Inactivation of <i>Staphylococcus</i> aureus by the synergistic action of charged and reactive plasma particles

Espedito VASSALLO; Matteo PEDRONI; Tiziana SILVETTI; Stefano MORANDI; Milena BRASCA

doi:10.1088/2058-6272/ab8c32

Plasma Science and Technology > 2020 > 22(8): 85504-085504. > DOI: 10.1088/2058-6272/ab8c32

Espedito VASSALLO, Matteo PEDRONI, Tiziana SILVETTI, Stefano MORANDI, Milena BRASCA. Inactivation of Staphylococcus aureus by the synergistic action of charged and reactive plasma particles[J]. Plasma Science and Technology, 2020, 22(8): 85504-085504. DOI: 10.1088/2058-6272/ab8c32

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Inactivation of Staphylococcus aureus by the synergistic action of charged and reactive plasma particles

¹CNR, Istituto per la Scienza e Tecnologia dei Plasmi, Via R. Cozzi 53, 20125 Milan, Italy
²CNR, Istituto di Scienze delle Produzioni Alimentari, Via G. Celoria 2, 20133 Milan, Italy

Funds: The research leading to these results is partly funded by the research agreement between Istituto di Fisica del Plasma and Kenosistec Srl (protocol CNR-IFP No. 63, 22/01/2018).

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Received Date: January 27, 2020
Revised Date: April 19, 2020
Accepted Date: April 21, 2020

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Abstract

Abstract

In this paper, a low-pressure capacitively coupled plasma discharge sustained in an argonoxygen mixture was studied in order to evaluate its properties in terms of inactivation of Staphylococcus aureus. The plasma parameters as electron temperature and plasma density were measured by the Langmuir probe (N_e ≈ 10¹⁵ m⁻³, T_e ≈ 1.5 eV), while the neutral atom density was in the range of 10²¹ m⁻³. In the plasma phase, oxygen radicals were taken as reference of the reactive species with antimicrobial activity, and oxygen spectral lines, over a range of plasma process parameters, were investigated by the optical emission spectroscopy. Optimal plasma conditions were found, and a count reduction of 4 log in a few minutes of the bacterium proves the potentiality of an industrial grade plasma reactor as a sterilization agent.
- Staphylococcus aureus ,
- capacitively coupled plasma,
- bacteria decontamination

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References (38)

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