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Molecules 2013, 18(4), 4018-4025; doi:10.3390/molecules18044018

Effect of a Combination of Low Level Ozone and Metal Ions on Reducing Escherichia coli O157:H7 and Listeria monocytogenes

1
Department of Animal Resources Technology, Gyeongnam National University of Science and Technology, Gyeongnam 660-758, Korea
2
Department of Cancer and Cell Biology, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA
3
Department of Food Science and Technology, Institute of Food Science, Pukyong National University, Busan 608-737, Korea
4
Department of Food Science and Biotechnology, Kangwon National University, Chuncheon 200-701, Korea
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 16 February 2013 / Revised: 1 April 2013 / Accepted: 1 April 2013 / Published: 4 April 2013
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Abstract

Ozonated water has been used as a strong antimicrobial agent against foodborne pathogens. In this study, the combined effect of low level ozonated water and different added components, including 0.2% starch and metal ions (1 mM CuCl2·2H2O and 0.1 mM AgNO3), on inactivation of Escherichia coli O157:H7 and Listeria monocytogenes was investigated. Treatment with 0.4 ppm ozonated water for 30 min resulted in a maximum log reduction in E. coli O157:H7 and L. monocytogenes compared to initial bacterial counts. The log reductions of bacteria in a starch solution containing ozonated water were slightly higher than those in ozonated water alone. Furthermore, the log reductions of E. coli O157:H7 (2.59 and 4.71 log cfu/mL) and L. monocytogenes (2.53 and 4.28 log cfu/mL) in a metal ion solution containing 0.2 and 0.4 ppm ozone for 30 min were significantly higher than those of the water and starch added groups (p < 0.05). These results indicate that a combination of ozonated water and metal ions may be useful as a antimicrobial agent.
Keywords: ozonated water; metal ion; combination; E. coli; L. monocytogenes ozonated water; metal ion; combination; E. coli; L. monocytogenes
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Kang, S.-N.; Kim, K.-J.; Park, J.-H.; Lee, O.-H. Effect of a Combination of Low Level Ozone and Metal Ions on Reducing Escherichia coli O157:H7 and Listeria monocytogenes. Molecules 2013, 18, 4018-4025.

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