To investigate the microbial biotransformation of veterinary fluoroquinolon
es, Mucor ramannianus was grown in sucrose/peptone broth with sarafloxacin
for 18 days. Cultures were extracted with ethyl acetate and extracts were a
nalyzed by liquid chromatography. The two metabolites (26% and 15% of the A
(280), respectively) were identified by mass and H-1 nuclear magnetic reson
ance spectra as N-acetylsarafloxacin and desethylene-N-acetylsarafloxacin,
The biological formation of desethylene-N-acetylsarafloxacin has not been p
reviously observed.