is described for the assay of lecithin-cholesterol acyltransferase activity. After incubation, using radiolabeled cholesterol as the substrate, an ethanolic solution of digitonin is added directly to the incubation mixture to extract the lipids. Excess cholesterol is then added, and the labeled cholesterol- digitonide along with denatured proteins are sedimented by low speed centrifugation, leaving the labeled esterified cholesterol in solution. An aliquot of the supernatant is counted in an aqueous scintillation mixture. The method correlates well with the established thin-layer chromatographic procedure using either lecithin-cholesterol vesicles or heat-inactivated plasma as the substrate for lecithin-cholesterol acyltransferase.
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