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

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Characterization of Probiotic and Functional Properties of Lactobacillus curvatus ML17, a Mukeunji Starter

묵은지 스타터 Lactobacillus curvatus ML17의 생균제적 특성 및 기능성 조사

  • Kim, Hyo Ju (Food Research Institute, Jeonnam Bioindustry Foundation) ;
  • Sung, Hea Mi (Food Research Institute, Jeonnam Bioindustry Foundation) ;
  • Shin, Hyun-Kyung (Food Research Institute, Jeonnam Bioindustry Foundation) ;
  • Kim, Ki Myong (Dept. of Food and Nutrition, Honam University) ;
  • Yang, Eun Ju (Food Research Institute, Jeonnam Bioindustry Foundation)
  • 김효주 ((재)전남생물산업진흥원 식품산업연구원) ;
  • 성혜미 ((재)전남생물산업진흥원 식품산업연구원) ;
  • 신현경 ((재)전남생물산업진흥원 식품산업연구원) ;
  • 김기명 (호남대학교 식품영양학과) ;
  • 양은주 ((재)전남생물산업진흥원 식품산업연구원)
  • Received : 2014.03.20
  • Accepted : 2014.06.11
  • Published : 2014.07.31
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Abstract

This study investigated the probiotic and functional characteristics of Mukeunji starter, Lactobacillus curvatus ML17, isolated from Mukeunji. Lb. curvatus ML17 was confirmed as a safe microorganism due to its non-hemolytic activity and non-production of harmful ${\beta}$-glucuronidase and ${\beta}$-glucosidase. Tolerance to artificial gastric and bile juice of Lb. curvatus ML17 was investigated. After incubation in artificial gastric and bile juice, the number of surviving cells was $1.38{\times}10^8$ CFU/mL. According to the results of adhesion assay, this strain also exhibited good adhesion to Caco-2 cells. Lb. curvatus ML17 showed good antimicrobial activity against food borne pathogens, especially Micrococcus luteus, Bacillus cereus, Salmonella enterica subsp. enterica, and Pseudomonas aeruginosa. Cell-free extract of Lb. curvatus ML17 exhibited high levels of DPPH scavenging capacity and inhibitory effects on growth of AGS human gastric adenocarcinoma cells and HT-29 human colon carcinoma cells. These results suggest that Lb. curvatus ML17 has potential for application in functional foods.

묵은지 스타터로 개발된 Lb. curvatus ML17의 생균제적 특성 및 기능성 조사를 통하여 기능성 소재로서의 개발 가능성을 검토하였다. Lb. curvatus ML17은 용혈현상을 일으키지 않았으며 ${\beta}$-glucosidase와 ${\beta}$-glucuronidase의 발암효소 활성이 없는 것으로 나타나 균주에 대한 안전성을 확인하였다. 장내 생존성 확인 실험에서는 인공위액에서 2시간 처리한 다음 인공담즙에서 24시간 처리한 결과 초기 균수 대비 12.30%의 생존율을 나타내었다. Caco-2 cell에 대한 부착율은 초기 접종균수가 많을수록 높게 나타났으며, $5.66{\times}10^9$ CFU/mL로 처리 시 17.31%의 부착율을 나타냈는데 20.78%의 부착율을 나타낸 양성 대조군 Lb. rhamnosus GG에 근접하게 높은 부착율을 나타내어 장내환경에서 바람직한 작용을 할 수 있음을 보여주었다. 유해균주에 대한 생육저해 활성 측정에서는 Micrococcus luteus, Bacillus cereus, Salmonella enterica subsp. enterica, Pseudomonas aeruginosa에 대하여 우수한 항균 활성을 나타내었다. DPPH radical 소거능을 이용한 항산화 활성 측정 결과 72.88%로 양성 대조군인 0.1 mg/mL ascorbic acid보다 높은 free radical 소거능을 나타내었다. AGS 위암세포 및 HT-29 결장암세포에 대한 성장 억제 효과에서는 Lb. curvatus ML17의 배양 상등액 $80{\mu}L/mL$ 처리 시 각각 82.91% 및 79.35%의 암세포 성장 억제 효과를 나타내었다. 이와 같은 결과로 Lb. curvatus ML17이 묵은지를 포함한 발효스타터로 사용되었을 경우 식품의 보존성 향상과 품질 유지 및 균주에 의한 건강 기능성을 부여할 수 있으며 식품, 사료, 의약 분야의 다양한 산업적 활용이 기대된다.

Keywords

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