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Applied and Environmental Microbiology, September 1999, p. 4276-4279, Vol. 65, No. 9
Department of Animal Science, University of
Connecticut, Storrs, Connecticut 06269,1 and
Center for Food Safety and Quality Enhancement, College of
Agricultural and Environmental Sciences, University of Georgia,
Griffin, Georgia 30223-17972
Received 14 December 1998/Accepted 18 June 1999
The efficacy of electrolyzed oxidizing water for inactivating
Escherichia coli O157:H7, Salmonella
enteritidis, and Listeria monocytogenes was
evaluated. A five-strain mixture of E. coli O157:H7,
S. enteritidis, or L. monocytogenes of
approximately 108 CFU/ml was inoculated in 9 ml of
electrolyzed oxidizing water (treatment) or 9 ml of sterile, deionized
water (control) and incubated at 4 or 23°C for 0, 5, 10, and 15 min;
at 35°C for 0, 2, 4, and 6 min; or at 45°C for 0, 1, 3, and 5 min.
The surviving population of each pathogen at each sampling time was
determined on tryptic soy agar. At 4 or 23°C, an exposure time of 5 min reduced the populations of all three pathogens in the treatment
samples by approximately 7 log CFU/ml, with complete inactivation by 10 min of exposure. A reduction of
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Efficacy of Electrolyzed Oxidizing Water for
Inactivating Escherichia coli O157:H7, Salmonella
enteritidis, and Listeria monocytogenes
7 log CFU/ml in the levels of the
three pathogens occurred in the treatment samples incubated for 1 min
at 45°C or for 2 min at 35°C. The bacterial counts of all three
pathogens in control samples remained the same throughout the
incubation at all four temperatures. Results indicate that electrolyzed
oxidizing water may be a useful disinfectant, but appropriate
applications need to be validated.
*
Corresponding author. Mailing address: Center for Food
Safety and Quality Enhancement, College of Agricultural and
Environmental Sciences, University of Georgia, 1109 Experiment St.,
Griffin, GA 30223-1797. Phone: (770) 228-7284. Fax: (770)
229-3216. E-mail: mdoyle{at}cfsqe.griffin.peachnet.edu.
Applied and Environmental Microbiology, September 1999, p. 4276-4279, Vol. 65, No. 9
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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