Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
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Fermentation and Quality Characteristics of Cheonggukjang Fermented with Bacillus subtilis BC-P1

Bacillus subtilis BC-P1 균주를 이용하여 제조한 청국장의 발효 및 품질 특성분석

  • Received : 2013.07.05
  • Accepted : 2013.09.04
  • Published : 2013.09.30
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Abstract

The object of this study was to improve the quality of Cheonggukjang with new starter, Bacillus subtilis BC-P1. Twenty strains were isolated from the commercial cheonggukjang and 1 Bacillus strain (BC-P1) with protease activity was selected. The 16S rRNA gene sequence revealed that the BC-P1 was closely related to B. subtilis with 99% homology. The quality characteristics of chunggukjang fermented with B. subtilis BC-P1, Bacillus nato (PC) and commercial chunggukjang (NC) were investigated. The characteristics of fermentation were determined by protease, lipase, xylanase, chitinase, and fibrinolytic activities, reducing sugar, nutrient composition and amino acid contents of cheonggukjang sample. Cheonggukjang fermented with B. subtilis BC-P1 showed the strongest fibrinolytic, xylanase, and chitinase activities. Reducung sugar contents of Cheonggukjang samples were $30.16{\pm}2.11$ mg/g (NC), $28.56{\pm}1.52$ mg/g (PC), $32.39{\pm}1.87$ mg/g (BC-P1). And their total amino acid contents were 338.99 mg% (NC), 445.19 mg% (PC), 741.35 mg% (BC-P1). These results suggested that B. subtilis BC-P1 was suitable to be used as a starter to enhance the quality and effects of cheonggukjang.

본 연구진은 청국장에서 수종의 미생물을 분리하였으며, 이중 소화 효소능이 뛰어난 균주를 선별하였으며, 유전학적 분석결과를 통해 본 균주가 Bacillus 속 균주임을 확인하고 Bacillus subtilis BC-P1이라 명명하였다. Bacillus subtilis BC-P1을 starter로 사용하여 청국장을 제조하였으며, protease, xylanase, chitinase activity, 혈전 분해능, 영양성분 분석 및 아미노산 분석을 통하여 B. subtilis BC-P1를 starter로 활용한 청국장 제품의 개선 가능성을 타진하였다. Bacillus subtilis BC-P1를 starter로 제조한 청국장은 기존 제품에 비해 우수한 소화효소 생성능을 보였으며, 특히 혈전분해효소 생성능이 우수함을 확인하였고, 대조군에 비해 증가된 환원당 및 총 아미노산 함량을 확인 할 수 있었다. 따라서 본 균주를 starter로 하여 청국장을 제조할 경우 기능성분, 생리활성의 증가, 품질 향상을 기대할 수 있을 것으로 판단되며, 향후 대규모 생산시 균주, 제조 조건에 관한 연구가 필요할 것으로 사료된다.

Keywords

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