Food Science and Preservation (한국식품저장유통학회지)

The Korean Society of Food Preservation (한국식품저장유통학회)
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Quality characteristics of Weissella confusa strain having gluten degradation activity from salted seafood

젓갈로부터 분리된 글루텐 분해능을 가지는 Weissella confusa 균주와 특성

  • Received : 2016.10.07
  • Accepted : 2016.10.29
  • Published : 2016.11.30
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Abstract

A new lactic acid bacteria with gluten-degrading activity which was isolated from salted sea foods (traditional Korea fermented food), identified as Weissella confusa (99%) by use of API kit and 16S rRNA sequencing, and designated as W. confusa. When the W. confusa cultured for 48 hours at $30^{\circ}C$ in a MRS medium containing 1% gluten, 45% of gluten was founded to be degraded. W. confusa showed 85% of survival rate at pH 3, and 94% tolerance at 0.1% oxgall, which indicates that W. confusa would survive in stomach of human. Experiments on the thermostability was confirmed that it has a stability of 70% in $50^{\circ}C$. W. confusa inhibited the growth of some pathogen, except for S. aureus. Results in this study suggest that using W. confusa for fermentation of grain flour containing gluten would be desirable to prepare the gluten-free foods needed for those who suffer from celia disease and gluten allergy.

본 실험에서는 발효식품 중 하나인 젓갈로부터 글루텐 분해능을 가지는 유산균은 선별하여 API 당 발효성과 16S rRNA를 분석한 결과 Weissella confusa로 동정되었다. 1% 글루텐이 함유된 MRS 배지에서 48시간 배양하였을 때 글루텐에 의한 탁도가 감소되는 것 을 확인하였고, 배양 상등액을 이용한 반죽의 발효에서 대수증식기 직후인 24시간째의 배양 상등액이 글루텐을 감소시킬 수 있는 발효의 효율성이 가장 높게 나타났다. 배양 후 36시간이나 48시간의 배양 상등액을 이용하는 것은 생균수가 감소하는 것으로 보아 사멸기에 접어들어 효소 활성이 감소하는 것으로 판단되었으며 발효 효율도 높지 않았다. 프로바이오틱스로서 이용 가능성을 확인하기 위하여, W. confusa의 열에 대한 안정성 및 산과 담즙에 대한 내성을 확인해본 결과 $40^{\circ}C$까지는 열에 대한 안정성을 나타내었고, pH 3에서도 89%의 생존율을 나타내므로 위액에 의해 죽지 않고 위 장관까지 생존 할 수 있을 것으로 판단되었다. 또한 0.6% oxgall에서도 73%의 내성을 유지하므로 담즙액에 대한 내성을 갖는다고 판단되고, 이 결과로 W. confusa는 프로바이오틱스 및 발효식품으로 개발 시 체내에 유용하게 작용할 수 있을 것으로 판단된다. 또한 8종의 병원성균들에 대한 저항성 실험을 통해 S. aureus를 제외한 나머지 그람 음성과 양성균의 생육을 저지하는 것을 확인하는 것으로 나타났다. 그러므로 W. confusa 을 이용하여 밀가루를 발효하여 글루텐 프리 가공식품을 제조할 수 있을 것으로 보이며, 발효 식품 및 프로바이오틱스로서 생균으로 섭취 시 장 내의 글루텐 분해에 의한 셀리악 질병 및 글루텐 알레르기 예방에 효과가 있을 것이고 항균활성으로 인한 내장 질환을 예방할 수 있을 것이라고 추측된다.

Keywords

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