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Metabolism of cholestane-3 beta,5 alpha,6 beta-triol. II. Identification of two major neutral metabolites in the rat.

Rats were given a single oral dose of cholestane-3beta,5alpha,6beta-triol-4-(14)C, and their feces were collected. The two major neutral metabolites were separated and isolated by use of solvent fractionation and chromatographic methods. The metabolites were identified as cholestane-3beta,5alpha-diol-6-one and a mixture of long-chain fatty acid esters of cholestane-3beta,5alpha,-6beta-triol. Cholestane-3beta,5alpha-diol-6-one was identified using thin-layer and gas-liquid chromatography, infrared spectroscopy, and the spectrum produced by reaction with 65% sulfuric acid. The mixed esters of cholestane-3beta,5alpha,6beta-triol were subjected to basic hydrolysis, and the steroid moiety was identified using the same techniques employed for cholestane-3beta,5alpha-diol-6-one. The fatty acids were analyzed by gas-liquid chromatography of their methyl esters.