Antibacterial effects of probiotics isolated from yoghurts against some common bacterial pathogens

摘要

According to the de?nition of probiotics by the Food and Agriculture Organization of the United Nations/World Health Organization, “probiotics are live microorganisms, which when administered in adequate amounts confer a health bene?t on the host”. Microorganisms that are probiotics in humans include?Enterococci,?Bi?dobacteria?and lactic acid bacteria, such as?Lactobacilli,?Lactococci?and?Streptococci. This research was conducted to determine the presence of antibacterial effects among the probiotics isolated from different bioyoghurts against some common bacterial pathogens.?Lactobacillus?sp., Streptococcus?sp.?and?Bifidobacterium?sp. from yoghurts containing probiotics were isolated and examined for their antibacterial effects against?Staphylococcus aureus, Escherichia coli, Salmonella typhi,?and?Pseudomonas aeruginosa. The modified agar overlay method was used for determination of the presence of antibacterial effects among the isolated probiotics. Results showed the presence of antibacterial effects among the probiotics that were isolated from bioyoghurts. The spectrum of their antibacterial effects varied against the selected pathogen. Antibacterial effects are one of the most important selection criteria for probiotics, and the verified antibacterial activity of the probiotics supports the development of these functional foods as a key to the improvement of health in the consuming public.