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Spraying efficiency of slightly acidic electrolyzed water for reducing foodborne pathogens and natural microflora on shell eggs

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  131596933,  2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: http://dx.doi.org/10.13031/aim.20131596933) @2013
Authors:   Li Ni, Baoming Li, Wei Cao, Zhihui Yan, Weichao Zheng
Keywords:   Slightly acidic electrolyzed water spraying disinfection pathogens eggs

Abstract. The efficacy of slightly acidic electrolyzed water (SAEW) to inactivate foodborne pathogens and indigenous microbiota on shell eggs were evaluated and compared to that of chlorine dioxide (ClO2) solution. The eggs were artificially inoculated with S.enteritidis, E.coli O157:H7 and S.aureus and sprayed with SAEW, alkaline electrolyzed water (AlEW) followed by SAEW (AlEW+SAEW) and ClO2 solution at available chlorine concentrations (ACC) of 60, 80 and 100 mg L-1, respectively, and with alkaline electrolyzed water and deionized water as control. SAEW, AlEW+SAEW, and ClO2 solution treatments significantly reduced the population of S.enteritidis by 1.52 to 2.36 log10 CFU g-1, E.coli O157:H7 by 1.69 to 3.68 log10 CFU g-1, and S.aureus by 1.16 to 2.82 log10 CFU g-1, respectively relative to control. The effect of SAEW on the natural microbiota of fresh egg shells was also studied. Spraying shell eggs with SAEW and ClO2 solution at the ACC of 60 mg L-1 had no significant bactericidal difference for foodborne pathogens and indigenous microbiota on shell eggs, whereas the bactericidal activity of SAEW for E.coli O157:H7, S.aureus, total aerobic bacteria and moulds and yeasts was significantly higher than that of ClO2 solution at ACCs of 80 and 100 mg L-1. Microbial counts decreased with the increasing SAEW concentrations, SAEW was found to be more effective when used in conjunction with AIEW. Results indicate that the disinfectant efficacy of SAEW is equivalent to or higher than that of ClO2 solution, and therefore SAEW shows the potential to be used for sanitization of egg shells as an environmentally friendly disinfection agent.

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