Structural Characterization of Lignin Isolated from Wheat-Straw during the Alkali Cooking Process

BioResources

Jinpeng Li¹  Bing Wang¹  Bin Wang²  Kefu Chen³  Xiaojun Tian³ 

[1] China;Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing, 100083, China;Plant Micro/Nano Fiber Research Center, State Key Laboratory of Pulp and Paper Engineering, School of Light Industry and Engineering, South China University of Technology, Guangzhou 516640, China;

关键词: Alkali cooking;    Lignin;    Structural characterization;    Wheat-straw;   

DOI  :  10.15376/biores.12.2.2407-2420

来源: DOAJ

【 摘 要 】

To investigate the behavior of lignin during the alkali cooking process with different alkali doses, this work demonstrated the structural characteristics illustrated by spectroscopic analyses. Gel permutation chromatography (GPC) and nuclear magnetic resonance (NMR) indicated that the lignin was composed of typical structures for a grass, generally with S and G units and small amounts of H units. The main substructures present were β-O-4 aryl ether linkages, and there were lower amounts of β-β and β-5 linkages. Alkali treatment conditions had evident effects on the chemical structures and properties of lignin. Moreover, NMR indicated that alkali cooking caused lignin to depolymerize more easily with increasing severity and to condense.

【 授权许可】

Unknown