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Page No. : 27-31

ABSTRACT

The effectiveness of exposure of sodium hypochlorite (50 ppm/10 min), lactic acid (1.5%/5 min) and ultraviolet light (415.75 mJ/cm2/2 min) on growth kinetics of E. coli (ATCC 25922) and Salmonella Typhimurium (ATCC 14028) inoculated on chicken and stored for 7 days at refrigeration temperature (0-4ºC) was assessed at the intervals of 0th, 3rd, 5th and 7th day of storage. E. coli count of all the treatment groups showed a statistically significant (p<0.05) difference with increase in storage time. Salmonella Typhimurium count of all treatment groups showed a statistically significant (p<0.05) difference with increase in storage time except on day 5th and 7th for sodium hypochlorite and lactic acid groups. A non-significant difference was observed between sodium hypochlorite and ultraviolet light treatment groups considering E. coli and Salmonella Typhimurium count. The increasing trend of pH was observed during the storage period for all the treatment groups irrespective of inoculum used but a significantly lower pH value was observed for lactic acid group. Lactic acid was found to be effective during the storage period, while sodium hypochlorite and ultraviolet light treatments were compatible with each other in reducing E. coli and Salmonella Typhimurium from surface of chicken samples.

Keywords: Chicken, decontamination; E. coli, S. Typhimurium, lactic acid, sodium hypochlorite, UV-C