Selection of Lactobacillus plantarum TN627 as a new probiotic candidate based on in vitro functional properties

Nine lactobacilli previously selected for high antagonism against food borne bacterial pathogens were identified via 16S rRNA gene sequencing and screened for probiotic potential for use in poultry production. The lactobacilli were subjected to a subtractive in vitro analysis system using a certified probiotic as reference. This allowed for selection of a milk-derived Lactobacillus plantarum strain, termed TN627. This organic acid-producing bacterium was free of harmful enzymatic activity and sensitive to several antibiotics. It also showed good growth at pH 4 and in the presence of bile. L. plantarum TN627 also exhibited high efficacy of adhesion to chicken enterocytes, which correlated with detecting genes encoding the mucusbinding, adhesion-promoting proteins (Mub and MapA) and the adhesion-like factor EF-Tu, commonly involved in adherence of lactobacilli to mucosal surfaces. Taken together, our findings suggest that TN627 is a promising probiotic candidate with high potential for application as a supplement in the animal feed industry.