Abstract:Electrolyzed water ice is a relatively new preservation and cold sterilization technology developed in recent years. To study the changes in physicochemical properties of electrolyzed water ice during storage and their effect on inactivation of Vibrio parahaemolyticus,five types of electrolyzed water ice prepared from different concentration of sodium chloride solution(0.75,1,1.25,1.5,1.75 g/L) and were frozen at-36 ℃.And a set of physicochemical properties, including pH values,oxidation reduction potential(ORP) and available chlorine concentration(ACC),were measured on storage hours(0-10 h),and the bactericidal efficiency on Vibrio parahaemolyticus by electrolyzed water ice was studied during storage. The results showed that pH value did not have significant difference(p >0.05) from 0 to 6h,while after 6 h the rate of pH change of electrolyzed water ice prepared from NaCl ≤1 g/L was less than that of NaCl concentration >1 g/L. ORP and ACC decreased gradually,and the ORP changes almost follow the same trend. However,the ACC loss rate of NaCl >1.5 g/L was higher than that of NaCl ≤1.5 g/L. Compared sterilization with all other adjacent concentration difference,the difference of the bactericidal efficiency on Vibrio parahaemolyticus by the electrolyzed water ice of NaCl concentration 1.5 g/L and 1.25 g/L,the highest ratio was to 117.6 times. According to the correlation analysis,the respective correlation coefficients of pH,ORP,ACC on the bactericidal capacity were 0.831,0.787 and 0.944.
