Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
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Combined Effects of Bacteriocin of Enterococcus faecalis MJ-213 and Organic Acid on Listeria monocytogenes Inactivation

Listeria monocytogenes에 대한 Enterococcus faecalis MJ-213이 생산한 박테리오신과 유기산 혼합 처리의 항균활성

  • Lim, Sung-Mee (Department of Food Science and Technology, Tongmyong University)
  • 임성미 (동명대학교 식품공학과)
  • Published : 2009.03.31
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Abstract

In this study, the effect of combining oragnic acid and bacteriocin of E. faecalis MJ-213 isolated from Meju against L. monocytogenes KCTC 3569 growth in BHI broth and ground pork was investigated. In combination, the effects of 256 BU/ml bacteriocin and 1.5% acetic acid, citric acid or lactic acid were synergistic and effective than those compounds alone in controlling the viable cell counts of L. moncytogenes. The addition of increasing concentrations of the bacteriocin or organic acids led to a marked decrease in the number of L. monocytogenes. The combining treatment of the bacteriocin (256 BU/ml) and organic acid (1.5%) in ground pork inoculated with L. monocytogenes (5 log CFU/ml) resulted in 1 to 2 log CFU/ml reduction of cell counts during storage at $4^{\circ}C$ for 60 h. Also, the bacteriocin of E. faecalis MJ-213 was relatively stable at $100^{\circ}C$ for 20 min.

메주에서 분리된 Enterococcus faecalis MJ-213이 생산한 박테리오신 용액과 유기산의 혼합 처리에 의한 Listeria monocytogenes KCTC 3569의 항균효과를 조사하였다. 박테리오신 256 BU/ml 단독 처리에 의한 L. monocytogenes KCTC 3569의 감소율은 약 32% 정도였으나, 박테리오신과 acetic acid 2.0%의 혼합 처리에 의해 약 80% 감소되었고, 혼합한 유기산 중에서 citric acid와 lactic acid 보다 acetic acid에 의해 더 높게 나타났다. 한편, acetic acid 1.5%와 박테리오신 128 BU/ml에 의해선 약 30% 정도 감소된 반면, 512 BU/ml와의 혼합 처리에 의해선 약 78% 정도 감소되었다. 또한 유기산과 박테리오신의 혼합처리시 L. monocytogenes KCTC 3569의 초기 균수가 3 log CFU/ml인 경우 7 log CFU/ml일 때보다 감소율은 무려 2배 이상 증가되어 초기 균수가 적을수록 항균효과는 더 크게 나타났다. L. monocytogenes KCTC 3569의 증식과정 중 유도기에 acetic acid와 박테리오신을 혼합 처리한 경우 박테리오신 단독처리 때 보다 흡광도는 약 절반 정도에만 머물렀다. 시판 돈육 내에 존재하는 L. monocytogenes KCTC 3569의 균수는 박테리오신 256 BU/ml 단독 처리한 경우 $4^{\circ}C$에서 60시간 동안 약 1 log CFU/ml 감소되었으나, acetic acid와 혼합 처리에 의해선 약 2 log CFU/ml 감소되었다. 한편 가열 처리 전후 박테리오신 용액의 항균 활성에는 거의 변화가 없었다.

Keywords

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