The efficacy of slightly acidic electrolyzed water (SAEW)to inactivate foodborne pathogens and indigenous microbiota on shell eggs were evaluated and compared to ClO2 solution.Eggs were artificially inoculated with S.enteritidis,E.coli O157∶ H7 and S.aureus and sprayed with SAEW,alkaline electrolyzed water followed by SAEW (AKEW + SAEW),ClO2 solution and deionized water for 10 s at room temperature.The effect of SAEW on the natural microbiota of eggs was also studied.SAEW,AKEW + SAEW,and ClO2 solution treatments significantly reduced the population of S.enteritidis by l.60 to 2.49,1.88 to 2.52 and l.52 to 2.07 log10CFU/g,E.coli O157∶ H7 by 2.21 to 2.78,2.30 to 3.10 and l.64 to 1.89 log10CFU/g,and S.aureus by l.20 to 1.39,1.25 to 1.41,and l.09 to 1.35 log10CFU/g,respectively relative to control.The natural microbiota were reduced by 1.39 to 1.90,1.51 to 1.97 and 0.74 to 1.33 10910 CFU/g for total aerobic bacteria,1.50 to 1.79,1.62 to 2.22 and l.01 to 1.41 log10 CFU/g for coliforms,0.99 to 1.86,1.90 to 2.23 and 0.65 to 0.95 log10 CFU/g for Staphylococcus and 0.34 to 0.45,0.38 to 1.22 and 0.04 to 0.31 10910 CFU/g for moulds and yeasts,respectively.SAEW and ClO2 solution with available chlorine of 60 mg/L showed no significant bactericidal difference for foodborne pathogens (P＞0.05 ),whereas the bactericidal activity of SAEW for S.enteritidis,E.coli O157∶ H7,total aerobic bacteria and Staphylococcus was significantly higher than ClO2 solution at 80 mg/L and 100 mg/L of available chlorine(P＜0.05 ).SAEW was more effective in combination with AKEW.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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