Abstract
Sample preparation and high-pressure liquid-chromatography separation methods useful for the study of retinoic acid metabolism are reported. The sample preparation procedure does not cause significant degradation of retinoic acid, and the gradient high-pressure liquid-chromatography separation method gives excellent separation of the major metabolites of retinoic acid. These methods were used to examine the metabolites of retinoic acid in blood, trachea and lung, testes, kidneys and small intestine of vitamin A-deficient rats dosed subcutaneously with 2 micrograms of [11,12-3H] retinoic acid. At 6h after dosing, a total of eight metabolites of retinoic acid produced in vivo were found in the tissues examined. Of these, four were found in most of the epithelial tissues examined, and therefore may be of interest as possible active metabolites in the epithelial functions of vitamin A.
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