title: Comparative studies of bile salts. A new type of bile salt from Arapaima gigas (Cuvier) (family Osteoglossidae).
abstract: 1. Arapaima gigas bile salts were hydrolysed by alkali or cleaved with dioxan-trichloroacetic acid to give cholic acid, arapaimic acid, arapaimol-A and arapaimol-B. 2. I.r., n.m.r. and mass spectroscopy and [alpha](D) measurements indicated that arapaimic acid and arapaimol-A and -B are respectively 2alpha,3alpha,7alpha,12alpha-tetrahydroxy-5beta,25in-cholestan-26-oic acid, 5beta,25R-cholestane-2beta,3alpha,7alpha,12alpha,26-pentol and 5beta-cholestane-2beta,3alpha,7alpha,12alpha,26,27-hexol. 3. Partial synthesis of 2beta,3alpha,7alpha,12alpha-tetrahydroxy-5alpha- and -5beta-cholan-24-oic acid and their spectral examination fully confirmed these conclusions. 4. A. gigas bile salts show primitive features in that they comprise alcohol sulphates and a C(27) acid; they are also specialized in showing 2beta-hydroxylation.
mesh_terms: D000818:Animals; D001647:Bile Acids and Salts / Q000302:isolation & purification*; D002855:Chromatography, Thin Layer; D004147:Dioxins; D005399:Fishes / Q000378:metabolism*; D006868:Hydrolysis; D007259:Infrared Rays; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D008722:Methods; D013057:Spectrum Analysis; D014238:Trichloroacetic Acid
chemical_list: D001647:Bile Acids and Salts; D004147:Dioxins; D014238:Trichloroacetic Acid