Provitamin D in animal tissues

Abstract

Herring roe and milt contain small amounts of material showing the absorption bands of 7-dehydrosterol and a substance with lambda max. 272 m[mu] in cyclohexane. Pigskin contains 0.002% 7-dehydrocholesterol. The sterol from pig intestine contains small quantities of materials with lambda max. 253 m[mu], 265 m[mu] and 272 m[mu], respectively and traces of 7-dehydrosterol. Horse intestine yields crude cholesterol containing 0.014-0.042% 7-dehydrosterol. Cholesterol from stomach outer layers contains about 0.013%. Cholesterol from ox intestine contains 0.011% and that from sheep intestine 0.037% 7-dehydrosteroid.