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Light, Copper, Action: Visible-Light Illumination Enhances Bactericidal Activity of Copper Particles.

Aline L Schio1, Michele S de Lima1, Rafaele Frassini2

  • 1Postgraduate Program in Materials Science and Engineering, University of Caxias do Sul, Caxias do Sul 95070-560, Rio Grande do Sul, Brazil.

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Summary

Metallic copper microparticles (CuMPs) and nanoparticles (CuNPs) show size-dependent antibacterial properties. CuMPs exhibit enhanced disinfection under light, offering a cost-effective alternative for self-cleaning surfaces against bacteria.

Keywords:
bactericidal activitycoppermicroparticlesnanoparticlesphotoactivitysize-dependent

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Area of Science:

  • Materials Science
  • Microbiology
  • Nanotechnology

Background:

  • Rising antibiotic resistance necessitates novel antimicrobial strategies.
  • Copper's intrinsic biocidal properties offer potential for infection control.
  • Limited research exists on the photo-activated bactericidal effects of microscale copper particles.

Purpose of the Study:

  • To investigate the bactericidal efficacy of microscale copper particles (CuMPs) and nanoscale copper particles (CuNPs).
  • To compare the antimicrobial activity of CuMPs and CuNPs under dark and white LED light illumination.
  • To evaluate the potential of copper particles as light-assisted self-cleaning disinfection materials.

Main Methods:

  • Minimum bactericidal concentration (MBC) assays against *Staphylococcus aureus* and *Escherichia coli*.
  • Comparative analysis of copper particle performance in absence and presence of light.
  • Supporting data from fluorescence microscopy and atomic absorption spectroscopy.

Main Results:

  • CuMPs demonstrated significant light-enhanced bactericidal activity against both bacteria.
  • Light illumination increased log reduction by 65.2% for *S. aureus* and 166.7% for *E. coli* with CuMPs.
  • CuNPs exhibited superior broad-spectrum bactericidal activity, even in the absence of light.

Conclusions:

  • Both CuMPs and CuNPs display size- and dose-dependent biocidal activity.
  • CuMPs show competitive photoactivity, making them viable for light-assisted disinfection.
  • Copper microparticles offer a cost-effective, self-cleaning solution for pathogen containment.