Rapid Microassays for Clindamycin and Gentamicin When Present Together and the Effect of pH and of Each on the Antibacterial Activity of the Other
- 1 July 1974
- journal article
- Published by American Society for Microbiology in Antimicrobial Agents and Chemotherapy
- Vol. 6 (1), 54-59
- https://doi.org/10.1128/aac.6.1.54
Abstract
Gentamicin was measured in the presence of clindamycin by using as the assay organism a strain of Staphylococcus aureus that was resistant to clindamycin; clindamycin was measured in the presence of gentamicin by using Clostridium perfringens as the assay organism. Both assays were in agar diffusion systems, were rapid (2 to 4 h), and had errors of less than 10%. Neither antibiotic antagonized or synergized with the other against a variety of organisms. The pK of clindamycin was 7.3, and the pK of gentamicin was 8.2. Gentamicin was 100 or more times as active in alkaline medium against both gram-positive and gram-negative organisms, but clindamycin showed a striking pH effect on activity only with gram-positive organisms.Keywords
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