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Azo and anthraquinone dye decolorization in relation to its molecular structure using soluble Trichosanthes dioica peroxidase supplemented with redox mediator

Paper ID Volume ID Publish Year Pages File Format Full-Text
51994 46861 2011 6 PDF Available
Title
Azo and anthraquinone dye decolorization in relation to its molecular structure using soluble Trichosanthes dioica peroxidase supplemented with redox mediator
Abstract

In this study we investigated the decolorizing ability of Trichosanthes dioica-derived soluble peroxidase on structurally complex azo and anthraquinone dyes in the presence of redox mediators. Our results show that riboflavin acted as a better redox mediator than antraquinone-2, 6-disulfonate (AQDS). Riboflavin served as an efficient electron transferor than AQDS in the reduction of azo dyes, by contrast with anthraquinone dyes. Although the extent of decolorization (expressed as percent dye decolorization) varied from one dye to the other, maximum decolorization was achieved for the case when suspensions containing 0.45 EU (Enzyme Units)/ml and 0.2 mM riboflavin at pH 5.0 were incubated for 2 h at 40 °C.Redox mediator supplementation remarkably improved the decolorizing potential of T. dioica peroxidase. Azo dyes exhibited higher decolorization as compared to anthraquinone dyes in the presence of riboflavin. On the contrary, percent decolorization in the absence of redox mediators was inadequate and slow. Redox mediators studied herein facilitated decolorization of stable anthraquinone dyes. Therefore, the effect of redox mediators on T. dioica peroxidase-dye decolorization is affected by stability, thus the molecular structure.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights► Riboflavin enhances decolorization of azo and anthraquinone dyes more than AQDS. ► Anthraquinone dyes decolorized at higher concentrations of redox mediators. ► Cleavage of chromophore for azo dyes is favorable as compared to anthraquinone. ► Redox mediated dye decolorization is related to the dye molecular structure.

Keywords
Synthetic dyes; Decolorization; Peroxidases; Riboflavin; AQDS
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Azo and anthraquinone dye decolorization in relation to its molecular structure using soluble Trichosanthes dioica peroxidase supplemented with redox mediator
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 12, Issue 13, 26 July 2011, Pages 1218–1223
Authors
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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