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

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3 Citations (Scopus)
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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 focussed 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 reactive oxygen and nitrogen species, especially hydrogen peroxide and medium solvated charges. Graphical abstract: [Figure not available: see fulltext.].

Original languageEnglish
Article number29
Number of pages11
JournalEuropean Physical Journal D: Atomic, Molecular, Optical and Plasma Physics
Volume76
Issue number2
Early online date15 Feb 2022
DOIs
Publication statusPublished online - 15 Feb 2022

Bibliographical note

Funding Information:
This work was carried out within projects NATO SPS, and Slovenian Research Agency grant J4-1770. This article is also based upon work from COST Action PLAGRI—CA19110, supported by COST (European Cooperation in Science and Technology), www.cost.eu . K. S. acknowledges also partial funding from bilateral project Serbia-Slovenia from MESTD of Republic of Serbia. We thank Dr. Nevena Puac for useful advices related to electrical characterization.

Publisher Copyright:
© 2022, The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature.

Keywords

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

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