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Elucidating the effects of laccase-modifying compounds treatments on bast and core fibres in flax pulp.
MedLine Citation:
PMID:  21809327     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Laccases in combination with various chemical compounds have been tested with a view to obtain environmental friendly, high-value paper products from unbleached flax pulp, which is currently being assessed as a raw material for biotechnological innovation. With the aim of better understanding the effects of violuric acid (VA) and p-coumaric acid (PCA) on flax pulp, changes in the chemical composition of the two major fibre types it contains were assessed. Following classification, the initial pulp was split into two fractions according to fibre size, namely: bast (long) fibres and core (short) fibres. Fibre size was found to significantly influence the properties of pulp and it response to various laccase treatments. The laccase-PCA treatment substantially increased kappa number (KN) and colour in both fibre fractions, which suggests grafting of the phenolic compound onto fibres. On the other hand, the laccase-VA treatment produced long fibres with a low lignin content (KN = 1.3) and a high brightness (5 percent points higher than for the control fraction), which testifies to its bleaching efficiency. Both biotreatments produced long fibres containing highly crystalline cellulose and caused HexA removal from global and short fibres. On the other hand, the laccase treatments caused no morphological changes in the fibres, the integrity of which was largely preserved. As shown here, laccase acts as polymerization agent with PCA and as delignification agent with VA; also, the two enzymes systems act differently on bast and core fibres. Biotechnol. Bioeng. © 2011 Wiley Periodicals, Inc.
Authors:
Amanda Fillat; M Blanca Roncero; Teresa Vidal
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-8-1
Journal Detail:
Title:  Biotechnology and bioengineering     Volume:  -     ISSN:  1097-0290     ISO Abbreviation:  -     Publication Date:  2011 Aug 
Date Detail:
Created Date:  2011-8-2     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7502021     Medline TA:  Biotechnol Bioeng     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011 Wiley Periodicals, Inc.
Affiliation:
Textile and Paper Engineering Department. ETSEIAT. Universitat Politècnica de Catalunya. Colom 11. E-08222 Terrassa, Spain.
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