不同竹龄细叶龙竹的化学成分、显微结构分析及木质素结构表征

Chemical Composition Analysis, Microstructure Analysis and Isolated Lignin Structural Characterization of Dendrocalamus membranaceus cv. grandis at different growth-ages

关键词:  细叶龙竹  竹龄  显微结构  木质素结构  化学成分

Key Words:Dendrocalamus membranaceus cv. grandis  bamboo age  microstructure  structure of lignin  chemical composition analysis

摘要:本论文以三种竹龄细叶龙竹为对象，通过场发射扫描电子显微镜、凝胶渗透色谱法及二维核磁（2D NMR）等分析手段，研究了竹龄对细叶龙竹的化学成分、纤维形态、生物结构以及木质素结构等方面的影响。结果表明，随着竹龄增大，细叶龙竹纤维的平均长、宽度略有增加，但长宽比基本不变；维管束中纤维股的纤维细胞壁逐渐增厚；细叶龙竹的综纤维素、冷水及热水抽出物逐渐减少；酸不溶、酸溶木质素、总木质素含量及其苯醇抽出物含量呈增大趋势。不同竹龄细叶龙竹的分离木质素均为GSH型，木质素结构单元间的主要连接键方式为β?O?4醚键，随竹龄增加，S/G值增大，木质素的分子量增大，β?O?4醚键含量也在不断增大。

Abstract:In this study, the chemical composition, fiber morphology, biological structure and lignin structure of three kinds of bamboo were studied by field emission scanning electron microscopy, gel permeation chromatography and 2D nuclear magnetic resonance (NMR). The results showed that with the increase of bamboo age, the average length and width of bamboo fiber increased slightly, but the ratio of length-width remained unchanged. The fiber cell wall of the fiber strand in the bundle was thickened gradually. The hemicellulose, cold water and hot water extracted from the bamboo gradually decreased. Acid insoluble, acid soluble lignin, lignin content and benzenol extract content increased. The lignin of different bamboo ages is GSH type, and the main bonding mode between lignin structural units is β?O?4 ether bond. With the increase of bamboo age, the S/G value increases, the molecular weight of lignin increases, and the content of β?O?4 ether bond increases.