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  • Title: Enhancement of bactericidal effects of sodium hypochlorite in chiller water with food additive grade calcium hydroxide.
    Author: Toyofuku C, Alam MS, Yamada M, Komura M, Suzuki M, Hakim H, Sangsriratanakul N, Shoham D, Takehara K.
    Journal: J Vet Med Sci; 2017 Jun 16; 79(6):1019-1023. PubMed ID: 28496013.
    Abstract:
    An alkaline agent, namely food additive grade calcium hydroxide (FdCa(OH)2) in solution at 0.17%, was evaluated for its bactericidal efficacies in chiller water with sodium hypochlorite (NaOCl) at a concentration of 200 ppm total residual chlorine. Without organic material presence, NaOCl could inactivate Salmonella Infantis and Escherichia coli within 5 sec, but in the presence of fetal bovine serum (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 ppm and 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 or E. coli on chicken meats. It was confirmed and elucidated that FdCa(OH)2 has a synergistic effect together with NaOCl for inactivating microorganisms.
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