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Highly efficient synthesis of aldehydes by layer by layer multi-walled carbon nanotubes (MWCNTs) laccase mediator systems

Paper ID Volume ID Publish Year Pages File Format Full-Text
39188 45812 2015 12 PDF Available
Title
Highly efficient synthesis of aldehydes by layer by layer multi-walled carbon nanotubes (MWCNTs) laccase mediator systems
Abstract

•Laccase was stabilized on carbon nanotubes by the layer by layer (LbL) procedure.•New catalysts oxidized alcohols to aldehydes in the presence of redox mediators.•Analytical techniques confirmed the immobilization of the enzyme.•Quantitative conversion of substrates and yield of products were obtained.•Catalysts were used for more runs retaining their activity.

Laccase from Trametes versicolor was immobilized on multi-walled carbon nanotubes MWCNTs) applying two different strategies based on the layer by layer (LbL) procedure: (i) the direct adsorption on pristine MWCNTs followed by coating with PDDA and a second layer of enzyme (catalyst II), and (ii) the adsorption on modified MWCNTs and PDDA (catalyst III). The new catalysts were characterized by microscopy (SEM, AFM and HRTEM) and electrochemical (cyclic voltammograms) analyses, confirming the deposition of enzyme and polyelectrolyte layers, and the role of polyelectrolyte to enhance the electron transfer rate. Kinetic, storage and reusability data showed a good activity and higher stability than the system obtained by simple deposition of laccase on MWCNTs (catalyst I). Catalysts I–III were applied in the selective and efficient synthesis of aldehydes in the presence of redox mediators (TEMPO and ABTS). Catalyst II and TEMPO were more active (quantitative conversion of substrate and yield of product) and selective than catalysts I and III, and native laccase. The better performance of catalyst II with respect to catalyst III might be reasonably explained by the highest dispersion of laccase and by the presence of a double layer of enzyme. Catalysts II–III showed a higher activity than, or comparable to, that of most of the immobilized systems previously studied.

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Keywords
Laccases; Carbon nanotubes; Redox mediators; Heterogeneous catalysis; Synthesis of aldehydes
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Highly efficient synthesis of aldehydes by layer by layer multi-walled carbon nanotubes (MWCNTs) laccase mediator systems
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 499, 25 June 2015, Pages 77–88
Authors
, , , , , , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us