Journal of the Korean Society of Food Science and Nutrition (한국식품영양과학회지)

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Biological and Functional Characteristics of Lactic Acid Bacteria in Different Kimchi

김치 종류에 따른 유산균의 생물학적 및 기능적 특성

  • Ko, Kang Hee (Dept. of Food Engineering, Mokpo National University) ;
  • Liu, Wenli (Dept. of Food Engineering, Mokpo National University) ;
  • Lee, Hyun Hee (Dept. of Food Engineering, Mokpo National University) ;
  • Yin, Jie (Dept. of Food Engineering, Mokpo National University) ;
  • Kim, In Cheol (Dept. of Food Engineering, Mokpo National University)
  • 고강희 (목포대학교 식품공학과) ;
  • 유문려 (목포대학교 식품공학과) ;
  • 이현희 (목포대학교 식품공학과) ;
  • 은걸 (목포대학교 식품공학과) ;
  • 김인철 (목포대학교 식품공학과)
  • Received : 2012.09.14
  • Accepted : 2012.12.27
  • Published : 2013.01.31
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Abstract

Biological and functional characteristics of lactic acid bacteria (LAB) were investigated in mustard stem/leaf kimchi (MK), cabbage kimchi (CK), young radish kimchi (YRK), and cubed radish kimchi (CRK). LAB of young radish kimchi were mainly composed of bacilli in contrast to the other kimchi. 89.2% LAB isolated from all kimchi harbored plasmids. However, LAB had an average of $4.1{\pm}0.5$ plasmid bands in YRK, more than MK, CK, and CRK. Exopolysaccharides were produced by 10.9~11.1% of LAB, and were especially by LAB isolated from radish kimchi. A significant percentage of LAB (69.5%) had antibacterial activity against one sensitive strain or more. LAB from CK, YRK and CRK had antimicrobial activities against Bacillus sp., Listeria monocytogenes, and Salmonella Typhimurium, while the LAB from MK had activities against Vibrio parahaemolyticus higher than those from the other kimchi. In YRK and CRK, acid-tolerant LAB were twice as prevalent as those in MK and CK. Bile-tolerant LAB isolated from CRK were more prevalent than other kimchi. When $10^8$ CFU of LAB were added to Caco-2 cells, 12.1% of LAB isolated from all kimchi showed similar adherent activity to Lactobacillus rhamnosus GG. LAB of MK particularly adhered to Caco-2 cells, 2.0~4.1 fold higher than LAB in the other kimchi. From these results, biological and functional characteristics of LAB varied according to the type of kimchi and LAB existing in kimchi were limited to their respective species.

갓김치, 배추김치, 열무김치, 깍두기로부터 348종의 유산균을 분리하여 각 김치 종류에 따른 유산균의 특징을 확인하였다. 열무김치의 유산균은 다른 3종의 김치에 비해 간균+단간균:구균의 비가 5.6:1로 구균의 함량이 적었다. Leuconostoc 속으로 추정되는 구균의 함량은 4종의 김치가 모두 유사하였으나 Lactobacillus 속으로 추정되는 간균과 단간균의 함량은 깍두기에서 60.7%로 높게 나타났다. 다른 김치에 비해 배추김치 유래 유산균 중 18.7%가 plasmid가 없었으나 plasmid를 지닌 유산균 중에는 열무김치 유래 유산균에 평균 $4.1{\pm}0.5$개의 plasmid bands가 나타났다. 세포 외 다당(EPS)을 5 mg/mL 이상 생산하는 유산균은 무를 주재료로 한 깍두기와 열무김치에 각각 11.1%, 10.9%로 갓김치와 배추김치보다 많았지만 배추김치 유래 유산균이 $8.4{\pm}2.0mg/mL$의 EPS를 생산해 다른 김치 유래 유산균들보다 1 mg이상 높았다. 갓김치에는 V. parahaemolyticus에 대한 항균력을 지닌 유산균이 많은 반면 열무김치, 배추김치, 깍두기에서 Bacillus 속, L. monocytogenes, Salmonella Typhimurium에 대해 항균력을 지닌 유산균이 갓김치보다 2배 이상으로 나타났다. 열무김치와 깍두기 유래 유산균 중 43.3%, 45.5%가 내산성을 지녔으며, 특히 깍두기의 유산균 중 36.3%가 내담즙성을 나타내 다른 김치보다 많았다. Caco-2 세포에 대한 장내부착능을 지닌 유산균은 18.6%의 비율로 갓김치에 가장 많았다. 이러한 결과에서 볼 때, 김치에 함유된 유산균은 종이 한정적임에도 불구하고 김치 종류에 따라 각 김치에 함유된 유산균의 생물학적 특징에 차이가 있었으며, 특히 내산성, 내담즙성, 장내부착능을 지닌 유산균이 김치에 따라 차이가 나타남으로써 본 연구의 결과가 프로바이오틱 기능성을 지닌 유산균을 선별하는데 유용한 자료가 될 것으로 기대된다.

Keywords

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