The Susceptibility of Bioluminescent Salmonella typhimurium Contaminating Chicken Carcasses to Cetylpyridinium Chloride and Nisin

Abstract

The effect of cetylpyridinium chloride (CPC) and nisin on the inhibition of viable bioluminescent Salmonella typhimurium contaminating chicken carcasses were conducted. The chicken drumstick sections (5 by 5 cm²), inoculated with bioluminescent S. typhimurium S36, were treated with 0, 0.1, 0.3 and 0.5 % (w/v) CPC for 30 sec and further treated with 0, 20, 60 and 100 μg/ml nisin for 30 min. It was found that 0.5% (w/v) CPC and 100μg/ml nisin decreased (P<0.05) the numbers of Salmonella lux. Additionally, inoculated chicken drumstick sections were treated with 0.5% (w/v) CPC for 15, 30, 60 and 120 sec and then treated with 100 μg/ml nisin for 15, 30, 45 and 60 min. The use of 0.5% (w/v) CPC for 120 sec and 100 μg/ml nisin for 30 min increased (P<0.05) the loss of cell viability with minimal effect on the appearance of chicken carcass. These results also demonstrated the synergistic activity of CPC and nisin against S. typhimurium and can be expected to enhance the safety of chicken carcasses and other chicken products.