김치 분리 유산균의 치즈 곰팡이 항진균 활성
Antifungal activity against cheese fungi by lactic acid bacteria isolated from kimchi
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초록
본 연구는 치즈 숙성 중 오염원인 곰팡이균 제거기술 개발의 일환으로 수행하였다. 치즈 및 치즈 숙성실에서 자생하는 곰팡이를 분리하고, 지역별 김치로부터 유산균을 분리하여 치즈 곰팡이에 대한 항진균 활성을 측정한 결과는 다음과 같다. 치즈와 치즈 숙성실에 분리된 곰팡이는 총 8종으로 Penicillium과 Cladosporium으로 동정되었다. 지역별 김치로부터 분리된 유산균은 총 44종이고 이 중 항진균 활성을 보인 유산균 22종을 동정한 결과 Lactobacillus와 Pediococcus로 확인되었다. 동정된 김치 분리 유산균 22종 중 항진균 활성도가 높은 유산균 6종(L. sakei subsp. ALJ011, L. sakei subsp. ALI033, L. sakei subsp. ALGy039, P. pentosaceus ALJ015, P. pentosaceus ALJ024, P. pentosaceus ALJ026)을 선발하여, 치즈 곰팡이균 8종에 대하여 항진균 활성을 측정한 결과 전주지역 김치에서 분리한 유산균인 P. pentosaceus ALJ015, P. pentosaceus ALJ024 과 임실지역 김치에서 분리한 유산균인 L. sakei subsp. ALI033 균주가 치즈 곰팡이에 대한 항진균 활성이 높게 나타났다. 치즈 곰팡이에 대한 유산균 배양액의 최소저해농도를 측정해 본 결과, 생육저지환으로 알아본 항균활성 실험과 동일하게 분리 곰팡이균 8종에 대하여 L. sakei subsp. ALI033 유산균의 항진균 활성이 가장 크게 나타났다.
Abstract
The antifungal activity against cheese fungi by lactic acid bacteria isolated from kimchi was investigated. Eight fungi were isolated from cheese in the cheese ripening room. Two of them were identified as Penicillium and Cladosporium via ITS-5.8S rDNA analysis. Twenty-two species of lactic acid bacteria with antifungal activity were isolated from kimchi. Two of them were identified as Lactobacillus and Pediococcus via 16S rRNA sequence analysis. Of the 22 lactic acid bacteria species, six were selected (L. sakei subsp. ALJ011, L. sakei subsp. ALI033, L. sakei subsp. ALGy039, P. pentosaceus ALJ015, P. pentosaceus ALJ024 and P. pentosaceus ALJ026) due to their higher activity against the eight fungi isolated from cheese in the cheese ripening room; and among the six species, the P. pentosaceus ALJ015 and P. pentosaceus ALJ024 isolates from the Jeonju area kimchi and the L. sakei subsp. ALI033 isolate from the Iimsil area kimchi had higher antifungal activity than the other lactic acid bacteria. The minimum inhibitory concentration (MIC) of L. sakei subsp. ALI033 against the eight fungi isolated from cheese in the cheese ripening room was 62.5 ㎍/mL.
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