Enhanced Antimicrobial Potency and Therapeutic Index of a Defined C12 Quaternary Ammonium Compound

EQ12, a C12 quaternary ammonium compound, inhibited and killed key SSTI pathogens with MICs of 2.3–40 micrograms/mL and MBCs of 4.7–40 micrograms/mL.

• Why it matters: SSTIs are difficult to treat due to antimicrobial resistance, polymicrobial infections, and biofilm-mediated tolerance, while topical options are often limited by cytotoxicity, weak antibiofilm effects, and resistance emergence.
• What they did: The study measured MICs and MBCs by broth microdilution against Staphylococcus aureus (MSSA and MRSA), Acinetobacter baumannii, Klebsiella pneumoniae, and Pseudomonas aeruginosa, used species-selective plating in staphylococcal–P. aeruginosa co-cultures, crystal violet biofilm assays, and 14-passage serial passage resistance testing.
• The result: EQ12 inhibited biofilm formation at sub-MIC to near-MIC levels and did not induce resistance in MRSA, P. aeruginosa, or A. baumannii>, supporting further topical development for SSTI-associated pathogens.

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