Abstract
Twenty-seven propionic acid bacteria (PAB) strains were studied for their ability to pro- duce metabolites, which stimulated the growth of six Bifidobacteriumstrains. In addition, the 27 in- vestigated PAB strains were examined for their influence on the growth of four Gram(-) strains belonging to species Escherichia coliand Yersinia enterocolitica, their abilities to survive at pH 2.0, 2.5, 3.0 and in the presence of 4% bile salts as well as their sensitivity against 12 selected antibiotics. All PAB strains stimulated growth of from 3 to 6 of the examined Bifidobacteriumstrains and simul- taneously produced antibacterial metabolites against Gram(-) rods. Fifteen PAB strains inhibited growth of the particular Bifidobacteriumstrains. Five PAB strains were resistant to acidity surviving for 2 h in pH 2.5 at population level 10 2 -10 6 cfu.mL -1 and 3 strains were resistant to bile salts. Only one PAB strain survived in both the acidic and the bile salt environments. All PAB strains were sensi- tive to a majority of the antibiotics used in the investigations. Bifidobacterium / Propionibacterium / Gram(-) rod / stimulation / inhibition
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