Fig. 5

Typical HPLC profiles of bile acids in different samples. a Reference standards. b Natural bear bile powder. c Chicken bile powder (CBP). d Biotransformation products from CBP. Compound 1: tauroursocholic acid (TUCA). Compound 2: tauroursodeoxycholic acid (TUDCA). Compound 3: tauro-7-keto lithocholic acid (T-7-KLCA). Compound 4: taurocholic acid (TCA). Compound 5: taurochenodeoxycholic acid (TCDCA)