Journal of Food Hygiene and Safety (한국식품위생안전성학회지)

The Korean Society of Food Hygiene and Safety (한국식품위생안전성학회)
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Antilisterial Activity of Bacteriocin Produced by Enterococcus faecium MJ5-14

Enterococcus faecium MJ5-14가 생산한 박테리오신의 항리스테리아 활성

  • Lim, Sung-Mee (Department of Hotel Culinary Arts, Tongmyong College) ;
  • Lee, Jong-Gab (Department of Hotel Culinary Arts, Tongmyong College) ;
  • Park, Mi-Yeon (Deparment of Food Science and Technology, Pukyong National University) ;
  • Chang, Dong-Suck (Deparment of Food Science and Technology, Pukyong National University)
  • Published : 2004.09.01
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Abstract

Enterococcus faecium MJ5-14 isolated from Meju produced a bacteriocin, which was antagonistic towards Listeria monocytogenes. Bacteriocin activity reached a maximum (640 BU/mL) after incubation for 12 hr, the early stationary phase, then dropped after the late stationary phase. Bacterocin of E. faecium MJ5-14 was extremely active against a wide range of Listeria species, including L. monocytogenes with sensitives up to about 640 BU/mL. In case of mixed culture with 105 CFU/mL L. monocytogenes and 105 CFU/mL E. faecium MJ5-14, the inhibitory effect against L. monocytogenes at $37^{\circ}C$ was higher than at $25^{\circ}C$. The mode of action was identified as bactericidal, because the addition of 100 BU/mL this bacteriocin to cell suspensions of L. monocytogenes KCTC 3569, led to a marked decrease in the number of viable cells. Further, when held in contact with bacteriocin of E. faecium MJ15-14 for 12 hr, L. monocytogenes KCTC 3569 displayed the disruption of the cells and an important efflux of the intracellular material.

우리나라 고유의 전통발효 식품인 메주로부터 항리스테리아 활성을 나타내는 유산균을 분리한 후 동정한 결과 E. faecium MJ5-14로 명명되었으며, 이들의 박테리오신은 MRS broth 중에 $37^{\circ}C$에서 12-18시간 배양하는 동안 최대의 활성을 나타내었다. L. monocytogenes KCTC 3569와 KCTC 3710 및 L. ivanovii subsp. ivanovii에 대한 박테리오신의 활성은 640 BU/mL이었고, L. innocua ATCC 33090, L. ivanovii ATCC 19119, L. grayi KCTC 3581 및 L. seeliger KCTC 3591에 대한 활성은 1280 BU/mL으로 나타났다. L. monovytogenes KCTC 3569와 E. faecium MJ5-14을 혼합 배양한 경우 L. monocytogenes의 감소 효과는 $25^{\circ}C$이하 보다는 E. faecium MJ5-14의 박테리오신 생산 최적 온도인 $37^{\circ}C$에서 더 높게 나타났으며, E. faecium MJ15-14의 박테리오신 항균 효과는 L. monocytogenes KCTC 3569의 초기 균수와 첨가한 박테리오신의 양에 따라 좌우하는 L. monocytogenes의 초기 균수가 적고, 박테리오신의 첨가량이 많을수록 항균효과가 높아짐을 확인하였다. 또한 박테리오신 70 BU/mL 첨가에 의한 항균 효과는 균 증식이 활발한 대수증식기 중반 이후 보다는 유도기 내지는 대수증식기 초반부에 더 크게 나타났다. 한편, 박테리오신 25 BU/mL을 첨가에 의해서 L. monocytogenes KCTC 3569 새포벽의 일부가 얇아지고, 50 BU/mL 이상의 농도에 의해선 세포막이 파괴되면서 세포 내용물의 유출 현상이 관찰되었다.

Keywords

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