MOLECULAR VARIABILITY OF LIGNIN FRACTIONS-ISOLATED FROM WHEAT-STRAW

被引：28
作者：
BILLA, E
MONTIES, B
机构：
[1] Laboratoire de Chimie Biologique, INRA, Institut National Agronomique Paris-Grignon, Thivervalgrignon
来源：
RESEARCH ON CHEMICAL INTERMEDIATES | 1995年 / 21卷 / 3-5期
关键词：
D O I：
10.1007/BF03052260
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Three lignin fractions were isolated from wheat straw internodes and leaves: alkali lignin (LA), milled lignin (LM) and enzyme lignin (LE). Thioacidolysis and alkaline nitrobenzene oxidation were used for the characterisation of the lignin monomeric composition. Esterified and etherified p-coumaric and ferulic acids were characterised by alkali hydrolysis and acidolysis, respectively. Lignin fractions from leaves are more condensed than those from internodes. The syringyl/guaiacyl (S/G) ratio is higher in the case of internode lignins. Among the three lignin fractions, LA is the less condensed whereas LM and LE do not present significant structural differences according to their monomeric composition. Finally, the lignin fractions studied differ in their contents and proportions of associated phenolic acids.
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页码：303 / 311
页数：9
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