Helium atmospheric pressure plasma jet parameters and their influence on bacteria deactivation in a medium

Andrea Jurov, Nikola Škoro, Kosta Spasić, Martina Modić, Nataša Hojnik, Danijela Vujošević, Milena Đurović, Zoran Petrović, Uroš Cvelbar

Research output: Contribution to journalArticlepeer-review

Abstract

Atmospheric pressure plasmas are becoming relevant in local microbial deactivation and other combined effects of plasmas on living organisms. For this reason, our research was focused on optimisation of atmospheric pressure plasma jet (APPJ) parameters to complete the deactivation of different bacteria strains in a medium. Different helium APPJ treatments with different discharge parameters were used, such as input voltages and gas flows. To better understand plasma properties behind complete bacteria deactivation at optimised discharge parameters, optical and electrical plasma jet diagnostics were performed, including electrical characterisation of the plasma source, optical emission spectroscopy of the plasma plume and intensified charged coupled device imaging of the discharge behaviour for every set of plasma parameters. Then, the resulting plasma liquid chemistry was assessed to establish the connections between reactive species generated in the gaseous and liquid phases. The most efficient deactivation was
found for higher discharge powers and gas flow rates, and that was linked to higher densities of reactiveoxygen and nitrogen species, especially hydrogen peroxide and medium solvated charges.
Original languageEnglish
Article number29
Number of pages11
JournalEuropean Physical Journal D: Atomic, Molecular, Optical and Plasma Physics
Volume76
Early online date15 Feb 2022
DOIs
Publication statusPublished - 15 Feb 2022

Keywords

  • atmospheric pressure plasma jet
  • bacteria deactivation
  • plasma-liquid medium interaction

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