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

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 bact...

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Bibliographic Details
Published in:The European physical journal. D, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2022-02, Vol.76 (2), Article 29
Main Authors: Jurov, Andrea, Škoro, Nikola, Spasić, Kosta, Modic, Martina, Hojnik, Nataša, Vujošević, Danijela, Đurović, Milena, Petrović, Zoran Lj, Cvelbar, Uroš
Format: Article
Language:English
Subjects:
Applications of Nonlinear Dynamics and Chaos Theory
Atmospheric pressure
Atomic
Bacteria
Charge coupled devices
Deactivation
Flow velocity
Gas flow
Helium
Hydrogen peroxide
Liquid phases
Microorganisms
Molecular
Optical and Plasma Physics
Optical emission spectroscopy
Optical properties
Optimization
Parameters
Physical Chemistry
Physics
Physics and Astronomy
Plasma
Plasma jets
Plasmas (physics)
Quantum Information Technology
Quantum Physics
Regular Article – Plasma Physics
Spectroscopy/Spectrometry
Spintronics
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Summary: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
ISSN:1434-6060
1434-6079
DOI:10.1140/epjd/s10053-022-00357-y