Enrofloxacin metabolism by Mucor ramannianus was investigated as a model fo
r the biotransformation of veterinary fluoroquinolones. Cultures grown in s
ucrose-peptone broth were dosed with enrofloxacin. After 21 days, 22% of th
e enrofloxacin remained. Three metabolites were Identified: enrofloxacin N-
oxide (62% of the total absorbance), N-acetylciprofloxacin (8.0%), and dese
thylene-enrofloxacin (3.5%).