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Combination treatment of chlorine dioxide gas and aerosolized sanitizer for inactivating foodborne pathogens on spinach leaves and tomatoes

Author:
Park, Sang-Hyun, Kang, Dong-Hyun
Source:
International journal of food microbiology 2015 v.207 pp. 103-108
ISSN:
0168-1605
Subject:
Escherichia coli O157, Listeria monocytogenes, Salmonella Typhimurium, additive effect, anti-infective properties, chlorine dioxide, color, food pathogens, leaves, peracetic acid, sanitizers, spinach, texture, tomatoes
Abstract:
The objective of this study was to evaluate the antimicrobial effect of chlorine dioxide (ClO2) gas and aerosolized sanitizer, when applied alone or in combination, on the survival of Escherichia coli O157:H7, Salmonella Typhimurium, and Listeria monocytogenes inoculated onto spinach leaves and tomato surfaces. Spinach leaves and tomatoes were inoculated with a cocktail of three strains each of the three foodborne pathogens. ClO2 gas (5 or 10ppmv) and aerosolized peracetic acid (PAA) (80ppm) were applied alone or in combination for 20min. Exposure to 10ppmv of ClO2 gas for 20min resulted in 3.4, 3.3, and 3.4 log reductions of E. coli O157:H7, S. Typhimurium, and L. monocytogenes on spinach leaves, respectively. Treatment with 80ppm of aerosolized PAA for 20min caused 2.3, 1.9, and 0.8 log reductions of E. coli O157:H7, S. Typhimurium, and L. monocytogenes, respectively. Combined treatment of ClO2 gas (10ppmv) and aerosolized PAA (80ppm) for 20min caused 5.4, 5.1, and 4.1 log reductions of E. coli O157:H7, S. Typhimurium, and L. monocytogenes, respectively. E. coli O157:H7, S. Typhimurium, and L. monocytogenes on tomatoes experienced similar reduction patterns to those on spinach leaves. As treatment time increased, most combinations of ClO2 gas and aerosolized PAA showed additive effects in the inactivation of the three pathogens. Combined treatment of ClO2 gas and aerosolized PAA produced injured cells of three pathogens on spinach leaves while generally did not produce injured cells of these pathogens on tomatoes. Combined treatment of ClO2 gas (10ppmv) and aerosolized PAA (80ppm) did not significantly (p>0.05) affect the color and texture of samples during 7days of storage.
Agid:
5411603