Document Detail

The unmasking of lignin structures in wheat straw by alkali.
MedLine Citation:
PMID:  12809724     Owner:  NLM     Status:  MEDLINE    
This study reports on the structural modifications of wheat straw cell wall promoted by potassium carbonate and sodium hydroxide that lead to the unmasking of some lignin structures. The first impact of the treatments was the extraction of a particular fraction of lignin enriched in C-C linked structures compared to the mean composition in reference wheat straw. Concomitantly, an apparent increase in the amount of lignin monomers released by the cleavage of alkyl-aryl ether bonds was observed in alkali-extracted samples. By summing the amount of ether linked monomers analyzed by thioacidolysis in the solubilized lignin to that found in the extracted wheat straw, an excess of up to 37% is apparent, relative to the corresponding amount in the reference wheat straw. Other modifications of the cell wall were also found. Indeed, a fraction of uronic acids was lost during the treatments and a new fractionation pattern of the lignin-carbohydrate complexes was evidenced. It can thus be concluded that a significant proportion of lignin within the cell wall was unmasked after (i) the selective removal of a particular lignin fraction, (ii) a partial saponification of the esterified fraction of lignin with uronic acids and (iii) a modification of the interactions between the cell wall constituents.
Nathalie Durot; François Gaudard; Bernard Kurek
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Phytochemistry     Volume:  63     ISSN:  0031-9422     ISO Abbreviation:  Phytochemistry     Publication Date:  2003 Jul 
Date Detail:
Created Date:  2003-06-17     Completed Date:  2003-09-16     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0151434     Medline TA:  Phytochemistry     Country:  United States    
Other Details:
Languages:  eng     Pagination:  617-23     Citation Subset:  IM    
Equipe Parois Végétales et Matériaux Fibreux, UMR de Fractionnement des Agroressources et Emballages, Institut National de la Recherche Agronomique (INRA), 2 Esplanade Roland Garros, F-51686 Reims Cedex 2, France.
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MeSH Terms
Cell Wall / chemistry*
Lignin / chemistry*,  isolation & purification*
Plant Stems / chemistry
Sodium Hydroxide
Triticum / chemistry*
Reg. No./Substance:
0/Carbonates; 1310-73-2/Sodium Hydroxide; 584-08-7/potassium carbonate; 7440-09-7/Potassium; 9005-53-2/Lignin

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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