Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Statistical Optimization for Production of Carboxymethylcellulase from Rice Hulls by a Newly Isolated Marine Microorganism Bacillus licheniformis LBH-52 Using Response Surface Method

통계학적인 방법과 왕겨를 기질로 사용하여 해양에서 분리한 Bacillus licheniformis LBH-52 를 사용한 carboxymethylcellualse의 생산조건 최적화

  • Kim, Hye-Jin (Department of Medical Bioscience, Graduate School of Donga-A University) ;
  • Gao, Wa (Department of Medical Bioscience, Graduate School of Donga-A University) ;
  • Chung, Chung-Han (BK21 Bio-Silver Program of Dong-A University) ;
  • Lee, Jin-Woo (BK21 Bio-Silver Program of Dong-A University)
  • 김혜진 (동아대학교 대학원 의생명과학과) ;
  • 고와 (동아대학교 대학원 의생명과학과) ;
  • 정정한 (동아대학교 BK21 생물자원 실버바이오 산업화 인력양성 사업단) ;
  • 이진우 (동아대학교 BK21 생물자원 실버바이오 산업화 인력양성 사업단)
  • Received : 2011.05.21
  • Accepted : 2011.07.05
  • Published : 2011.08.30
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Abstract

A microorganism utilizing rice hulls as a substrate for the production of carboxymethylcellulase (CMCase) was isolated from seawater and identified as Bacillus lincheniformis by analyses of its 16S rDNA sequences. The optimal carbon and nitrogen sources for production of CMCase were found to be rice hulls and ammonium nitrate. The optimal conditions for cell growth and the production of CMCase by B. lincheniformis LBH-52 were investigated using the response surface method (RSM). The analysis of variance (ANOVA) of results from central composite design (CCD) indicated that a highly significant factor ("probe>F" less than 0.0001) for cell growth was rice hulls, whereas those for production of CMCase were rice hulls and initial pH of the medium. The optimal conditions of rice hulls, ammonium nitrate, initial pH, and temperature for cell growth extracted by Design Expert Software were 48.7 g/l, 1.8 g/l, 6.6, and 35.7$^{\circ}C$, respectively, whereas those for the production of CMCase were 43.2 g/l, 1.1 g/l, 6.8, and 35.7$^{\circ}C$. The maximal production of CMCase by B. lincheniformis LBH-52 from rice hulls under optimized conditions was 79.6 U/ml in a 7 l bioreactor. In this study, rice hulls and ammonium nitrate were developed to be substrates for the production of CMCase by a newly isolated marine microorganism, and the time for production of CMCase was reduced to 3 days using a bacterial strain with submerged fermentation.

왕겨를 기질로 사용하여 carboxymethylcellualse (CMCase)를 생산하는 미생물을 해수에서 분리하였으며 16S rDNA의 염기서열을 분석하여 동정한 결과, Bacillus lichemiformis로 확인되었다. CMCase를 생산하기 위한 최적의 탄소원과 질소원은 왕겨와 암모니움 나이트레이트이었다. 통계학적인 방법인 response surface method (RSM)을 사용하여 CMCase를 생산하기 위한 조건을 최적화하였다. 통계학적인 분석 결과, 왕겨가 균체의 생육에 미치는 영향이 가장 높았으며, 왕겨와 배지의 초기 pH가 CMCase 생산에 미치는 영향이 높았다. Design Expert Software를 사용하여 결과를 분석한 결과, 균체의 생장에 최적인 조건은 48.7 g/l 왕겨, 1.8 g/l 암모니움 나이트레이트, 배지의 초기 pH 6.8 및 배양온도 35.7$^{\circ}C$이었으나, CMCase의 생산에 최적인 조건은 43.2 g/l 왕겨, 1.1 g/l 암모니움 나이트레이트, 배지의 초기 pH 6.8 및 배양온도 35.7$^{\circ}C$이었다. 최적화된 조건에서 왕겨를 기질로 사용하여 B. lincheniformis LBH-52가 생산하는 CMCase는 79.6 U/ml이었다. 본 연구를 통하여 왕겨와 암모니움 나이트레이트를 CMCase를 생산하는 기질로 개발하였으며, 해수에서 분리한 미생물을 사용하여 생산기간을 3일로 단축하였다.

Keywords

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