Abstract
Process biofilms of Bacillus licheniformis present worldwide problem to the dairy industry because of their relevance to food spoilage and quality issues. In this study, metabolites of Lactobacillus plantarum were found to effectively inhibit biofilms formed by B. licheniformis. The biofilm formation was delayed by 10 h by the addition of L. plantarum cell free supernatant and controlling pH of the medium. Confocal laser scanning microscope images showed that L. plantarum metabolites decreased the number of B. licheniformis cells adhered to stainless steel and glass surfaces. Gel filtration chromatography results showed that B. licheniformis utilized the peptides in the growth medium (tryptic soy broth) with the molecular weights ranging from 613 to 1486 Da, and produced plentiful small peptides with the molecular weights ranging from 181 to 613 Da. Moreover, 3–10 kDa components of L. plantarum ultra-filtrates were proved to significantly inhibit biofilm formation by B. licheniformis. Thus, the metabolites produced by L. plantarum provide a novel approach for the prevention of B. licheniformis biofilms in the dairy industry.
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