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Antibacterial activity of CuO-Ag Janus like nanoparticles against recombinant strain Escherichia coli

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Abstract

The toxic action of CuO–Ag Janus particles and a bicomponent mixture of CuO and Ag particles have been studied against a recombinant strain Escherichia coli K12 TG1 with cloned luxCDABE genes of marine bacteria Photobacterium leiognathi 54D10. An original method was used for the preparation CuO–Ag Janus like  nanoparticles by simultaneous electrical explosion of twisted Cu and Ag wires in a mixture of argon and oxygen gases. The bioluminescence inhibition on recombinant strain E. coli shows that CuO–Ag Janus NPs were effective. The concentration by 50% (EC50) for CuO–Ag Janus NPs was 0.03 ± 0.001 mg/ml (p < 0.05). The bioactivity of the bicomponent mixture of CuO and Ag NPs (EC50) was 0.25 ± 0.002 mg/ml (p < 0.05). The effective concentration of CuO–Ag Janus NPs against E. coli was comparatively lower than those of bicomponent mixture CuO and Ag against which explains the higher activity of CuO–Ag Janus NPs. The toxicity values of CuO and Ag as monocomponent nanoparticles were 2–32 times lower compared with the bicomponent nanoparticles. A dose-dependent inhibition of bacterial luminescence developed over time was noted. The result of contact E. coli with CuO–Ag Janus particles was 100% suppression of bacterial luminescence from the first minutes of contact occured starting with a content of 2.0 mg/ml and within the next 180 min. The effect of bioactivity prolonged in the final concentration of nanopowder (EC100 = 0.0625 ± 0.002 mg/ml) (p < 0.05). CuO–Ag Janus particles exhibited more pronounced antibacterial activity compared to CuO, Ag nanoparticles and their mechanical mixture.

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Acknowledgements

CuO-Ag nanoparticles have been prepared within the framework of the state task of ISPMS SB RAS, topic no FWRW-2022-0002.

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No external funding received.

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Fomina M., Sizova E. wrote the main manuscript text. Nechitailo K. prepared figures 1-7. All authors reviewed the manuscript.

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Correspondence to Marina Fomina.

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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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Fomina, M., Sizova, E. & Nechitailo, К. Antibacterial activity of CuO-Ag Janus like nanoparticles against recombinant strain Escherichia coli. Arch Microbiol 205, 205 (2023). https://doi.org/10.1007/s00203-023-03546-4

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  • DOI: https://doi.org/10.1007/s00203-023-03546-4

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