Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Enhanced Production of Cellobiase by a Marine Bacterium, Cellulophaga lytica LBH-14, in Pilot-Scaled Bioreactor Using Rice Bran

파이롯트 규모에서 미강을 이용한 해양미생물 Cellulophaga lytica LBH-14 유래의 cellobiase 생산

  • Cao, Wa (Department of Biotechnology, College of Natural Resources and Life Science, Dong-A University) ;
  • Kim, Hung-Woo (Department of Biotechnology, College of Natural Resources and Life Science, Dong-A University) ;
  • Li, Jianhong (College of plant Science & Technology, Huazhong Agricultural University) ;
  • Lee, Jin-Woo (BK21 Bio-Silver Program of Dong-A University)
  • 고와 (동아대학교 대학원 의생명과학과) ;
  • 김형우 (동아대학교 대학원 의생명과학과) ;
  • 이잔홍 (중국 화중농업대학교 식물과학기술대학) ;
  • 이진우 (동아대학교 BK21 생물자원 실버바이오사업 인력양성단)
  • Received : 2013.01.04
  • Accepted : 2013.04.16
  • Published : 2013.04.30
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Abstract

The aim of this work was to establish the optimal conditions for the production of cellobiase by a marine bacterium, Cellulophaga lytica LBH-14, using response-surface methodology (RSM). The optimal conditions of rice bran, ammonium chloride, and the initial pH of the medium for cell growth were 100.0 g/l, 5.00 g/l, and 7.0, respectively, whereas those for the production of cellobiase were 91.1 g/l, 9.02 g/l, and 6.6, respectively. The optimal concentrations of $K_2HPO_4$, NaCl, $MgSO_4{\cdot}_{7H2}O$, and $(NH_4)_2SO_4$ for cell growth were 6.25, 0.62, 0.28, and 0.42 g/l, respectively, whereas those for the production of cellobiase were 4.46, 0.36, 0.27, and 0.73 g/l, respectively. The optimal temperatures for cell growth and for the production of cellobiase by C. lytica LBH-14 were 35 and $25^{\circ}C$, respectively. The maximal production of cellobiase in a 100 L bioreactor under optimized conditions in this study was 92.3 U/ml, which was 5.4 times higher than that before optimization. In this study, rice bran and ammonium chloride were developed as carbon and nitrogen sources for the production of cellobiase by C. lytica LBH-14. The time for the production of cellobiase by the marine bacterium with submerged fermentations was reduced from 7 to 3 days, which resulted in enhanced productivity of cellobiase and a decrease in its production cost. This study found that the optimal conditions for the production of cellobiase were different from those of CMCase by C. lytica LBH-14.

본 연구의 목적은 통계학적 방법을 사용하여 해양미생물 Cellulophaga lytica LBH-14가 생산하는 cellobiase의 생산조건을 확립하는 것이었다. 이 균주의 생육에 최적인 미강, ammonium chloride 및 배지의 초기 pH는 100.0 g/l, 5.00 g/l 및 7.0이었으나, 이 균주가 생산하는 cellobiase의 생산에 최적인 조건은 각각 91.1 g/l, 9.02 g/l 및 6.6이었다. 이 균주의 생육에 최적인 $K_2HPO_4$, NaCl, $MgSO_4{\cdot}7H_2O$ 및 $(NH_4)_2SO_4$ 등과 같은 배지의 염농도는 각각 6.25, 0.62, 0.28 및 0.73 g/l이었으나, cellobiase 생산에 최적인 염들의 농도는 각각 4.46, 0.36, 0.27 및 0.73 g/l이었다. 또한, 균체의 생육 및 cellobiase의 생산에 최적인 온도는 각각 35 및 $25^{\circ}C$이었다. 플라스크 규모에서 최적화한 조건으로 파이롯트 규모의 생물배양기에서 cellobiase를 생산한 결과, 이 균주가 생산하는 cellobiase의 생산성은 92.3 U/ml이었으며, 이는 최적화하기 전에 비하여 5.4배 향상된 것 이었다. 본 연구를 통하여 쌀 도정공정의 부산물인 미강 및 ammonium chloride를 cellobiase를 생산하는 기질로 개발하였으며 해양 미생물을 사용하여 cellobiase의 생산기간을 7일에서 3일로 단축시켰다. 또한, 본 연구를 통하여 C. lytica LBH-14가 생산하는 cellobiase의 최적 생산조건은 이 균주가 생산하는 CMCase의 최적 생산조건과 다르다는 사실을 확인하였다.

Keywords

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