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Bioprocess and Biosystems Engineering

, Volume 41, Issue 7, pp 1051–1060 | Cite as

Immobilization of cellulase on thermo-sensitive magnetic microspheres: improved stability and reproducibility

  • Juan Han
  • Junhui Rong
  • Yun Wang
  • Qian Liu
  • Xu Tang
  • Cheng Li
  • Liang Ni
Research Paper

Abstract

Magnetic double-shell hybrid microspheres (Fe3O4@SiO2@p(NIPAM-co-GMA)) have been developed as a promising supported substrate for the immobilization of cellulase. Since the surface of the magnetic microspheres not only contains an epoxy group from GMA (glycidyl methacrylate) that can covalently bind to the enzyme, but also has an intelligent temperature response property from NIPAM (N-isopropylacrylamide), the cellulase can be covalently bonded to the magnetic microspheres and have a temperature-sensitive capability. The immobilized cellulase has the recovery ability of cellulase activity after a high-temperature inactivation. The average amount and activity of immobilized enzymes, respectively, was 233 mg g−1, 57.4 U mg−1 under the optimized conditions. The experimental results show that the immobilized cellulase has a wider catalytic temperature range, better temperature and storage stability. The residual activity still remained about 65.6% of the initial activity after the sixth catalysis run, which indicated that the immobilized enzyme had high reproducibility.

Graphical abstract

Keywords

Immobilized enzyme Cellulase Magnetic microspheres Thermo-sensitive 

Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (nos. 21676124, 31470434 and 21576124), China Postdoctoral Science Foundation funded project (no. 2017M610308), and Jiangsu Postdoctoral Science Foundation funded project (no. 1701107B).

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Juan Han
    • 1
  • Junhui Rong
    • 2
  • Yun Wang
    • 2
  • Qian Liu
    • 2
  • Xu Tang
    • 2
  • Cheng Li
    • 2
  • Liang Ni
    • 2
  1. 1.School of Food and Biological EngineeringJiangsu UniversityZhenjiangChina
  2. 2.School of Chemistry and Chemical EngineeringJiangsu UniversityZhenjiangChina

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