Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 4, Pages 4906-4916Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b19940
Keywords
biocatalysis; interfacial polymerization; dendrimer; immobilization; enantioseparation
Funding
- National Natural Science Foundation of China [J1103514]
- National High Technology Research and Development Program of China [2013AA065805, 2014AA093510]
- Fundamental Research Funds for HUST [2014NY007, 2017KFYXJJ212, 2017KFXKJC010, 2017ICFTSZZ001]
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With the rapid development of biotechnological industry, there is an urgent need for exploiting new materials to immobilize enzymes to improve the performance of biocatalysts. In this paper, hierarchically porous magnetic microspheres (PFMMs) were prepared through solvothermal method and rapidly grafted with a novel rigid-flexible dendrimer first synthesized from monomers of trimesoyl chloride (TMC) and 1,6-hexanediamine (HDA) via interfacial polymerization process for covalent immobilization of Pseudomonas fluorescens lipase (PFL). The maximum PFL loading of the synthesized support reaches 87.5 Mg-protein/g(support), and 864% activity recovery of PFMMs-G(3.0)PFL can be achieved at pH 9.0. Then, it was used to catalyze the resolution of (R,S)-1-phenylethanol with vinyl acetate. Under the optimized conditions, 50.0% conversion with 99.0% ee(s )can be reached within 1.5 h. In addition, a conversion of 49.2% and ee s of 96.9% can be retained after 10 batches of running, displaying an excellent operational stability. Importantly, a further investigation shows that the obviously improved reusability of the immobilized PFL is ascribed to the increased rigidity in comparison to fully flexible dendrimer. Thus, the newly constructed protocol for lipase immobilization exhibits a great prospect in biochemical engineering.
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