Chem. J. Chinese Universities ›› 2019, Vol. 40 ›› Issue (9): 1888.doi: 10.7503/cjcu20190185

• Organic Chemistry • Previous Articles     Next Articles

Efficient Enzyme Immobilization by Combining Adsorption and Cellulose Membrane Coating

WU Rong1,2,DONG Qihui1,2,SUN Yiyi1,SU Erzheng1,2,*()   

  1. 1. Department of Food Science and Technology, College of Light Industry and Food Engineering, Nanjing Forestry University
    2. Co-innovation Center for the Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China
  • Received:2019-03-27 Online:2019-09-10 Published:2019-07-29
  • Contact: SU Erzheng E-mail:ezhsu@njfu.edu.cn
  • Supported by:
    ? Supported by the Six Talent Peaks Project in Jiangsu Province, China(2015-JY-016);the China Postdoctoral Science Foundation(2016M600417, 2017T100373);the 333 Project of Jiangsu Province, China(BRA20174586)

Abstract:

The papain was used as a model enzyme to develop an immobilized enzyme method based on combination of adsorption and cellulose membrane coating. The type of adsorption carries, cellulose category and the solvent type for dissolving cellulose, protectant category and concentration, drying mode and time were systematically optimized. The best adsorption-cellulose coating combined immobilization process was adopting diatomite or HPD-417(macroporous resin) as adsorption carrier, methylcellulose(molecular weight 40000—50000) acetone solution as coating solution, 6%(mass fraction) polyethylene glycol or maltose as the protectant for membrane coating, and drying at 4 ℃ for 9 h. The prepared immobilized papain showed high enzyme activity recovery rate, which attained to 96.50% for diatomite adsorbing-cellulose coating immobilized papain and 93.92% for HPD-417 adsorbing-cellulose coating immobilized papain. Finally, the properties of the immobilized enzyme were investigated. The results showed that the adsorbing-cellulose coating immobilized papain had better thermal stability. After being stored at 80 ℃ for 12 h, the residual activity of the immobilized enzyme remained about 90%. In the range of pH=4.5—9.5, the stability of the immobilized enzyme was better. After being continuously used for 9 batches, the residual activity of the immobilized enzyme remained about 95%.

Key words: Enzyme immobilization, Adsorption, Cellulose coating, Combined immobilization, Methyl cellulose, Protectant, Papain

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