Hydrolysis of retinylpalmitate and retinylacetate was studied in rat blood, liver tissue, intestine, testes, placenta and embryonic liver. The retinylpalmitate hydrolase activity was observed only in walls of small intestine and, less distinctly, - in liver tissue of some animals. Retinylpalmitate was hydrolyzed in rat liver very slowly, that was determined apparently by the metabolic requirements of the organism. The retinylpalmitate hydrolase activity occurred in dog blood after absorption of vitamin A oil solutions. This phenomenon was probably related to an increased secretion of pancreatic enzymes into blood after the loading with oils.
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