Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (11): 20220328.doi: 10.7503/cjcu20220328

• Article: Inorganic Chemistry • Previous Articles     Next Articles

Properties of Transition Metal-biimidazole-Dawson-type Tungstophosphate Hybrid Compounds as Supports for Enzyme Immobilization

ZHU Haotian1,2, JIN Meixiu1, TANG Wensi2, SU Fang1(), LI Yangguang2()   

  1. 1.Key Laboratory of Polyoxometalate and Reticular Material Chemistry,Ministry of Education,Faculty of Chemistry,Northeast Normal University,Changchun 130024,China
    2.School of Chemistry and Chemical Engineering,Liaoning Normal University,Dalian 116029,China
  • Received:2022-05-12 Online:2022-11-10 Published:2022-06-21
  • Contact: SU Fang,LI Yangguang E-mail:sufang861218@163.com;liyg658@nenu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(22071020)

Abstract:

Five Dawson-type polyoxometalate(POM)-based organic-inorganic hybrids, namely, [Ni(H2biim)34·[Ni(H2biim)2(P2W18O622]·2H2O(1), [CoIII(H2biim)32[P2W18O62]·8H2O(2), [Cu(H2biim)23[P2W18O62]·4H2O(3), [Co(H2biim)32H2[P2W18O62]·9H2O(4) and [Ni(H2biim)33[P2W18O62]·2H2O(5), were constructed from transition metal-biimidazole(TM-H2biim) coordination cations and tungstophosphate polyoxoainons through hydrothermal and direct precipitation methods, and characterized by single crystal X-ray diffraction analysis, infrared(IR) spectroscopy and thermogravimetry-differential thermal analysis(TG-DTA). Compounds 15 were used as the supports for immobilizing horseradish peroxidase(HRP), exhibiting high load capacities. In addition, the reusabi?lity, storage stability and the performance for detecting hydrogen peroxide(H2O2) of the obtained immobilized enzymes HRP/1—HRP/5 were also evaluated by circular dichroism(CD) spectroscopy and laser scanning confocal microscopy(LSCM). The experimental results show that the immobilization of HRP on POMs can be realized by the simple physical adsorption method. There is a strong interaction between POM and HRP, and the HRP immobilization by POM not only improves the tolerance of HRP to the operation and storage environment, but also expands the application of POMs in the field of enzyme immobilization.

Key words: Dawson-type tungstophosphate, Transition metal-biimidazole complex, Horseradish peroxidase, Enzyme immobilization, Hydrogen peroxide detection

CLC Number: 

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