Studies of xylan interactions and cross-linking to synthetic lignins formed by bulk and end-wise polymerization: a model study of lignin carbohydrate complex formation

被引:46
作者
Barakat, Abdellatif
Winter, Heiko
Rondeau-Mouro, Corinne
Saake, Bodo
Chabbert, Brigitte
Cathala, Bernard
机构
[1] INRA, Unite Biopolymeres Interact & Assemblages, F-44316 Nantes 3, France
[2] INRA, Unite Mixte Rech Fractionnement AgroRessources, Equipe Parois & Mat Fibreux, F-51686 Reims 2, France
[3] Fed Res Ctr Forestry & Forest Prod, Inst Wood Chem & Chem Technol Wood, D-21031 Hamburg, Germany
关键词
aggregation; carbohydrate complex; dehydrogenation polymers (DHP); glucuronoarabinoxylan; lignin;
D O I
10.1007/s00425-007-0479-1
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
The 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 C-13 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.
引用
收藏
页码:267 / 281
页数:15
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