中文摘要：

巨龙竹属禾本科竹亚科牡竹属竹种,是世界上已知最粗大的巨型丛生竹种,具有极高的开发利用价值。本研究采用碱性过氧化氢预处理结合碱抽提的方法提取巨龙竹秆材中的木质素,通过核磁共振、红外光谱以及热稳定性分析等方法,对所得的木质素样品进行了结构表征与解析。结果表明：巨龙竹木质素是典型的禾草类（HGS型）木质素,其大分子结构由对羟基苯丙烷单元、愈创木基单元和紫丁香基单元构成;木质素的结构中的联接结构以β-O-4＇联接键居多,β-β＇和β-5＇联接键较少;巨龙竹木质素有部分在侧链的γ位上与对香豆酸发生酯化反应,形成稳定的对香豆酸酯结构;本研究分离得到的3个巨龙竹木质素样品起始分解温度分别为194.8、195.4、197.9℃,热稳定性良好。

英文摘要：

Dendrocalamus sinicus, belonging to Dendrocalamus in Bambusoideae of Gramineae, has great development potential and research value, is known as the largest bamboo species of the world. In order to effectively separate lignin form D. sinicus and analyze the chemical structure more systematically, three lignin fractions （ L1 , L2, L3 ） were isolated with alkaline H202 solution and alkaline aqueous solution. The structure and properties of the lignin fractions were characterized by nuclear magnetic resonance （NMR）, Fourier transform infrared spectroscopy （FT-IR）, and thermogravimetry （TG）. The results indicated that the lignin isolated from D. sinicus is representative HGS lignin, and the macromolecular structure consists of p-hydroxylphenyl units, guaiacyl units and syringyl units. In the structure of the lignin,β-O- 4＇ linkages side-chain are in the majority ,β-β＇ was found to be esterfied linkages andβ-5＇ linkages by p-coumaric acid at the are less. Besides, the lignin T-carbon, and form stable p-coumarate structures. In addition, the isolated bamboo lignin fractions have good thermal stability,and the temperatures of initial decomposition are 194. 8,195.4 and 197.9 ℃, respectively.