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.
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This manuscript has no associated data or the data will not be deposited. [Authors’ comment: Data available on request from the authors - The data that support the findings of this study are available from the corresponding author, A. J., upon reasonable request.]
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Acknowledgements
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.
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UC and ZLP conceived and planned the experiments. NH, MM, DV and MĐ performed plasma treatment of bacteria and liquid chemistry analyses along with the interpretation of those results. NŠ, KS and AJ performed plasma diagnostics and electrical characterization along with interpretation of those results. AJ wrote the original draft, and all co-authors helped with manuscript revision.
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Jurov, A., Škoro, N., Spasić, K. et al. Helium atmospheric pressure plasma jet parameters and their influence on bacteria deactivation in a medium. Eur. Phys. J. D 76, 29 (2022). https://doi.org/10.1140/epjd/s10053-022-00357-y
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DOI: https://doi.org/10.1140/epjd/s10053-022-00357-y