. Ciba Foundation conferences on istopes in biochemistry;. Radioactive tracers in biochemistry; Isotopes -- Physiological effect. CHOLESTEROL ACETATE D D ( D losl). COOCH-. CHjCOO'*--,-^''^:^-^ CH3COO DEHYDROISOANDROSTERONE ACETATE (I 31 D lost) D ( D lost) D ( D lost) Fig. 6. Distribution of the isotope in cholesterol obtained by the platinum catalysed exchange reaction. presented schematically in Fig. 6. The acetate dibromide of cholesterol from the exchange reaction was oxidized with chromic acid and from the reaction a sample of 3/3-hydroxy- chol-5-eni
. Ciba Foundation conferences on istopes in biochemistry;. Radioactive tracers in biochemistry; Isotopes -- Physiological effect. CHOLESTEROL ACETATE D D ( D losl). COOCH-. CHjCOO'*--,-^''^:^-^ CH3COO DEHYDROISOANDROSTERONE ACETATE (I 31 D lost) D ( D lost) D ( D lost) Fig. 6. Distribution of the isotope in cholesterol obtained by the platinum catalysed exchange reaction. presented schematically in Fig. 6. The acetate dibromide of cholesterol from the exchange reaction was oxidized with chromic acid and from the reaction a sample of 3/3-hydroxy- chol-5-enic acid was isolated. This compound contained 1 • 20 atoms of deuterium per molecule as compared with 2 • 48 atoms of deuterium per molecule in the cholesterol. The iso- tope lost, 1 • 28 atoms of deuterium per molecule, must have been attached to the i^opropyl group removed by oxidation, or to C-24, the carbon atom which is now the carboxyl group. While the possibility exists that the isotope was attached to ISOTOPES. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ciba Foundation. Philadelphia, Blakiston
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