High regioselectivity in the microbial oxidation of C-7, C-3 and C-12
hydroxyl groups of cholic, chenodeoxycholic, deoxycholic and hyocholic
acids 1-4 is reported. The tested microrganisms have been isolated fr
om 50 enviromental samples withdrawed from an industry that extracts a
nd purify bile acids. (C) 1998 Elsevier Science Ltd. All rights reserv
ed.