Journal
CHEMCATCHEM
Volume 10, Issue 23, Pages 5425-5433Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.201801293
Keywords
Enzyme activity; Laccase; Lipase; Voltammetry; Zeolite imidazolate framework
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Funding
- FIR 2018
- Fondazione di Sardegna/Regione Autonoma della Sardegna [CUP F72F16003070002]
- FFABR 2017 (MIUR)
- Alzahra University
- Agenzia delle Dogane e dei Monopoli (Italy)
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Lipase (Pseudomonas fluorescens) and laccase (Trametates versicolor) were encapsulated on two zeolite imidazolate framework, ZIF-8 and ZIF-zni, materials using a one-pot synthesis-immobilization method in aqueous solution at room temperature. The synthesized immobilized biocatalysts (Lip@-ZIF-8, Lip@ZIF-zni, Lac@ZIF-8, and Lac@ZIF-zni) were characterized by X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, and thermogravimetric analysis. The enzymatic activities of the four immobilized biocatalysts were characterized via the electrochemical detection of the substrates, p-nitrophenyl butyrate and 2,2-azinobis-3-ethylbenzthiazoline-6-sulfonic acid. For Lip@ZIF-8 the specific activity was 91.9Umg(-1) and 123.1Umg(-1) for Lip@ZIF-zni, while for Lac@ZIF-8 and Lac@ZIF-zni, the activity was 51Umg(-1) and 163Umg(-1), respectively, confirming that laccase retains a higher level of activity when immobilized onto ZIF-zni than on ZIF-8. Lac@ZIF-8 was the most stable system on storage (15days at 5 degrees C), retaining 94% of initial activity, while Lip@ZIF-zni biocatalyst had the optimal level of reusability, retaining 40% of initial activity after five reaction cycles.
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