Diversified antibiotic resistance and sensitivity patterns induced by quaternary ammonium compounds
Kun Yang , Huijie Lu , Lizhong Zhu
Front. Environ. Sci. Eng. ›› 2025, Vol. 19 ›› Issue (8) : 103
Diversified antibiotic resistance and sensitivity patterns induced by quaternary ammonium compounds
The extensive application of quaternary ammonium compounds (QACs) has led to a significant increase in their mass load in wastewater treatment plants (WWTPs). However, little is known about how QACs contribute to the emergence of resistance against different antibiotics. This study aims to reveal the structure- and dose–response relationships between various QACs and their induced antibiotic resistance and sensitivity patterns. 16 QACs were tested for their capacity in inducing multidrug resistance in activated sludge (AS) and AS-isolated E. coli. For AS, the exposure to three representative QACs resulted in up to a 32-fold increase in resistance against norfloxacin, tetracycline, kanamycin and gentamicin. However, the resistance to cefepime (CEF), azithromycin, and rifampicin remained largely unchanged. As a representative strain isolated from AS, the exposure of E. coli to QACs at 1 mg/L exhibited no induced resistance, whereas the MIC for CEF showed a decrease by 62.5%–87.5%. This was likely attributed to downregulation of proton motive force and efflux pump, which promoted the intracellular accumulation of CEF. Additionally, we identified the high-risk structural characteristics of QACs and emphasized the critical importance of determining the threshold concentrations for QACs risk management. This study provides valuable guidance for the assessment and management of environmental resistance risks caused by increased QACs in diverse environments.
Quaternary ammonium compounds / Antibiotic resistance / Wastewater treatment plants / Pharma RQSAR analysis / Dose-effect relationship / Proton motive force
● QACs could induce diversified antibiotic resistance patterns in activated sludge. | |
| ● QACs with shorter alkyl chains have greater capacity to induce antibiotic resistance. | |
● QACs enhance cefepime sensitivity through the downregulation of PMF and efflux. | |
● The importance of risk management threshold concentrations for QACs is emphasized. |
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Higher Education Press 2025
Supplementary files
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