Etude de l’effet antimicrobien des souches de leuconostoc contre des Bactéries lactiques et pathogénes

Abstract

Our work focused on several genera of lactic acid bacteria, three pathogenic bacteria and a strain of Candida albicans. These lactic acid bacteria have been tested against each other and against pathogenic strains Leuconostoc inhibits each other in 85% of cases and inhibited pathogenic bacteria in 91% of cases. Candidaalbicans was not inhibited by any strain of Leuconostoc. Several inhibitions were observed on MRS medium, but none on Mayeux medium. that observed by The sensitivity of pathogenic strains to antibiotics is of the same order as inhibitions due to lactic acid bacteria. Leuconostocs have a greater inhibitory power on pathogenic bacteria compared to lactococcus and enterococci. These last two genera showed an inhibitory effect only against E.coli and Staphylococcus aureu The well diffusion method made it possible to observe inhibitions against lactococci and pathogenic bacteria caused by leuconostocs and enterococci. The leuconostocs, enterococci and lactococci tested against each other did not show any inhibitory effect. The results of the inhibitory effects existing between lactic acid bacteria make it possible to consider the combination of leuconostoc and lactococcus strains for the development of mixed ferments.