Investigation of Antagonistic Effect of Probiotic Food Supplement against Different Strains of Bacteria

Abstract

Objective: Probiotics are an important part of the microbiota associated with many diseases. The production of food and food supplements containing probiotic products has increased considerably in recent years, due to their protective effect on health and antagonistic effect against some pathogenic microorganisms. However, it is unknown whether the content of these products has the expected effect. In this study was aimed to investigate the antagonistic effect of Probiotics & Prebiotics® commercial product. Material-Method: The probiotic food supplement was obtained from Aym-Net®. Antagonistic effect of the product on 10 different test bacteria was investigated by the agar spot assay method. Also lyophilized probiotics were cultured in MRS broth medium and centrifuged at 3500 rpm for 25 minutes in order to obtain metabolites that the probiotic microorganisms provide their effectiveness. Effect of probiotic supernatant on test bacteria were determined to disk diffusion test by CLSI. Each test bacteria combined with the probiotic product incubated at 37 0 C for 24 hours to determine the bacterial inhibition rate of product which analyzed using the Mann Whitney U test. Results: Probiotic product inhibited growth of L. monocytogenes by (86 %), Y. pseudotuberculosis (82%), S. aureus (76%), E. coli (74%), S. typhimurium (73%), P. aeruginosa (69%) and S. epidermidis (67%) respectively. The lowest antagonistic effect was detected against E. faecalis 44%. While probiotic product provided significant growth inhibition on 8 strains (p<0.05), there were not statistically significant growth inhibition for P. vulgaris and E. cloacae (p>0.05). Conclusion: It was concluded that antagonistic effect of probiotic food supplement on test bacteria. Therefore it may be beneficial to use in bacterial infections.