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Biotechnology and bioprocess engineering v.10 no.2, 2005년, pp.128 - 135   피인용횟수: 1

Separation of Nattokinase from Bacillus subtilis Fermentation Broth by Expanded Bed Adsorption with Mixed-mode Adsorbent

Lu Miao-Hua    (Department of Chemical and Biochemical Engineering, Zhejiang University   ); Lin Dong-Qiang    (Department of Chemical and Biochemical Engineering, Zhejiang University   ); Wu Yuan-Chun    (Department of Chemical and Biochemical Engineering, Zhejiang University   ); Yun Jun-Xian    (Department of Chemical and Biochemical Engineering, Zhejiang University   ); Mei Le-He    (Department of Chemical and Biochemical Engineering, Zhejiang University   ); Yao Shan-Jing    (Department of Chemical and Biochemical Engineering, Zhejiang University  );
  • 초록

    Mixed-mode hydrophobic/ionic matrices exhibit a salt-tolerant property for adsorbing target protein from high-ionic strength feedstock, which allows the application of undiluted feedstock via an expanded bed process. In the present work, a new type of mixed-mode adsorbent designed for expanded bed adsorption, Fastline $PRO^{\circledR}$ , was challenged for the capture of nattokinase from the high ionic fermentation broth of Bacillus subtilis. Two important factors, pH and ion concentration, were investigated with regard to the performance of nattokinase ad-sorption. Under initial fermentation broth conditions (pH 6.6 and conductivity of 10 mS/cm) the adsorption capacity of nattokinase with Fastline PRO was high, with a maximum capacity of 5,350 U/mL adsorbent. The elution behaviors were investigated using packed bed adsorption experiments, which demonstrated that the effective desorption of nattokinase could be achieved by effecting a pH of 9.5. The biomass pulse response experiments were carried out in order to evaluate the biomass/adsorbent interactions between Bacillus subtilis cells and Fastline PRO, and to demonstrate a stable expanded bed in the feedstock containing Bacillus subtilis cells. Finally, an EBA process, utilizing mixed-mode Fastline PRO adsorbent, was optimized to capture nattokinase directly from the fermentation broth. The purification factor reached 12.3, thereby demonstrating the advantages of the mixed-mode EBA in enzyme separation.


  • 주제어

    expanded bed adsorption .   mixed-mode adsorbent .   nattokinase .   separation.  

  • 참고문헌 (25)

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  • 이 논문을 인용한 문헌 (1)

    1. 2007. "" Biotechnology and bioprocess engineering, 12(3): 265~270     

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