Abstract
The present study investigated and compared the effect of growth temperature on the susceptibility of biofilm-detached and planktonic Staphylococcus aureus cells, to benzalkonium chloride (BAC). This study also highlights the impact of BAC on the bacterial physiology and the role of membrane fluidity regulation as a bacterial resistance mechanism. The minimum inhibitory concentration of BAC was characterized with micro-dilution growth inhibition assay. The BAC treatment was performed on S. aureus cultured at 20 °C and 37 °C, for 24 h. The morphology of S. aureus cells was examined using scanning electron microscopy. The loss of bacterial membrane integrity after BAC treatment was studied by monitoring the intracellular potassium ion leakage using the atomic absorption spectroscopy. The bacterial membrane total fatty acid composition, controlling the membrane fluidity, was analyzed by GC/MS. The results showed that the resistance of S. aureus cells to BAC increased with the increase of growth temperature. The planktonic cells were more susceptible to BAC than biofilm-detached ones. The rise of growth temperature resulted in an increase of S. aureus membrane rigidity. Furthermore, a higher membrane fluidity was observed in planktonic cells when compared to that in the biofilm-detached ones. The resistance of S. aureus seems to depend on the growth temperature. Compared to planktonic cells, biofilm-detached cells showed a greater resistance to BAC. The BAC targets and disturbs the bacterial membrane. Membrane fluidity modulation is likely a one of resistance mechanisms for S. aureus to BAC at the cellular scale. Therefore, disinfection procedures, in food sector, should be adapted for bacteria detached from biofilm.
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The authors thank the Haut de France region and FEDER (Fonds européen de développement régional) for their financial support.
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This work was carried out within the framework of ALIBIOTECH (Agroalimentaire et Biotechnologie, Nord Pas-de-Calais region) program.
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Khelissa, S.O., Abdallah, M., Jama, C. et al. Comparative study of growth temperature impact on the susceptibility of biofilm-detached and planktonic Staphylococcus aureus cells to benzalkonium chloride. Ann Microbiol 69, 291–298 (2019). https://doi.org/10.1007/s13213-018-1419-y
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DOI: https://doi.org/10.1007/s13213-018-1419-y