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. 1974 Jul;6(1):54–59. doi: 10.1128/aac.6.1.54

Rapid Microassays for Clindamycin and Gentamicin When Present Together and the Effect of pH and of Each on the Antibacterial Activity of the Other

L D Sabath 1, Inge Toftegaard 1
PMCID: PMC429047  PMID: 15828171

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.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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