미생물학회지 (Korean Journal of Microbiology)

  • 제51권1호
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  • Pages.48-60
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  • 2015
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  • 0440-2413(pISSN)
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  • 2383-9902(eISSN)
한국미생물학회 (The Microbiological Society of Korea)
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전통 장류 유래 Bacillus subtilis SCJ4의 특성확인 및 통계학적 방법을 이용한 배양조건 최적화

Identification of characterization and statistical optimization of medium constituent for Bacillus subtilis SCJ4 isolated from Korean traditional fermented food

  • 투고 : 2015.02.05
  • 심사 : 2015.02.26
  • 발행 : 2015.03.31
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초록

순창군에서 제조된 전통 장류로부터 612종의 다양한 미생물을 분리하였고, 612종의 미생물 중에서 생리활성 분석 및 biogenic amine 생성여부를 조사하여 최종적으로 Bacillus subtilis SCJ4를 선별하였다. 최종 선별한 균주 SCJ4의 생화학적 특성과 16S rRNA 염기서열 분석에 의해 B. subtilis SCJ4로 명명하였으며, B. subtilis SCJ4의 산업적으로 사용이 적합한 최적배지조성을 확립하기 위하여 통계학적 방법인 반응표면 분석법을 사용하였다. 실험계획법은 배지조성을 예측하기 위해 Plackett-Burman design을 사용하여 모델을 설정하였다. 실험 모델을 통하여 선별된 배지 조성으로는 tryptone, peptone, $MgSO_4$로 예측되었으며, 배지조성에 대한 농도를 설정하기 위해 중심합성계획법을 사용하여 최적화를 수행하였다. 최종 예측된 배지 조성의 농도는 tryptone 15.35 g/L, peptone 12.235 g/L, $MgSO_4$ 3.5 g/L로 예측되었다. 이때 최대 균체량은 1.07497 g/L로 예측되었으며, 모델의 검증실험을 통하여 예측된 모델과 실제 결과가 동일함을 확인하였으며, 기본배양배지와 비교하였을 때 균체량이 0.8767 g/L에서 1.1222 g/L으로 약 28%증가하였다.

612 strains isolated from Korean traditional fermented food in Sunchang and their investigated biochemical characterization and ability of biogenic amines non-producing. We selected the SCJ4 having various activity by measurement of extracellular enzyme, antioxidant and antimicrobial activities. Selected strain SCJ4 by 16S rRNA sequencing and biochemical characterization was named Bacillus subtilis SCJ4. And then, we investigated cell growth of SCJ4, and optimized of culture medium constituents using response surface methodology as statistically method. Response surface methodology used Plackett-Burman experimental design for screening of medium constituent. Tryptone, peptone and $MgSO_4$ as medium constituent improving cell growth selected. In order to find out optimal concentration on each constituent, we carried out central composite design. Consequently, optimized concentrations of tryptone, peptone and $MgSO_4$ were predicted to be 15.35 g/L, 12.235 g/L, and 3.5 g/L respectively. Through the model verification, we confirmed about 1.28-fold improvement of the dried cell weight from 0.8767 g/L to 1.1222 g/L when compared to basal medium.

키워드

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