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An interesting property for many probiotic strains is to exhibit antimicrobial activity against pathogenic microorganisms. Therefore, the antimicrobial activity of the potentially probiotic strain  Lactobacillus acidophilus  L12 against  Escherichia coli, Staphylococcus aureus  and  Salmonella  sp. was examined  in vitro  through co-culturing of  Lactobacillus acidophilus  L12 with each of the pathogenic strains for 72 h. When cultured individually, all strains reached a final population always exceeding 10 12  cfu/mL. When co-cultured with each of the pathogenic strains  Lactobacillus acidophilus  L12 population always exceeded 10 12  cfu/mL, while the bacterial population of the pathogenic strains was reduced in a strain-specific manner.  Lactobacillus acidophilus  L12 demonstrated the highest inhibitory activity against the two  Staphylococcus aureus  strains, followed by the two  E. coli  strains, and the two  Salmonella  sp. strains tested. The kinetics of the co-culturing process of  Lactobacillus acidophilus  L12 with each of the test pathogenic strains was modelled using the logistic curve model. The obtained results show the strong antagonistic activity of the potentially probiotic strain  Lactobacillus acidophilus  L12, thus making it a promising candidate for inclusion in the composition of probiotic preparations and functional probiotic foods.

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In vitro examination of the antimicrobial activity of a potentially probiotic Lactobacillus acidophilus strain against Escherichia coli, Staphylococcus aureus and Salmonella sp.