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Bleaching of kraft pulp by a commercial lipase: Accessory enzymes degrade hexenuronic acids

Paper ID Volume ID Publish Year Pages File Format Full-Text
17734 42692 2008 7 PDF Available
Title
Bleaching of kraft pulp by a commercial lipase: Accessory enzymes degrade hexenuronic acids
Abstract

The potential of a commercial lipase for bleaching kraft pulp was investigated. Enzymatic treatment of hardwood and softwood kraft pulps before and after oxygen delignification resulted in a significant reduction of kappa number and hexenuronic acid content. Pretreatment of unbleached hardwood kraft pulp followed by a DE bleaching sequence gave the same kappa number as a control sequence but with considerably less chlorine dioxide. Two enzyme fractions containing high accessory enzyme activities were purified by size exclusion chromatography. These fractions demonstrated a high bleaching efficiency as well as a high selectivity, with a significant reduction in sugar released in the filtrate compared to commercial xylanase bleaching. This work provides the first evidence that the accessory enzymes from a commercial enzyme preparation can degrade hexenuronic acids and bleach kraft pulp.

Keywords
Biobleaching; Accessory enzymes; Hexenuronic acids; Kraft pulp
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Publisher
Database: Elsevier - ScienceDirect
Journal: Enzyme and Microbial Technology - Volume 43, Issue 2, 5 August 2008, Pages 130–136
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