Screening ofBifidobacterium strains for bacteriocin production

Summary Thirteen strains of bifidobacteria (Bifidobacterium) were examined for bacteriocin production. One strain among these produced bacteriocin which is active against lactic streptococci strains and against other species ofBifidobacterium, Clostridium andLactobacillus, but not against Gram-negative bacteria such asPseudomonas, Klebsiella, Serratia andEscherichia coli.Bacteriocin activity was inhibited by proteolytic enzymes, but not by heating 15 min or30 min at 100°C, and it was resistant for 15 min at 121°C and active at pH between 2 to 10.