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Fabrication of graphene oxide decorated with Fe3O4@SiO2 for immobilization of cellulase

  • Yue Li
  • Xiang-Yu Wang
  • Xiao-Ping Jiang
  • Jing-Jing Ye
  • Ye-Wang Zhang
  • Xiao-Yun Zhang
Research Paper

Abstract

Fe3O4@SiO2–graphene oxide (GO) composites were successfully fabricated by chemical binding of functional Fe3O4@SiO2 and GO and applied to immobilization of cellulase via covalent attachment. The prepared composites were further characterized by transmission electron microscopy and Fourier transform infrared spectroscopy. Fe3O4 nanoparticles (NPs) were monodisperse spheres with a mean diameter of 17 ± 0.2 nm. The thickness of SiO2 layer was calculated as being 6.5 ± 0.2 nm. The size of Fe3O4@SiO2 NPs was 24 ± 0.3 nm, similar to that of Fe3O4@SiO2–NH2. Fe3O4@SiO2–GO composites were synthesized by linking of Fe3O4@SiO2–NH2 NPs to GO with the catalysis of EDC and NHS. The prepared composites were used for immobilization of cellulase. A high immobilization yield and efficiency of above 90 % were obtained after the optimization. The half-life of immobilized cellulase (722 min) was 3.34-fold higher than that of free enzyme (216 min) at 50 °C. Compared with the free cellulase, the optimal temperature of the immobilized enzyme was not changed; but the optimal pH was shifted from 5.0 to 4.0, and the thermal stability was enhanced. The immobilized cellulase could be easily separated and reused under magnetic field. These results strongly indicate that the cellulase immobilized onto the Fe3O4@SiO2–GO composite has potential applications in the production of bioethanol.

Keywords

Graphene Magnetic nanoparticles Cellulase Immobilization Covalent attachment 

Notes

Acknowledgments

The financial support from National Science Foundation of China (No. 21376110) and Jiangsu University (08JDG004) was appreciated.

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Copyright information

© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  1. 1.School of PharmacyJiangsu UniversityZhenjiangPeople’s Republic of China
  2. 2.School of Food and Biological EngineeringJiangsu UniversityZhenjiangPeople’s Republic of China

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