Enhancement of bactericidal effects of sodium hypochlorite in chiller waterwith food additive grade calcium hydroxide

[摘要] An alkaline agent, namely food additive grade calcium hydroxide (FdCa(OH)2) insolution at 0.17%, was evaluated for its bactericidal efficacies in chiller water withsodium hypochlorite (NaOCl) at a concentration of 200 ppm total residual chlorine. Withoutorganic material presence, NaOCl could inactivate Salmonella Infantis andEscherichia coli within 5 sec, but in the presence of fetal bovineserum (FBS) at 0.5%, the bactericidal effects of NaOCl were diminished completely.FdCa(OH)2 solution required 3 min to inactivate bacteria with or without 5%FBS. When NaOCl and FdCa(OH)2 were mixed at the final concentration of 200 ppmand 0.17%, respectively, the mixed solution could inactivate bacteria at acceptable level(103 reduction of bacterial titer) within 30 sec in the presence of 0.5% FBS.The mixed solution also inhibited cross-contamination with S. Infantis orE. coli on chicken meats. It was confirmed and elucidated thatFdCa(OH)2 has a synergistic effect together with NaOCl for inactivatingmicroorganisms.

[学科分类] 兽医学

[关键词] bacterial disinfection;food additive grade calcium hydroxide;inhibition of cross contamination;sodium hypochlorite;synergistic effect