유전체장벽방전 플라즈마를 이용한 Escherichia coli 살균

목철균¹, 이태훈¹^,^*

Dielectric Barrier Discharge Plasma Inactivation of Escherichia coli

Chulkyoon Mok¹, Taehoon Lee¹^,^*

¹경원대학교 공과대학 식품생물공학과

¹Department of Food Science and Biotechnology, College of Engineering, Kyungwon University

^*Corresponding author: Chulkyoon Mok, Department of Food Science and Biotechnology, Kyungwon University, Seongnam, Gyeonggi-do, 461-701, Korea. Tel: +82-31-750-5403; Fax: +82-31-750-5273, E-mail: E-mail: mokck@kyungwon.ac.kr

ⓒ Copyright 2012 Korean Society for Food Engineering. This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Received: Jan 18, 2012; Revised: Feb 08, 2012; Accepted: Feb 08, 2012

Published Online: Feb 28, 2012

Abatract

Inactivation of Escherichia coli was attempted using dielectric barrier discharge plasma (DBDP) generated at different currents and electrode-gaps in order to explore its potential as a nonthermal sterilization technology for food products. DBDP showed a potent inactivation power against Escherichia coli especially in initial treatment stage up to 4 min although the effect retarded afterward, indicating that the inactivation pattern deviated from first order reaction kinetics. Instead, the inactivation pattern fitted well to Singh-Heldman model showing shape factors of 0.545-0.783 and D'-values of 0.565-3.268 min at different currents and electrode-gaps with a fixed sample treatment method. The greatest inactivation power of DBDP showing the smallest D'-value was observed at 1.25 A current and 2.65 mm electrode-gap. The inactivation effect was improved by uniaxially moving samples during the treatment. DBDP treatment with a biaxial movement of the samples boosted the inactivation power furthermore.

Keywords: dielectric barrier discharge plasma(DBDP); Escherichia coli; inactivation; sample movement