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Colonic absorption of sulfated and nonsulfated bile acids in rat.

Absorption of sulfated and nonsulfated chenodeoxycholic and glycochenodeoxycholic acid was studied in the colon and the data were compared with the absorption rates in the ileum. Absorption of nonsulfated chenodeoxycholic acid in the colon was in the same range of magnitude as in the ileum. Glycochenodeoxycholic acid absorption in the colon was lower than in the terminal ileum. Sulfated bile acids were not absorbed in the colon. In the ileum, absorption of sulfated bile acids was significantly (p less than 0.01) lower than the absorption of nonsulfated bile acids. Little absorption of sulfated bile acids in the ileum and lack of absorption in the colon both contribute to the rapid turnover and excretion of bile acid sulfates.