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Bacterial biofilms of foodborne pathogens pose the risk of secondary contamination in a food processing environment. Listeria monocytogenes is a Gram-positive, foodborne pathogen that contaminates various foods and environments. This bacterium can form biofilms on food-related surfaces. In this study, to inhibit biofilm formation by L. monocytogenes, we focused on suppressing the initial adhesion of the pathogen onto polystyrene dishes, which is the first step of biofilm formation. Screening of adhesion inhibitory materials using polystyrene dishes surfacetreated with food-related materials demonstrated high inhibitory effects of nisin and whey powder against L. monocytogenes adhesion. Moreover, surface treatment with nisin was able to delay biofilm formation of L. monocytogenes and the dish surface showed bactericidal activity. To improve the adhesion inhibitory effects of nisin, we combined nisin and a sucrose fatty acid ester, sucrose palmitate, for surface treatment, and this combination markedly improved the adhesion inhibitory effects. Thus, combined surface treatment with nisin and sucrose palmitate may be an effective method to prevent biofilm formation by L. monocytogenes in food processing environments. (Received Apr. 19, 2017 ; Accepted May 29, 2017)

Suppression of Initial Adhesion and Biofilm Formation of <i>Listeria monocytogenes</i> by Nisin and Sucrose Fatty Acid Ester