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Production of γ-amino Butyric Acid by Lactic Acid Bacteria in Skim Milk

탈지방우유에서 가바생성 유산균 배양을 통한 가바생성 연구

  • Cha, Jin Young (East Sea Rim Marine and Fisheries Research Institute, Handong Global University) ;
  • Kim, Young Rok (East Sea Rim Marine and Fisheries Research Institute, Handong Global University) ;
  • Beck, Bo Ram (Research Center, Immunus Co., Ltd.) ;
  • Park, Ji Hun (East Sea Rim Marine and Fisheries Research Institute, Handong Global University) ;
  • Hwang, Cher Won (East Sea Rim Marine and Fisheries Research Institute, Handong Global University) ;
  • Do, Hyung Ki (East Sea Rim Marine and Fisheries Research Institute, Handong Global University)
  • 차진영 (한동대학교 환동해해양수산연구소) ;
  • 김영록 (한동대학교 환동해해양수산연구소) ;
  • 백보람 ((주)이뮤너스) ;
  • 박지헌 (한동대학교 환동해해양수산연구소) ;
  • 황철원 (한동대학교 환동해해양수산연구소) ;
  • 도형기 (한동대학교 환동해해양수산연구소)
  • Received : 2017.02.17
  • Accepted : 2018.01.22
  • Published : 2018.02.28

Abstract

Lactic acid bacteria were isolated from a variety of fermented seafoods and sea creatures from the East Sea Rim, Korea and were screened for ${\gamma}-amino$ butyric acid-producing (GABA) activity. Through a 16S rRNA sequence analysis, the bacteria of interest, which were GABA-positive on the thin-layer chromatography analysis, were recognized as three isolates of Lactobacillus (Lb.) brevis and one isolate of Lactococcus (Lc.) lactis. Lb. brevis FSFL0004 and FSFL0005 were isolated from fermented anglerfish and Lb. brevis FSFL0036 was derived from salted cutlass fish. The Lc. lactis strain FGL0007 was isolated from the gut of a brown sole flounder. According to HPLC analysis, the GABA contents produced by FSFL0004, FSFL0005, FSFL0036 and FGL0007 were equivalent to $10,754.37{\mu}g/ml$, $13,082.79{\mu}g/ml$, $12,290.19{\mu}g/ml$, and $45.07{\mu}g/ml$ respectively in 1% monosodium glutamate-supplemented methionyl-tRNA synthetase (MRS) broth. The four strains were inoculated in skim milk with 1% monosodium glutamate to commercialize the strains as starter cultures for GABA-enriched dairy products, and TLC results displayed the production of ${\gamma}-amino$ butyric acid by all four strains in the adaptation media. Lc. lactis FGL0007 demonstrated the greatest GABA production ($431.42{\mu}g/ml$) by HPLC analysis. The GABA production by lactic acid bacteria strains in the skim milk demonstrated in the present study may be helpful for the production of GABA-enriched dairy products.

동해안 지역 수산발효식품과 수산물로부터 다양한 종류의 유산균들을 분리하여 감마아미노낙산(GABA) 활성을 위해 분석을 하였다. 박층크로마토그래피(TLC)를 이용하여 GABA를 생성하는 4개의 균주를 확보하였으며, 16S rRNA sequencing 분석 결과를 통해 FSFL0004, FSFL0005, FSFL0036 균주는 Lactobacillus (Lb.) brevis, 그리고 FGL0007은 Lactococcus (Lc.) lactis에 가장 유사한 것으로 확인하였다. Lb. brevis FSFL0004와 FSFL0005는 발효된 아귀로부터 분리되었고, Lb. brevis FSFL0036는 갈치 젓갈로부터 분리되었으며, Lc. lactis FGL0007 균주는 참가자미의 내장으로부터 분리되었다. 고속액체크로마토그래피(HPLC)를 사용한 정량분석결과를 보면, FSFL0004, FSFL0005, FSFL0036과 FGL0007에서 각각 $10,754.37{\mu}g/ml$, $13,082.79{\mu}g/ml$, $12,290.19{\mu}g/ml$, $45.07{\mu}g/ml$의 GABA가 생성되었다. GABA가 풍부한 낙농제품의 발효 종균으로서 상용화 실험을 위해 1% MSG를 포함한 탈지방우유에 4개의 균주를 각각 접종하였다. TLC 결과를 보면 4개의 균주 모두가 GABA 생성을 보였다. HPLC 분석 결과를 보면, 4균주 중 Lc. lactis FGL0007이 가장 높은 GABA 생성($431.42{\mu}g/ml$)을 보였다. 본 연구의 내용은 GABA가 함유된 유제품 개발의 기반이 될 수 있을 것으로 생각한다.

Keywords

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