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Treating Surfaces with a Cold Atmospheric Pressure Plasma using the COST-Jet
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Portable and affordable cold air plasma source with optimized bactericidal effect.

Myron Klenivskyi1, Josef Khun1, Laura Thonová1,2

  • 1Department of Physics and Measurements, University of Chemistry and Technology, Prague, Czech Republic.

Scientific Reports
|July 10, 2024
PubMed
Summary

This study presents a low-cost, handheld cold air plasma source for biomedical use. The device effectively inactivates a broad range of bacteria, fungi, and yeasts, primarily due to reactive oxygen species like ozone.

Keywords:
Bactericidal effectCold air plasmaCorona dischargeIon windReactive oxygen and nitrogen species

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Area of Science:

  • Biomedical Engineering
  • Plasma Physics
  • Microbiology

Background:

  • Cold atmospheric plasma (CAP) offers promising biomedical applications.
  • Development of accessible and cost-effective CAP devices is crucial for wider adoption.
  • Understanding the mechanisms of CAP's antimicrobial action is essential.

Purpose of the Study:

  • To report the development and characterization of a low-cost, handheld cold air plasma source for biomedical applications.
  • To evaluate the bactericidal efficacy of this plasma source against a diverse range of microorganisms.
  • To investigate the role of reactive species in the observed antimicrobial effects.

Main Methods:

  • Construction of a simple, low-power (1.4 W) corona discharge plasma source using readily available components.
  • Optimization of the plasma source for maximum bactericidal effect using Escherichia coli.
  • Testing the antimicrobial effectiveness against Staphylococcus aureus, Pseudomonas aeruginosa, Candida albicans, Trichophyton interdigitale, and Deinococcus radiodurans.
  • Analysis of long-lived reactive species (ozone, nitrogen oxides, hydrogen peroxide, nitrite, nitrate) generated by the plasma.

Main Results:

  • The developed plasma source demonstrated significant inactivation of all tested microorganisms within minutes (10^5-10^7 CFU reduction).
  • High efficacy was observed against Gram-positive bacteria, Gram-negative bacteria, yeasts, and microfungi.
  • A strong correlation was found between ozone concentration and the bactericidal effect, suggesting reactive oxygen species as the primary antimicrobial agents.

Conclusions:

  • The low-cost, handheld cold air plasma source is effective against a wide spectrum of pathogens.
  • The study provides a comprehensive analysis of corona discharge's bactericidal effects and reactive species formation.
  • This accessible technology holds potential for various biomedical and sterilization applications.