Microbiology and Biotechnology Letters (한국미생물·생명공학회지)

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Characteristics of Antimicrobial Organic Acids Produced by lactobacillus pentosus K34 isolated from Small Intestines of Korean Native Chickens

한국토종닭 소장에서 분리한 Lactobacillus pentosus K34가 생산하는 항균성 유기산의 특성

  • Published : 2002.09.01
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Abstract

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.

한국 토종닭의 작은창자로부터 살모넬라와 포도상구균치 성장 저해력이 우수한 7주의 유산균을 분리하였다. 분리된 7주의 배양액을 단백질 분해효소로 처리한 결과 저해활성의 변화가 없었다. Lactic acid 1.8 %에 의하여서는 Salmonella gallinarum의 성장저해환이 9 mm 나타났는데 , 대부분의 분리 유산균 배양액은 산도가 1.08∼l.8 %인데도 불구하고 성장 저해환이 10∼ll mm로 나타난 것으로 보아 유산균 배양액내에는 lactic acid이외의 다른 물질이 있는 것으로 사료된다. GC-MSD를 이용하여 항균성이 우수한 L. pentosus K34 배양 액내의 생성된 유기산 metabolic profile을 조사한 결과 28종의 유기산이 검출되었으며, 그 중 천연항균물질인 phenyllactic acid가 lactic acid, acetic acid와 더불어 높은 농도로. 생산되었다. Phenyllactic acid는 acetic acid, formic acid, lactic acid와 저해활성을 비교하였을 때 우수한 항균활성을 보였으며 acetic acid, formic acid, lactic acid가 pH 5.0에서는 저해활성이 크게 감소함에 비하여 phenyllactic acid는 pH 5.0에서도 저해활성이 그대로 유지되었다. Phenyllactic acid는 살모넬라, 포도상 구균에 대한 항균능력이 특이적으로 강력하게 나타났으며 효모, 곰팡이에 대한 항균활성은 매우 낮았다.

Keywords

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