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Copper nanoparticles, among other metal particles, have sparked increased attention due to their applications in electronics, optics, catalysis, and antimicrobial agents.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>This investigation explains the biosynthesis and characterization of copper nanoparticles from soil strains, <jats:italic>Niallia circulans<\/jats:italic> G9 and <jats:italic>Paenibacillus<\/jats:italic> sp. S4c by an eco-friendly method. The maximum reduction of copper ions and maximum synthesis CuNPs was provided by these strains. Biogenic formation of CuNPs have been characterized by UV\u2013visible absorption spectroscopy, X-ray diffraction, Fourier transform infrared spectroscopy, X-ray analysis and transmission electron microscopy analysis. Using UV-visible spectrum scanning, the synthesised CuNPs\u2019 SPR spectra showed maximum absorption peaks at \u03bb<jats:sub>304&amp;308\u00a0nm<\/jats:sub>. TEM investigation of the produced CuNPs revealed the development of spherical\/hexagonal nanoparticles with a size range of 13\u2013100\u00a0nm by the G9 strain and spherical nanoparticles with a size range of 5\u201340\u00a0nm by the S4c strain. Functional groups and chemical composition of CuONPs were also confirmed. The antimicrobial activity of the biosynthesized CuNPs were investigated against some human pathogens. CuNPs produced from the G9 strain had the highest activity against <jats:italic>Candida albicans<\/jats:italic> ATCC 10,231 and the lowest against <jats:italic>Pseudomonas aeruginosa<\/jats:italic> ATCC 9027. CuNPs from the S4c strain demonstrated the highest activity against <jats:italic>Escherichia coli<\/jats:italic> ATCC 10,231 and the lowest activity against <jats:italic>Klebsiella pneumonia<\/jats:italic> ATCC 13,883.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusion<\/jats:title>\n                <jats:p>The present work focused on increasing the CuNPs production by two isolates, <jats:italic>Niallia circulans<\/jats:italic> G9 and <jats:italic>Paenibacillus<\/jats:italic> sp. S4c, which were then characterized alongside. The used analytics and chemical composition techniques validated the existence of CuONPs in the G9 and S4c biosynthesized nano cupper. CuNPs of S4c are smaller and have a more varied shape than those of G9 strain, according to TEM images. In terms of antibacterial activity, the biosynthesized CuNPs from G9 and S4c were found to be more effective against <jats:italic>Candida albicans<\/jats:italic> ATCC 10,231 and <jats:italic>E. coli<\/jats:italic> ATCC 10,231, respectively.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s12934-024-02422-0","type":"journal-article","created":{"date-parts":[[2024,5,28]],"date-time":"2024-05-28T03:54:34Z","timestamp":1716868474000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["A comparative study of the biosynthesis of CuNPs by Niallia circulans G9 and Paenibacillus sp. S4c strains: characterization and application as antimicrobial agents"],"prefix":"10.1186","volume":"23","author":[{"given":"Nahla M. 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