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Physical mechanisms of inactivation of Bacillus subtilis spores using cold atmospheric plasmas

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journal contribution
posted on 28.08.2009, 08:34 by Xu-Tao Deng, J.J. Shi, Michael G. Kong
This paper presents a detailed study of the potential physical mechanisms of the microbial inactivation by cold atmospheric plasmas. With the Bacillus subtilis spores as a model microorganism and an atmospheric-plasma plume in helium flow, optical emission spectroscopy and inactivation kinetics are used to demonstrate the dominating role played by the reactive oxygen species (e.g., atomic oxygen and OH) as well as the minor contributions of the UV photons, heat, charged particles, and electric fields. To differentiate the concentrations of the reactive oxygen species, an atmospheric helium-oxygen plasma is also used for the spore inactivation. Results with the helium and the helium-oxygen plasmas are contrasted to highlight how the production of the spore-killing oxygen species may be enhanced.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Citation

DENG, X., SHI, J.J. and KONG, M.G., 2006. Physical mechanisms of inactivation of Bacillus subtilis spores using cold atmospheric plasmas. IEEE Transactions on Plasma Science, 34(4), pt. 2, pp.1310-1316.

Publisher

© IEEE

Version

VoR (Version of Record)

Publication date

2006

Notes

This article was published in the journal, IEEE Transactions on Plasma Science [© 2006 IEEE] and is also available at: http://ieeexplore.ieee.org/ Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.

ISSN

0093-3813

Language

en