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Synergistic antimicrobial effect of nisin−octanoic acid nanoemulsions against E. coli and S. aureus

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Abstract

Food safety is a major public health concern all over the world. Therefore, the prevention of food contamination is becoming extremely crucial. In this study, an antimicrobial nanoemulsion composed of water-soluble nisin and fat-soluble octanoic acid was successfully prepared. The results showed that the average particle size and the polymer dispersity index of the nisin−octanoic acid (NOA) nanoemulsion were around 52.21 nm and 0.253, respectively. The NOA nanoemulsion required less amounts of nisin and octanoic acid to achieve the effective antimicrobial effect against Escherichia coli and Staphylococcus aureus. In addition, the growth curves of E. coli and S. aureus were determined. The OD600 of NOA nanoemulsion was significantly lower than free nisin after being incubated for 24 h (p < 0.001), indicating that the antimicrobial effect of NOA nanoemulsion was outstanding. Meanwhile, the synergistic antimicrobial property of NOA nanoemulsion against E. coli and S. aureus was significantly better than free nisin under nonacid conditions (p < 0.05). Overall, the results of this study may provide guidance for the further application of nisin in more forms.

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The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

The authors gratefully acknowledge the fnancial assistance offered by the Natural Science Foundation of Zhejiang Province (Grant No. LY16C020005).

Funding

This work was supported by the Natural Science Foundation of Zhejiang Province (Grant No. LY16C020005).

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Contributions

WY wrote the main manuscript text. BL designed the methodology and conducted the research. FZ and LG provided the language assistance. HG and JQ provided writing assistance and critical review. All authors read and approved the final manuscript.

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Correspondence to Hui Guo.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Communicated by Yusuf Akhter.

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Guo, H., Yang, W., Lei, B. et al. Synergistic antimicrobial effect of nisin−octanoic acid nanoemulsions against E. coli and S. aureus. Arch Microbiol 205, 203 (2023). https://doi.org/10.1007/s00203-023-03545-5

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  • DOI: https://doi.org/10.1007/s00203-023-03545-5

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