期刊
ACS OMEGA
卷 6, 期 3, 页码 2143-2148出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.0c05225
关键词
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资金
- UAE University and Institutions of Asian Universities Alliance (AUA) (UAEU-AUA Fund) [31R167]
- China-Latin America Joint Laboratory for Clean Energy and Climate Change [KY201501004]
- Dongguan Science & Technology Bureau (Innovative R&D Team Leadership of Dongguan City) [201536000100033]
The immobilization of Aspergillus niger lipase on macroporous zeolitic imidazolate frameworks (M-ZIF-8) showed higher enzymatic activity, thermal stability, and reusability compared to conventional ZIF-8. Moreover, using ANL@M-ZIF-8 for biodiesel production led to a higher fatty acid methyl ester yield.
Immobilization of enzyme on metal-organic frameworks (MOFs) has drawn increasing interest owing to their many well-recognized characteristics. However, the pore sizes of MOFs (mostly micropores and mesopores) limit their application for enzyme immobilization to a great extent owing to the large size of enzyme molecules. Synthesis of MOFs with macropores would therefore solve this problem, typically encountered with conventional MOFs. In this work, macroporous zeolitic imidazolate frameworks (ZIF-8), referred to as M-ZIF-8, were synthesized and used for immobilization of Aspergillus niger lipase (ANL). Immobilization efficiency using M-ZIF-8 and enzymatic catalytic performance for biodiesel preparation were investigated. The immobilized ANL on M-ZIF-8 (ANL@M-ZIF-8) showed higher enzymatic activity (6.5-fold), activity recovery (3.8-fold), thermal stability (1.4- and 3.4-fold at 80 and 100 degrees C, respectively), reusability (after five cycles, 68% of initial activity was maintained), and porosity than ANL on conventional ZIF-8 (ANL/ZIF-8). In addition, by using ANL@M-ZIF-8 for catalyzing a biodiesel production reaction, a higher fatty acid methyl ester yield was achieved.
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