title: Enzymic determination of 3 alpha-, 7 alpha-, and 12 alpha-hydroxyl groups of fecal bile salts.
abstract: We used microbial 3 alpha, 7 alpha-, and 12 alpha-hydroxysteroid dehydrogenases to quantify 3 alpha-, 7 alpha-, and 12 alpha-hydroxyl groups in human feces. Samples collected over a 48-h period were lyophilized, extracted, and reconstituted by a modification of the method of DeWael et al. (clin. Chim. Acta 79: 465--470, 1977), then quantified enzymically by use of three group-specific hydroxysteroid dehydrogenase preparations. Total values for the three hydroxyl groups are given for 18 healthy humans. The ratio of 3 alpha-OH groups/7 alpha-OH groups/12 alpha-OH groups was 34.4 (SD 5.9)/25.2 (SD 6.4)/40.4 (SD 7.7) for the 18 samples.
mesh_terms: D001647:Bile Acids and Salts / Q000032:analysis*; D002250:Carbon Radioisotopes; D002635:Chenodeoxycholic Acid / Q000032:analysis; D002793:Cholic Acids / Q000032:analysis; D003840:Deoxycholic Acid / Q000032:analysis; D005243:Feces / Q000032:analysis*; D006801:Humans; D006913:Hydroxysteroid Dehydrogenases; D006914:Hydroxysteroids / Q000032:analysis*; D008095:Lithocholic Acid / Q000032:analysis; D012016:Reference Values; D013379:Substrate Specificity
chemical_list: D001647:Bile Acids and Salts; D002250:Carbon Radioisotopes; D002793:Cholic Acids; D006914:Hydroxysteroids; D003840:Deoxycholic Acid; D002635:Chenodeoxycholic Acid; D008095:Lithocholic Acid; D006913:Hydroxysteroid Dehydrogenases