Document Detail

Influence of the hexenuronic acid content on refining and ageing in eucalyptus TCF pulp.
MedLine Citation:
PMID:  20074936     Owner:  NLM     Status:  MEDLINE    
Brightness in totally chlorine-free (TCF) pulp is more unstable than it is in elemental chlorine-free (ECF) pulp, seemingly by effect of the former containing greater amounts of oxidizable structures such as hexenuronic acids (HexA). Accelerated ageing tests involving the application of moist heat to pulp revealed that brightness reversion can be alleviated by using an effective biotechnological method involving an enzyme-mediator treatment. Thus, the joint use of laccase from Trametes villosa and the mediator hydroxybenzotrialoze (HBT) in TCF pulp removes hexenuronic acids by 23% and reduces brightness reversion by 8.4%. Additional tests conducted to assess the effect of HexA on pulp refining revealed that these oxidizable structures introduce hydrophilicity in the pulp. Removing hexenuronic acids from TCF pulp alters its refining outcome as regards drainability ( degrees SR) and water retention capacity (%WRV); also, it leads to paper with comparable strength-related properties which requires no additional refining energy.
Edith M Cadena; Teresa Vidal; Antonio L Torres
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-01-13
Journal Detail:
Title:  Bioresource technology     Volume:  101     ISSN:  1873-2976     ISO Abbreviation:  Bioresour. Technol.     Publication Date:  2010 May 
Date Detail:
Created Date:  2010-02-17     Completed Date:  2010-05-14     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9889523     Medline TA:  Bioresour Technol     Country:  England    
Other Details:
Languages:  eng     Pagination:  3554-60     Citation Subset:  IM    
Copyright Information:
Copyright 2009 Elsevier Ltd. All rights reserved.
Textile and Paper Engineering Department, ETSEIAT, Universitat Polit?cnica de Catalunya, Colom 11, E-08222 Terrassa, Spain.
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MeSH Terms
Eucalyptus / chemistry*
Hexuronic Acids / analysis*
Trametes / enzymology
Reg. No./Substance:
0/Hexuronic Acids; 0/hexenuronic acid

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