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

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Isolation and Characterization of Bacillus spp. with High-Level Productivity of Poly-γ-Glutamic Acid

Poly-γ-Glutamic Acid 고생성 Bacillus spp. 균주의 분리 및 발효특성

  • Sim, SangHyeob (Department of Food Science and Technology, Chonbuk National University) ;
  • Park, Hong-Jin (Department of Food Science and Technology, Chonbuk National University) ;
  • Oh, HyeonHwa (Department of Food Science and Technology, Chonbuk National University) ;
  • Jeong, Do-Youn (Microbial Institute for Fermentation Industry (MIFI)) ;
  • Song, Geun-Seoup (Department of Food Science and Technology, Chonbuk National University) ;
  • Kim, Young-Soo (Department of Food Science and Technology, Chonbuk National University)
  • 심상협 (전북대학교 식품공학과) ;
  • 박홍진 (전북대학교 식품공학과) ;
  • 오현화 (전북대학교 식품공학과) ;
  • 정도연 ((재)발효미생물산업진흥원) ;
  • 송근섭 (전북대학교 식품공학과) ;
  • 김영수 (전북대학교 식품공학과)
  • Received : 2017.06.20
  • Accepted : 2017.08.02
  • Published : 2017.09.30
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Abstract

Bacillus strains not producing harmful components were isolated from Korean traditional soybean products. Extracellular enzyme activities (amylase, protease, cellulase, and xylanase) of isolated Bacillus strains were measured, and Bacillus strains with high protease activity were selected. The selected 15 strains were identified as Bacillus amyloliquefaciens (10), Bacillus methylotrophicus (1), Bacillus velezensis (1), and Bacillus subtilis (3). Among them, B. subtilis JBG17019, B. amyloliquefaciens JBD17076, and B. amyloliquefaciens JBD17109 showed antimicrobial activities against food-borne microorganisms. The production abilities of glutamate, glutamine, and poly-${\gamma}$-glutamic acid (${\gamma}$-PGA) of the selected Bacillus strains were measured to analyze fermentation characteristics related to glutamic acid metabolism. The factor for multivariate was analyzed by the principal components analysis (PCA) method between fermentation characteristics and ${\gamma}$-PGA production. The three principal components were classified according to the PCA method: PC1 [enzyme activity (amylase, cellulase, and xylanase)], PC2 (${\gamma}$-PGA), and PC3 (protease, glutamate, and glutamine). As a result, B. amyloliquefaciens JBD17076 and B. subtilis JBG17019 strains were evaluated as having excellent enzyme activity and ${\gamma}$-PGA production.

전통장류로부터 식품 유해요소를 생성하지 않는 Bacillus 균주를 분리하여 세포외효소 활성(amylase, protease, cellulase, xylanase)을 측정한 후, 단백질 분해 활성이 우수한 14개 균주와 비교균주 1균주를 선발하였다. 선발된 균주에 대해 16S rRNA 유전자를 이용한 균주 동정을 실시한 결과, B. amyloliquefaciens 10종, B. methylotrophicus 1종, B. velezensis 1종, B. subtilis 3종이 분리 동정되었다. 그중 B. subtilis JBG17019, B. amyloliquefaciens JBD17076, B. amyloliquefaciens JBD17109 균주에서 식중독미생물에 대한 증식 억제능이 확인되었다. Glutamic acid 대사와 관련한 발효특성을 확인하기 위하여 선발된 Bacillus 균주에 대해 glutamate, glutamine 및 ${\gamma}$-PGA 생성능을 측정하였다. 발효특성과 ${\gamma}$-PGA 생성능에 대한 다변량 요인분석을 주성분(PCA) 추출법으로 분석한 결과, PC1(효소 활성(amylase, cellulase, xylanase), PC2(${\gamma}$-PGA 생성능) 및 PC3(protease, glutamate 및 glutamine)의 3가지 주성분이 분류되었다. 주성분(PC)의 추출에 따라 B. amyloliquefaciens JBD17076 및 B. subtilis JBG17019 균주는 우수한 효소 활성 및 ${\gamma}$-PGA 생성을 하는 것으로 평가되었다.

Keywords

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