Volume 135, Issue 7 e202216699
Forschungsartikel

Enhanced Activity of Enzyme Immobilized on Hydrophobic ZIF-8 Modified by Ni2+ Ions

Xiao-Gang Yang

Corresponding Author

Xiao-Gang Yang

College of Chemistry and Chemical Engineering, Luoyang Normal University, Henan Key Laboratory of Function-Oriented Porous Materials, Luoyang, 471934 P. R. China

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Ji-Rui Zhang

Ji-Rui Zhang

College of Chemistry and Chemical Engineering, Luoyang Normal University, Henan Key Laboratory of Function-Oriented Porous Materials, Luoyang, 471934 P. R. China

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Xu-Ke Tian

Xu-Ke Tian

College of Chemistry and Chemical Engineering, Luoyang Normal University, Henan Key Laboratory of Function-Oriented Porous Materials, Luoyang, 471934 P. R. China

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Jian-Hua Qin

Jian-Hua Qin

College of Chemistry and Chemical Engineering, Luoyang Normal University, Henan Key Laboratory of Function-Oriented Porous Materials, Luoyang, 471934 P. R. China

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Xin-Ya Zhang

Xin-Ya Zhang

College of Chemistry and Chemical Engineering, Luoyang Normal University, Henan Key Laboratory of Function-Oriented Porous Materials, Luoyang, 471934 P. R. China

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Lu-Fang Ma

Corresponding Author

Lu-Fang Ma

College of Chemistry and Chemical Engineering, Luoyang Normal University, Henan Key Laboratory of Function-Oriented Porous Materials, Luoyang, 471934 P. R. China

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First published: 19 December 2022
Citations: 2

Abstract

The development of efficient enzyme immobilization to promote their recyclability and activity is highly desirable. Zeolitic imidazolate framework-8 (ZIF-8) has been proved to be an effective platform for enzyme immobilization due to its easy preparation and biocompatibility. However, the intrinsic hydrophobic characteristic hinders its further development in this filed. Herein, a facile synthesis approach was developed to immobilize pepsin (PEP) on the ZIF-8 carrier by using Ni2+ ions as anchor (ZIF-8@PEP-Ni). By contrast, the direct coating of PEP on the surface of ZIF-8 (ZIF-8@PEP) generated significant conformational changes. Electrochemical oxygen evolution reaction (OER) was employed to study the catalytic activity of immobilized PEP. The ZIF-8@PEP-Ni composite attains remarkable OER performance with an ultralow overpotential of only 127 mV at 10 mA cm−2, which is much lower than the 690 and 919 mV overpotential values of ZIF-8@PEP and PEP, respectively.

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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