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Potential and limitation of Trametes versicolor laccase on biodegradation of Eucalyptus globulus and Pinus pinaster kraft pulp

Paper ID Volume ID Publish Year Pages File Format Full-Text
17736 42692 2008 5 PDF Available
Title
Potential and limitation of Trametes versicolor laccase on biodegradation of Eucalyptus globulus and Pinus pinaster kraft pulp
Abstract

Two Eucalyptus globulus and one Pinus pinaster kraft pulps were submitted to laccase-mediator system (LMS) to evaluate the effect of the treatment on biodelignification and subsequently on hexenuronic acid content (HexA). As expected, the hexenuronic acid content of unbleached E. globulus kraft pulps is substantially higher than the corresponding values for unbleached P. pinaster pulp. Besides, the two unbleached E. globulus pulps revealed different HexA content, having an important effect the raw material. The amount of HexA is quite high in the unbleached clone E. globulus (64.1 mmol/kg), while it is moderately high in the industrial E. globulus kraft pulps (52.1 mmol/kg). These values represent between 29.1 and 38.5% of kappa number of these pulps. For unbleached P. pinaster kraft pulps, the contribution of hexenuronic acid to the pulp kappa number was considerably lower. The three unbleached pulps were submitted to an optimized laccase-violuric acid treatment and the results have shown that the delignification extent for hardwood and softwood were different, but also different for the same species. For E. globulus, it was observed that 49.3% of kappa number has reduced for the clone eucalypt, while 42.2% of kappa number reduction was observed for the industrial eucalypt pulp, with the same laccase-mediator system conditions. On the other hand, laccase-mediator system removes 35.9% of the initial kappa number of the unbleached softwood pulp. From the standpoint of the low delignification extent, the amount of lignin removed was almost twice. The effect of laccase-mediator system is mostly on lignin and the hexenuronic acid decrease slightly in the pulps.

Keywords
Eucalyptus globulus (clone); Pinus pinaster; Kraft pulp; Laccase; Violuric acid
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Potential and limitation of Trametes versicolor laccase on biodegradation of Eucalyptus globulus and Pinus pinaster kraft pulp
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Publisher
Database: Elsevier - ScienceDirect
Journal: Enzyme and Microbial Technology - Volume 43, Issue 2, 5 August 2008, Pages 144–148
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