NDLI: Decontamination of Bacterial Spores by a Microwave Plasma Torch

Content Provider	IEEE Xplore Digital Library
Author	Kuo, S.P. Tarasenko, O. Peng Yao Levon, K.
Copyright Year	2005
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Polytech. Univ. Brooklyn, NY (Kuo, S.P.)
Abstract	Summary form only given. Air plasma in a highly energized state, contains radicals such as atomic oxygen, excited oxygen molecules and ozone that are highly reactive. These reactive oxygen species (ROS) can destroy just about all kinds of organic contaminants more effectively than the thermal method. This non-thermal destruction mechanism primarily involves the chemical reactions of ROS with nucleic acids, lipids, proteins and sugars. These chemical modifications result in protein cleavage, aggregation and loss of catalytic and structural function by distorting secondary and tertiary protein structures. These oxidative proteins are irreversibly modified and cannot be repaired. This occurrence is known as protein degradation. Through these chemical reactions, most contaminants are converted by ROS to carbon dioxide and water. The emission spectroscopy of an arc-seed microwave plasma torch (MPT) was examined and the spectral line of O I (777.194 nm) indicating relatively high atomic oxygen content in the torch was detected. This torch was applied to demonstrate this oxidation process for the decontamination of biological warfare agents. In the decontamination experiments, Bacillus cereus was chosen as a simulant of Bacillus anthracis spores for biological agent and the airflow rate was fixed at 0.393 l/s that leads to the maximum concentration of atomic oxygen produced by the torch as well as a good torch size. The results of experiments using dry samples showed that all spores were killed in less than 8 seconds at 3 cm distance, 12 seconds at 4 cm distance, and 16 seconds at 5 cm distance away from the nozzle of the torch. We now extend the experimental effort to decontaminate wet samples. The results will be presented and discussed
Sponsorship	Plasma Sci. Appl. Comm. IEEE Nucl. Plasma Sci. Soc.
Starting Page	257
Ending Page	257
File Size	1349000
Page Count	1
File Format	PDF
ISBN	0780393007
ISSN	07309244
DOI	10.1109/PLASMA.2005.359338
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-20
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Decontamination Microorganisms Fungi Proteins Chemicals Plasma chemistry Atomic measurements Lipidomics Degradation Carbon dioxide
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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