Rapid Microbiological Assay for Chloramphenicol and Tetracyclines

Abstract

An agar diffusion assay for chloramphenicol and tetracyclines is described, using inhibition of hemolysis byClostridium perfringensas a biological indicator of antimicrobial activity. Well-defined zones formed after a 1.5- to 2-h incubation in an anaerobic chamber or after 3 h using a GasPak system. Serum levels of chloramphenicol as low as 2.0 μg/ml could be reproducibly determined with this method. Concurrent presence of gentamicin did not influence the assay. Levels of penicillin G were also reproducibly determined with this method, although use of stable zones of growth inhibition which would form after overnight incubation were a more convenient end point for this bactericidal drug. The hemolytic assay withC. perfringensis a reproducible, accurate, and rapid method for determination of levels for chloramphenicol and tetracyclines.