Chem. J. Chinese Universities ›› 2019, Vol. 40 ›› Issue (2): 210.doi: 10.7503/cjcu20180517

• Inorganic Chemistry • Previous Articles     Next Articles

Preparation of Yolk-shell Fe3O4@SiO2@PMO Magnetic Microspheres for Laccase Immobilization

DUAN Bingyi, WANG Yu, GUO Ningning, WANG Runwei*(), ZHANG Zongtao, QIU Shilun   

  1. College of Chemistry, State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun 130012, China
  • Received:2018-07-24 Online:2019-02-10 Published:2018-11-05
  • Contact: WANG Runwei E-mail:rwwang@jlu.edu.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(Nos.21771082, 21771081, 21261130584)

Abstract:

Yolk-shell Fe3O4@SiO2@PMO magnetic microspheres were prepared and used to immobilize laccase using glutaraldehyde as the crosslinking agent. The influence of some experimental factors, such as glutaraldehyde concentration, crosslinking time and immobilization time, on laccase immobilization were investigated. The largest immobilization amount of laccase in the Fe3O4@SiO2@PMO microspheres is 475 mg/g. After immobilization, the laccase could survive in harsh environment, showing relative enzyme activities of 70% and 65% at pH=2.5—4.5 and 60 ℃, respectively. This means immobilization on Fe3O4@SiO2@PMO could afford higher stability than bare laccase. Besides, immobilized laccase could be recycled easily via simply magnetic separation, with activity retention of 85% even after 10 times recycle.

Key words: Periodic mesoporous hybrid inorganic-organic silica, Yolk-shell magnetic microspheres, Laccase, Immobilization

CLC Number: 

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