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Fluorimetric assay for hydrolytic activity of cholesterol esterase in rat tissues.

A sensitive fluorimetric method for the assay of the hydrolytic activity of cholesterol esterase in enzyme preparations from rat tissues using cholesterol oleate as a substrate is described. The increase in the amount of cholesterol in the enzyme reaction is measured fluorimetrically by using the cholesterol oxidase-peroxidase-3-(p-hydroxyphenyl) propionic acid system. The assay requires only 45-150 μg of protein of preparations from the liver, testis, adipose tissue of the mesentery and adrenal gland.