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pubmed-article:17333255pubmed:dateCreated2007-5-15lld:pubmed
pubmed-article:17333255pubmed:abstractTextThe mechanism of lignin carbohydrate complex formation by addition of polysaccharides on quinone methide (QM) generated during lignin polymerisation was investigated using a model approach. Dehydrogenation polymers (DHPs, lignin model compounds) were synthesized from coniferyl alcohol in the presence of a glucuronoarabinoxylan (GAX) extracted from oat spelts, by Zutropfverfahren (ZT) and Zulaufverfahren (ZL) methods. The methods ZT and ZL differed in their distribution of QM over the reaction period but generated roughly the same QM amount. Steric exclusion chromatography of the ZT and ZL reaction products showed that only the ZT reaction produced high molar mass compounds. Covalent linkages in the ZT reaction involving ether bonds between GAX moiety and alpha carbon of the lignin monomer were confirmed by (13)C NMR and xylanase-based fractionation. The underlying phenomena were further investigated by examining the interactions between GAX and DHP in sorption experiments. GAX and DHPs were shown to interact to form hydrophobic aggregates. In the ZT process, slow addition permitted polymer reorganisation which led to dehydration around the lignin-like growing chains thereby limiting the addition of water on the quinone methide formed during polymerisation and thus favoured lignin-carbohydrate complex (LCC) formation.lld:pubmed
pubmed-article:17333255pubmed:languageenglld:pubmed
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pubmed-article:17333255pubmed:statusMEDLINElld:pubmed
pubmed-article:17333255pubmed:monthJunlld:pubmed
pubmed-article:17333255pubmed:issn0032-0935lld:pubmed
pubmed-article:17333255pubmed:authorpubmed-author:Rondeau-Mouro...lld:pubmed
pubmed-article:17333255pubmed:authorpubmed-author:CathalaBernar...lld:pubmed
pubmed-article:17333255pubmed:authorpubmed-author:ChabbertBrigi...lld:pubmed
pubmed-article:17333255pubmed:authorpubmed-author:SaakeBodoBlld:pubmed
pubmed-article:17333255pubmed:authorpubmed-author:BarakatAbdell...lld:pubmed
pubmed-article:17333255pubmed:authorpubmed-author:WinterHeikoHlld:pubmed
pubmed-article:17333255pubmed:issnTypePrintlld:pubmed
pubmed-article:17333255pubmed:volume226lld:pubmed
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pubmed-article:17333255pubmed:pagination267-81lld:pubmed
pubmed-article:17333255pubmed:dateRevised2010-11-18lld:pubmed
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pubmed-article:17333255pubmed:year2007lld:pubmed
pubmed-article:17333255pubmed:articleTitleStudies of xylan interactions and cross-linking to synthetic lignins formed by bulk and end-wise polymerization: a model study of lignin carbohydrate complex formation.lld:pubmed
pubmed-article:17333255pubmed:affiliationUnité Mixte de Recherche Fractionnement des AgroRessources et Emballages, Institut National de la Recherche Agronomique, Equipe Parois et Matériaux Fibreux, 51686, Reims Cedex 2, France.lld:pubmed
pubmed-article:17333255pubmed:publicationTypeJournal Articlelld:pubmed