巨龙竹有机溶剂木质素提取及结构表征

Isolation and Structural Characterization of Organosolv Lignin from Dendrocalamus sinicus

为表征巨龙竹木质素化学结构,在温和条件下连续采用二氧六环和二甲基亚砜抽提竹材原料,得到竹材木质素组分。红外光谱、凝胶色谱和核磁共振分析结果表明,巨龙竹木质素属于典型的禾草类木质素,其大分子由对羟基苯丙烷(H)、愈创木基丙烷(G)和紫丁香基丙烷(S)三种基本结构单元组成;巨龙竹木质素大分子的主要联接键为β-O-4'醚键、β-β'和β-5'碳-碳键;在巨龙竹木质素大分子中,苯丙烷结构单元侧链γ位碳与对香豆酸存在化学键联接,形成对香豆酸酯。

Bamboo lignin polymer was isolated from Dendrocalamus sinicus with dioxane and DMSO under mild conditions, and its＇structural properties was characterized with Fourier transform infrared spectroscopy （ FTIR）, gel permeation chromatography （ GPC ） , and nuclear magnetic resonance spectrum.The results indicated that the bamboo lignin belonged to grass lignin , consisting syringl （ S ） , guaiacyl （ G ） , and p-hydroxylphengl （ H ） units.The major interunit linkages presented in the obtained bamboo lignin were β-O-4＇aryl ether linkages ,β-β＇andβ-5＇C-C linkages.In addition, a small percentage of the lignin side-chain was found to be esterfied by p-coumaric acid at the γ-carbon.