Antimicrobial activity of starch-degrading Lactobacillus strains isolated from boza

Abstract

The proved probiotic effects of boza consummation prompted the increasing interest in the microflora taking part in its fermentation. Boza is a rich source of probiotic lactic acid bacteria that are able to produce bacteriocins active against a number of pathogens. In the present study, three strains - Lactobacillus paracasei B41, Lactobacillus plantarum Bom 816, and Lactobacillus pentosus N3, isolated from boza and possessing significant amylolytic activity, were studied for their ability to repress the growth of common foodborne pathogens. All strains demonstrated antimicrobial activity against Escherichia coli, Klebsiella pneumoniae, Vibrio cholerae and Bacillus subtilis. The results indicated possible bacteriocin production and made the strains desirable starters with application in cereals processing. None of the tested lactobacilli inhibited the growth of Saccharomyces cerevisiae or Pichia strains, suggesting the existence of stable microbial community of yeasts and lactobacilli in boza starters.