Controllable fabrication of polymeric microparticles loaded with enzyme@ZIF-8

doi:10.16085/j.issn.1000-6613.2021-0896

Abstract

Abstract:

Enzyme@ZIF-8/PAM-AA microparticles with excellent catalytic, storage and environmental tolerance properties, were synthesized by in situ growth of enzyme@ZIF-8 nanoparticles via biomineralization on uniform polyacrylamide-co-acrylic acid hydrogel (PAM-AA) microparticles from microfluidics. The microparticles showed average sizes of 559.97μm, with CV value of 2.17%, exhibiting good monodispersity. The enzyme@ZIF-8 nanoparticles mainly grew in situ on the microparticle surface, which facilitated their effective contact with the substrates for catalytic reaction. The catalytic performance of the microparticles was studied by using hydrogen peroxidase as the typical enzyme. The results showed that, the microparticles exhibited good catalytic performance, as well as good storage properties and environmental tolerance.The microparticles maintained about 75% of relative activity after treatment with 80℃ water, UV irradiation and trypsin for 30 min, respectively. Moreover, their enzymatic activity remained nearly unchanged after stored at room temperature for 7 days. This work provided a new strategy for design and fabrication of novel advanced functional microparticles for enzyme immobilization.

Key words: enzyme immobilization, metal organic frameworks, microfluidics, hydrogel, microparticles, biocatalysis

摘要：

通过仿生物矿化法在微流控法制备的均一聚丙烯酰胺-共聚-丙烯酸水凝胶（PAM-AA）微颗粒上原位生长酶@ZIF-8纳米颗粒，本文成功构建了具有优良催化性能、储存性能和环境耐受性能的酶@ZIF-8/PAM-AA微颗粒。该微颗粒的平均粒径为559.97μm，CV值为2.17%，具有良好的单分散性。在该微颗粒中，酶@ZIF-8纳米颗粒主要原位生长于微颗粒的表面，有利于其有效地与底物接触进行催化反应。以过氧化氢酶为典型的酶研究该微颗粒的催化性能发现，该微颗粒在具有良好催化性能的同时还展现出良好的储存性能和环境耐受性。该微颗粒分别经30min的80℃热处理、紫外线照射或胰蛋白酶处理后，仍能保持约75%的相对活性；此外，微颗粒在常温下经过7天后，其酶活性几乎维持不变。该工作为设计和构建具有优良性能的新型酶固定化功能微颗粒提供了一种新策略。

关键词: 酶固定化, 金属有机骨架, 微流控, 水凝胶, 微颗粒, 生物催化

CLC Number:

TQ317

ZHANG Yan, WANG Wei, XIE Rui, JU Xiaojie, LIU Zhuang, CHU Liangyin. Controllable fabrication of polymeric microparticles loaded with enzyme@ZIF-8[J]. Chemical Industry and Engineering Progress, 2022, 41(4): 2022-2028.

张彦, 汪伟, 谢锐, 巨晓洁, 刘壮, 褚良银. 负载酶@ZIF-8复合物的聚合物微颗粒可控制备[J]. 化工进展, 2022, 41(4): 2022-2028.

Figures/Tables 8

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