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The synergistic action of ligninolytic enzymes (MnP and Laccase) and Fe3+-reducing activity from white-rot fungi for degradation of Azure B

Paper ID Volume ID Publish Year Pages File Format Full-Text
18598 42727 2007 6 PDF Available
Title
The synergistic action of ligninolytic enzymes (MnP and Laccase) and Fe3+-reducing activity from white-rot fungi for degradation of Azure B
Abstract

The knowledge of the oxidative mechanisms displayed by white-rot fungi for lignin biodegradation is important to assess the complete potential application of their lignin-degrading metabolites, as the biodegradation of several pollutants by these fungi has been directly correlated to their capability to degrade lignin. In this context, to obtain better knowledge of their oxidative systems, we studied the synergistic action between Fe3+-reducing activity (FeRA) and the lignin-degrading enzymes MnP and laccase for degradation of the nonphenolic dye Azure B. Degradation of the dye was studied using low molecular weight fractions (<5 kDa) with FeRA (LMWFFRA) and high molecular weight fractions (>5 kDa) with MnP (HMWFMnP) and laccase (HMWFLac) activities isolated from white-rot fungi cultures. Significant Azure B degradation was only observed when it was previously treated with LMWFFRA in the presence of Fenton's reagent (iron and hydrogen peroxide) followed by treatment with HMWFLac or HMWFMnP. OH was evidenced as the main radical oxygen specie formed in the reaction mixtures and showed to be crucial for dye decolorization. In addition, the synergistic action between FeRA/Fe3+/H2O2 (as Fenton-based OH-producing reactions) and the lignin-degrading enzymes MnP and laccase, and also the relevance of this synergism as an oxidative pathway for lignin biodegradation by white-rot fungi and for bioremediation processes are discussed.

Keywords
Azure B; Fe3+-reducing activity; Laccase; Manganese-peroxidase; White-rot fungi; Fenton reaction
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The synergistic action of ligninolytic enzymes (MnP and Laccase) and Fe3+-reducing activity from white-rot fungi for degradation of Azure B
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Publisher
Database: Elsevier - ScienceDirect
Journal: Enzyme and Microbial Technology - Volume 42, Issue 1, 3 December 2007, Pages 17–22
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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