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Effect of xylanases on peroxide bleachability of eucalypt (E. globulus) kraft pulp

Paper ID Volume ID Publish Year Pages File Format Full-Text
4456 227 2008 8 PDF Available
Title
Effect of xylanases on peroxide bleachability of eucalypt (E. globulus) kraft pulp
Abstract

Industrial eucalypt (E. globulus L.) kraft pulp was treated with two commercial xylanase preparations Ecopulp® TX-200A and Pulpzyme® HC (endo-1,4-β-xylanase activity; EC 3.2.1.8) and bleached by totally chlorine-free (TCF) three-stage hydrogen peroxide bleaching sequence, without oxygen pre-delignification. The effect of enzymatic stage on pulp properties and bleachability has been studied and compared with reference (control) pulps, processed without enzyme addition. The similar mode of enzymatic action was noted for both xylanase preparations. Final brightness of 86% ISO was achieved after complete bleaching. Direct bleaching effect caused pulp brightening (by 1.2–1.5% ISO) and delignification (by 7–10%) immediately after the enzymatic stage. The maximal bleach boosting was shown after the first peroxide stage and then diminished, despite the progressive increase in delignification over the control. The loss in efficiency of xylanase treatment by the end of peroxide bleaching was associated with specific behavior of xylan-derived chromophores, i.e., hexenuronic acids.

Keywords
Xylanase bleaching; Eucalypt kraft pulp; Biocatalysis; Enzymes; Enzyme biocatalysis; Enzyme technology
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Effect of xylanases on peroxide bleachability of eucalypt (E. globulus) kraft pulp
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 40, Issue 1, 15 May 2008, Pages 19–26
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