Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (2): 20210705.doi: 10.7503/cjcu20210705

• Physical Chemistry • Previous Articles    

Preparation, Characterization and Degradation to BPA of Pomegranate-like Gel Microsphere Entrapmented Laccase

ZHOU Ning1,2, TANG Xiaohua2(), CAO Hong1(), ZHA Fei2, LI Chun3, XIE Chunyan1, XU Mingping1, SUN Yige1   

  1. 1.College of Biological Chemical Sciences and Engineering,Jiaxing University,Jiaxing 314001,China
    2.College of Chemistry and Engineering,Northwest Normal University,Lan Zhou 730070,China
    3.Department of Chemical Engineering,Tsinghua University,Beijing 100084,China
  • Received:2021-10-06 Online:2022-02-10 Published:2021-12-06
  • Contact: TANG Xiaohua,CAO Hong E-mail:tom0725@163.com;chyf_ch@126.com
  • Supported by:
    the National Natural Science Foundation of China(21266029);the Natural Science Foundation of Zhejiang Province, China(LY17B060011)

Abstract:

The pomegranate-like gel microsphere Alg@Cu3/Zn3(PO42@Lac was prepared by double embedding laccase in copper/zinc composite metal phosphate crystals and calcium alginate gel. Characterized by SEM, EDX and FTIR, the laccase was successfully embedded in copper/zinc composite metal phosphate crystals coated by calcium alginate. And the copper/zinc composite metal phosphate crystals were entrapped in the mesh pores of the calcium alginate gel like pomegranate-shaped. Enzymatic properties with ABTS as a substrate show that the heat resistance, acid resistance and storage stability of Alg@Cu3/Zn3(PO42@Lac are enhanced under the double protection of inorga-nic salt crystals and calcium alginate gel compared to free laccase. Alg@Cu3/Zn3(PO42@Lac was applied to the degradation of bisphenol A(BPA), and an aperture diameter of approximately 1 mm filter was used to achieve rapid recovery. The degradation rate of BPA decreased by only about 14% after six cycles, showing relatively stable reavailability, mainly due to the dual protection of calcium alginate and copper/zinc inorganic salt crystals. This paper provides the method and basis for establishing a new immobilization technology to enzyme.

Key words: Copper/zinc composite metal phosphate crystal, Calcium alginate gel, Laccase, Immobilization, Bisphenol A(BPA)

CLC Number: 

TrendMD: