广西10种野生竹材的化学组分分析及木质素结构表征

Chemical Composition Analysis and Isolated Lignin Structural Characterization of 10 Wild Bamboo Species in Guangxi

关键词:  野生竹材  木质素  结构表征  化学成分分析

Key Words:wild bamboo  lignin  structural characterization  chemical composition analysis

摘要:本研究采用NREL法、硫醇酸解法、凝胶渗透色谱法（GPC）以及二维核磁（2D NMR）等分析检测手段对广西10种野生竹材纤维原料的化学成分与分离木质素的结构进行了表征。结果表明，10种野生竹材的纤维素含量为37.09%~44.21%，半纤维素含量为17.16%~23.32%，木质素含量为21.73%~25.81%；所有竹材分离木质素均为GSH型，基本结构单元均以S型和G型为主，H型结构单元含量均不高于5%；木质素结构单元间的主要连接键方式为β-O-4、β-β与β-5，其中β-O-4含量占主要侧链连接的80%以上、占总芳环总量的47.41%~52.07%；此外，木质素中还存在与阿魏酸和对香豆酸的酯键连接。综合分析，撑篙竹在10种竹材中最适合用于生物质精炼、木质素降解以及制浆造纸等领域的开发利用，耳垂竹、大绿竹次之。

Abstract:In this study， the chemical composition and isolated lignin structure of 10 wild bamboo raw materials from Guangxi province were characterized by the National Renewable Energy Laboratory （NREL） method， thioacidolysis， gel permeation chromatography （GPC）， two-dimensional nuclear magnetic （2D NMR）， etc. The results showed that the cellulose contents of 10 wild bamboo species were between 37.09%~44.21%， and the hemicellulose and lignin contents were 17.16%~23.32% and 21.73%~25.81%， respectively. All lignin preparations were GSH-type， and the content of the H-type unit was below 5%. Three major inter-unit linkages present in all kinds of bamboo’s lignin are β-O-4， β-β， and β-5， of which the β-O-4 linkages accounted for more than 80% of the main side-chain linkages and accounted for 47.41%~52.07% of the total aromatics.In addition， ferulic acid and p-coumarin acid were also found in the aromatic region. In summary， it suggested that the Bambusapervariabilis， among these bamboo samples，was the most suitable type of bamboo to be used in biorefinery， lignin degradation， and pulping and papermaking， followed by the Schizostachyumauriculatum and Dendrocalamopsis.