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

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Fermentation Properties and Increased Health Functionality of Kimchi by Kimchi Lactic Acid Bacteria Starters

김치 유산균 Starter를 이용한 김치의 발효 특성 및 기능성 증진 효과

  • Bong, Yeon-Ju (Dept. of Food Science and Nutrition, Pusan National University) ;
  • Jeong, Ji-Kang (Dept. of Food Science and Nutrition, Pusan National University) ;
  • Park, Kun-Young (Dept. of Food Science and Nutrition, Pusan National University)
  • 봉연주 (부산대학교 식품영양학과) ;
  • 정지강 (부산대학교 식품영양학과) ;
  • 박건영 (부산대학교 식품영양학과)
  • Received : 2013.07.08
  • Accepted : 2013.09.04
  • Published : 2013.11.30
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Abstract

Fermentation characteristics and health functionalities of kimchi by inoculating kimchi lactic acid bacteria (LAB) starters were studied. We manufactured single LAB starter kimchi (Lactobacillus plantarum pnuK, Lactobacillus plantarum 3099K, Leuconostoc mesenteroides pnuK), mixed LAB starter kimchi (Lb. plantarum pnu/Leu. mesenteroides pnuK, Lb. plantarum 3099/Leu. mesenteroides pnuK) with inoculum size of $10^6$ CFU/g, as well as naturally fermented kimchi (NK), and fermented them for 6 days at $15^{\circ}C$. The pH and acidity of the early phase of fermentation were not different, but kimchi with the starters showed rapid changes in the pH and acidity from 2 days of fermentation. As the fermentation progressed, the level of total aerobic bacteria and Lactobacillus sp. increased similarly with or without Lb. plantarum (LP) inoculation. However, the level of Leuconostoc sp. was high in kimchi inoculated with Leuconostoc sp. starter. In the sensory evaluation test, kimchi with starters received higher overall acceptability scores than those of NK; mixed starter added kimchi earned the highest score. In DPPH and hydroxyl radical scavenging activity, kimchi with the starters exhibited higher activity than that of NK. In the MTT assay of HCT-116 and HT-29 human colon cancer cells, NK showed inhibition rates of 63.4 and 51.9%, but LPpnuK achieved 77.1 and 68.8%, respectively. This study showed that inoculating starters in kimchi increased in vitro antioxidant and anticancer activities, and single starter (LP) added kimchi revealed higher functionality than the kimchi with mixed starter. Kimchis with the starters effectively up-regulated the gene expressions of the pro-apoptotic gene of Bax, but down-regulated Bcl-2. They promoted expressions of p53 and p21, and suppressed expressions of inflammation-related genes, iNOS and COX-2, compared with NK. Taken together, it is expected that using starters may help manufacture kimchi with improved sensory quality and health functionality.

본 연구에서는 김치 유산균 starter의 사용이 김치의 품질특성과 건강기능성에 미치는 영향을 확인하고자 single starter 김치(Lb. plantarum pnuK, Lb. plantarum 3099K, Leu. mesenteroides pnuK), mixed starter 김치(Lb. plantarum pnu/Leu. mesenteroides pnuK, Lb. plantarum 3099/Leu. mesenteroides pnuK), 자연 발효 김치(NK)를 제조하여 $15^{\circ}C$에서 6일간 발효하며 실험하였다. pH 및 산도는 발효 초기에는 차이가 없었으나 발효 2일부터 starter 접종 김치에서 빠른 변화를 보였다. 총호기성 세균과 Lactobacillus sp.는 발효가 진행될수록 비슷하게 증가하였으나 Leuconostoc sp.는 Leu. mesenteroides를 starter로 접종한 김치에서 높게 나타났다. 관능검사 결과 starter를 첨가한 김치에서 관능적 만족도가 높게 나타났으며, 혼합 starter 김치에서 만족도가 더 높았다. DPPH 및 hydroxyl radical 소거능 측정 결과, starter를 첨가한 김치에서 높은 항산화 효과를 보였다. MTT assay 결과, HCT-116 및 HT-29 세포에서 NK는 각각 63.4, 51.9%를 나타내었고 Lb. plantarum pnuK는 각각 77.1, 68.8%의 암세포 성장 저해율을 보였다. 따라서 starter 첨가 시 항산화 및 항암효과가 증가되며, 단일 starter 김치가 혼합 starter 김치보다 높은 기능성을 가지는 것으로 나타났다. 그중 새로 분리 동정된 Lb. plantarum pnu를 이용한 김치에서의 높은 대장암 세포 성장억제 효과를 확인하였다. Apoptosis 유도에 관련된 Bcl-2 및 Bax, 종양 억제에 관련된 p53 및 p21, 염증에 관련된 iNOS 및 COX-2 유전자 발현은 starter 첨가 김치에서 자연발효 김치보다 모두 apoptosis 유도 작용과 염증 및 종양을 억제하는 효과가 높게 나타났다. 가장 높은 효과를 보인 것은 Lb. plantarum pnuK이었으며 단일 starter 김치에서 혼합 starter 김치보다 효과가 높았다. 이상의 결과로 starter를 이용해 관능적 품질이 우수하고 기능성이 증진된 김치를 제조할 수 있을 것으로 기대된다.

Keywords

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