Document Detail

Oxidation of spruce wood sawdust by MnO(2) plus oxalate: a biochemical investigation.
MedLine Citation:
PMID:  10898665     Owner:  NLM     Status:  MEDLINE    
This paper reports the modification/degradation of lignin within spruce sawdust by manganese complexes formed by the association of MnO(2) and oxalate. The Mn oxidants formed are shown to modify both the chemical and physical properties of the wood cell wall. Scanning electron microscopy analysis of oxidized tracheids revealed a smoothing of the cell wall surface from the lumen side due to the removal of some material. Thioacidolysis analysis of the oxidized lignin showed reductions of up to 30% in the recovery of ether-linked guaiacyl monomers and up to 45% for the some dimers composing the polymer. The MnO(2)/oxalate system also slightly modified polysaccharides, corresponding to a 10% loss in weight of arabinose and glucose in the oxidized sample. However, no delignification occurred, according to the acid insoluble lignin content of spruce. Oxalic acid at pH 2.5 did not induce detectable changes in the chemical structures of the lignin or of the polysaccharides.
B Kurek; F Gaudard
Related Documents :
21929855 - Raman microscopy-based cytochemical investigations of potential niche-forming inhomogen...
16277425 - Cell wall fractions isolated from outer layers of rye grain by sequential treatment wit...
3994675 - Structural studies of a mannitol teichoic acid from the cell wall of bacterium n.c.t.c....
6667475 - Hydrolytic release, and identification by g.l.c.-m.s., of 3-deoxy-d-manno-2-octulosonic...
21134325 - Free acid gel form of β-hydroxy-β-methylbutyrate (hmb) improves hmb clearance from pl...
3788665 - Artificial liver support for postoperative hepatic failure with anion exchange resin (b...
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of agricultural and food chemistry     Volume:  48     ISSN:  0021-8561     ISO Abbreviation:  J. Agric. Food Chem.     Publication Date:  2000 Jul 
Date Detail:
Created Date:  2000-10-06     Completed Date:  2000-10-06     Revised Date:  2000-12-18    
Medline Journal Info:
Nlm Unique ID:  0374755     Medline TA:  J Agric Food Chem     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  3058-62     Citation Subset:  IM    
Institut National de la Recherche Agronomique (INRA), Unité de Physicochimie et Biotechnologie des Polymères (UPBP), équipe de Biochimie des Macromolécules Végétales, 2 esplanade Roland Garros, 51686 Reims Cedex 2, France.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Manganese Compounds / metabolism*
Microscopy, Electron, Scanning
Models, Chemical
Oxalic Acid / metabolism*
Oxides / metabolism*
Reg. No./Substance:
0/Manganese Compounds; 0/Oxides; 1313-13-9/manganese dioxide; 144-62-7/Oxalic Acid

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

Previous Document:  Cloning and expression of an acidic pectin methylesterase from jelly fig (Ficus awkeotsang).
Next Document:  In vitro and in vivo activities of SCH 56592 (posaconazole), a new triazole antifungal agent, agains...