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Seven lactic acid bacteria showing highly inhibitory activities against Salmonella gallinarum, Staphylococcus aureus, and Escherichia coli were isolated from Korean native chickens. The inhibitory activities were insensitive to various pretenses indicating that the inhibitory substance is not protei...

Seven lactic acid bacteria showing highly inhibitory activities against Salmonella gallinarum, Staphylococcus aureus, and Escherichia coli were isolated from Korean native chickens. The inhibitory activities were insensitive to various pretenses indicating that the inhibitory substance is not proteinaceous. The culture broths seem to contain other inhibitory substances in addition to lactic acid. The metabolic profile of organic acids produced by Lactobacillus pentosus K34 was investigated by GC-MSD and 28 different organic acids were detected in the culture broth. Compared with the prominent lactic acid, acetic acid, formic acid, the thirdly most abundant phenyllactic acid showed high inhibitory activity against S. gallinarum. After pHs of the acids were adjusted to S, the inhibitory activities of lactic acid, acetic acid, formic acid against S. gallinarum were greatly reduced while the inhibitory activity of phenyllactic acid was unchanged. The inhibitory activity of the phenyllactic acid was specifically high against S. gallinarum and S. aureus but very low against yeast and mold.

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