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Statistical Optimization of Medium for Formate-driven Bio-hydrogen Production by the Hyperthermophilic Archaeon, Thermococus onnurineus

초고온성 고세균 Thermococcus onnurineus의 개미산으로부터 바이오수소 생산을 위한 통계적 배지 최적화

  • 이성목 (한국해양과학기술원 해양생명공학연구센터) ;
  • 김태완 (전남대학교 생물공학과) ;
  • 이현숙 (한국해양과학기술원 해양생명공학연구센터) ;
  • 이정현 (한국해양과학기술원 해양생명공학연구센터) ;
  • 강성균 (한국해양과학기술원 해양생명공학연구센터)
  • Received : 2017.09.29
  • Accepted : 2017.12.01
  • Published : 2017.12.30

Abstract

Medium compositions for the hyperthermophilic archaeon, Thermococcus onnurineus NA1 was statistically optimized to enhance formate-driven hydrogen ($H_2$) production by using response surface methodology. From the Plackett-Burman design-based experiment, it was confirmed that among the minor components of medium such as KCl, $MgSO_4$, $NH_4Cl$, Cystein-HCl, trace elements, Fe-EDTA and $CaCl_2$, the trace elements were screened as the only positively effective components with respect to $H_2$ production. Subsequently, the optimal concentrations of the trace elements and the major components of a medium such as NaCl, yeast extract and sodium formate were determined from the five-level central composite design (CCD)-based experiment. The resulting quadratic model predicted the maximum $H_2$ production of 46.6 mmol/L in serum bottle and it was validated experimentally using the optimal medium initially supplemented with 26.70 g/L of NaCl, 9.81 g/L of sodium formate, 3.50 g/L of yeast extract and 4.59 mL/L of trace elements. From the duplicate batch cultivations in the fermentor using the optimized medium, the a maximum $H_2$ production rate up to 71.8 mmol/L/h could be obtained, which was a 65% enhanced value compared with that obtained using the control medium, showing the high efficiency of the optimized medium.

Keywords

References

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