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Influence of spore size distribution, gas mixture, and process time on the removal rate of B. subtilis spores in low-pressure plasmas

Fiebrandt, Marcel and Roggendorf, Julian and Moeller, Ralf and Awakowicz, Peter (2019) Influence of spore size distribution, gas mixture, and process time on the removal rate of B. subtilis spores in low-pressure plasmas. Journal of Physics D: Applied Physics, 52 (12), p. 125402. Institute of Physics (IOP) Publishing. DOI: 10.1088/1361-6463/aafdcf ISSN 0022-3727

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Official URL: http://dx.doi.org/10.1088/1361-6463/aafdcf

Abstract

The size reduction of B. subtilis spores due to removal of biological material in low-pressure plasmas was analyzed in a double inductively coupled plasma system. Argon, nitrogen, and oxygen at 5 Pa were used as feed gases to investigate the impact of different reactive species and high energy radiation on the process. The spore size was determined using scanning electron microscopy images and the length of thousands of spores were evaluated using an automated algorithm. By applying a statistical test the precision of the mean spore size determination was increased and the applicability of a normal distribution to describe the spore size distribution was demonstrated. The removal rate was found to vary depending on the process gas as well as on the process time and was found to be largest with a mixture of nitrogen and oxygen and lowest in pure argon. With increasing treatment time the removal rate decreases significantly and tends to stop in all gases and inhibits the complete removal of spores and potentially hazardous biological material. Possible explanations for this effect are the aggregation of non-volatile compounds or the formation of cross-linked layers which significantly reduce the etching efficiency.

Item URL in elib:https://elib.dlr.de/126391/
Document Type:Article
Title:Influence of spore size distribution, gas mixture, and process time on the removal rate of B. subtilis spores in low-pressure plasmas
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Fiebrandt, MarcelFaculty of Electrical Engineering and Information Technology, Institute for Electrical Engineering and Plasma Technology, Ruhr University Bochum, Bochum, Germany; fiebrandt (at) aept.rub.deUNSPECIFIED
Roggendorf, JulianFaculty of Electrical Engineering and Information Technology, Institute for Electrical Engineering and Plasma Technology, Ruhr University Bochum, Bochum, GermanyUNSPECIFIED
Moeller, RalfRadiation Biology Department, Institute of Aerospace Medicine, German Aerospace Center (DLR), Cologne, Germany; ralf.moeller (at) dlr.dehttps://orcid.org/0000-0002-2371-0676
Awakowicz, PeterFaculty of Electrical Engineering and Information Technology, Institute for Electrical Engineering and Plasma Technology, Ruhr University Bochum, Bochum, GermanyUNSPECIFIED
Date:15 January 2019
Journal or Publication Title:Journal of Physics D: Applied Physics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:52
DOI :10.1088/1361-6463/aafdcf
Page Range:p. 125402
Publisher:Institute of Physics (IOP) Publishing
ISSN:0022-3727
Status:Published
Keywords:plasma sterilization, plasma decontamination, B. subtilis spores, spore size distribution, low-pressure plasma
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Vorhaben Strahlenbiologie
Location: Köln-Porz
Institutes and Institutions:Institute of Aerospace Medicine > Radiation Biology
Deposited By: Kopp, Kerstin
Deposited On:15 Mar 2019 09:28
Last Modified:15 Mar 2019 09:28

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