The in vitro effects of trisodium phosphate and cetylpyridinium chloride on E. coli O157:H7 and L. monocytogenes were investigated. The trisodium phosphate and cetylpyridinium chloride was bactericidal toward E. coli O157:H7 and L. monocytogenes. The killing effects of the 1 × 10^(-2) M trisodium phosphate on E. coli O157:H7 and L. monocytogenes were 30-40%, 40-50%, respectively. The killing effects of the 5 × 10^(-7) M cetylpyridinium chloride on E. coli 0157:H7 and L. monocytogenes were 90-95%, 95-99%, respectively. The killing effects of the trisodium phosphate was 105 times that of the cetylpyridinium chloride. Factors effecting the bactericidal action of trisodium phosphate and cetylpyridinium chloride were investigated and the action depended on temperature and pH.

• 강길진(식품의약품안전청, 광주지방청) | Kil-Jin Kang