η-Poly-L-lysine and nisin A act synergistically against Gram-positive food-borne pathogens Bacillus cereus and Listeria monocytogenes


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Abstract

AimsTo test η-poly-L-lysine and nisin A for possible synergistic activity against selected food-borne pathogens and food spoilage organisms.Methods and ResultsSynergistic activity was observed against Gram-positive Listeria monocytogenes and Bacillus cereus cells and spores of B. cereus in 96 well plate assays. However, nisin A had no effect alone or in combination with η-poly-L-lysine against Gram-negative Escherichia coli cells. In addition, when tested against yeast Zygosaccharomyces bailii, nisin A and partially inhibitory concentrations of η-poly-L-lysine antagonized each other.ConclusionsNisin A and η-poly-L-lysine showed synergistic activity against B. cereus and L. monocytogenes.Significance and Impact of the StudyThe application of nisin A and η-poly-L-lysine is a promising all-natural method of controlling Gram-positive food-borne pathogens, spores and spoilage organisms.

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