Summary. Retinal, the aldehyde of vitamin A, has been isolated from the bovine corpus luteum and identified by ultra-violet and infra-red spectroscopy, thin layer chromatography, preparation of the 2,4-dinitrophenylhydrazone derivative and a colour test with rhodanine. The concentration of retinal was approximately 1·2 μg/g of retinal corpus luteum tissue.
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Austern et al. (1969) studied this question.
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