engleski

Ability of Chosen Lactic Acid Bacteria to Produce Antibacterial Substances

Six strains of lactic acid bacteria isolated from silage, fermented milk and vegetables, were examined for antagonistic activities against a entheropathogenic microorganisms and lactic acid bacteria. The two screening methods used were the agar spot test and the disc assay method Cell-free supernatants of lactic acid bacteria inhibit the growth of Staphylococcus aureus 3048, Staphylococcus aureus K-144, Salmonella mumum, Escherichia coli, Bacillus cereus and Bacillus subtilis. However, concentrated and neutralized supernatants from four of six strains (Lactobacillus acidophilus, Lactobacillus plantarum L4, Lactobacillus plantarum Z88, Enterococcus faecium) showed antibacterial activity against Gram-negative and Gram-positive target strains, included some strains of lactic acid bacteria. This result confirm activity of antibacterial substances other than lactic acid. Plasmids have been also detected in this four lactic acid bacteria which exhibit higher antibacterial activity.

lactic acid bacteria; antibacterial substances

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