磨木木质素在硫酸盐法蒸煮过程中的降解及与木糖的缩合  

Degradation of Milled-wood Lignin and Its Condensation with Xylose during Kraft Cooking

作　　者：邵震宇[1] 谢益民[1] 周燕 杨志勇 

机构地区：[1]山东轻工业学院制浆造纸科学与技术教育部重点实验室,山东济南250353 [2]潍坊科技职业学院化学工程学院,山东寿光262700

出　　处：《林产化学与工业》2009年第1期29-32,共4页Chemistry and Industry of Forest Products

基　　金：国家自然科学基金(20674046);山东省优秀中青年科学家奖励基金(04BS05005)

摘　　要：在木糖存在的条件下,采用硫酸盐法蒸煮对蓝花楹磨木木质素(MWL)进行处理,然后对处理后的产物进行红外光谱和13CNMR分析,研究蓝花楹MWL的结构变化,探讨在硫酸盐法蒸煮过程中木质素-碳水化合物复合体(LCC)的形成情况。研究发现:蓝花楹MWL结构单元之间的α-烷基芳基醚键、β-O-4型连接键很容易发生断裂,而在这些连接键发生断裂的同时,形成的木质素中间体与木糖通过化学键的结合,形成新的LCC结构。这种新形成的LCC结构主要是由β-O-4型木质素结构和5-5′缩合型木质素结构与木糖形成的以苯甲醚键连接的LCC,这种新形成的LCC结构对碱非常稳定。Degradation and condensation of milled-wood lignin（MWL） from Jacaranda copaia Aubl. D. Don during kraft cooking in the presence of xylose was investigated. FT-IR and ^13C NMR were used to analyze the structure of the products from kraft cooking. The results indicated that lignin linkages were cleaved easily by kraft cooking, especially α-aryl ether linkages and β-O-4 linkages. New lignin-carbohydrate complexes （LCC） structures were found simultaneously during the breaking of lignin linkages. The newly formed LCC was originated from condensation between lignin intermediates and xylose, mainly from β-O-4 and 5-5′ lignin structures, which were connected with xylose through benzyl ether linkage. In addition, this newly formed LCC was very stable against alkali.

关 键 词：木质素-碳水化合物复合体 磨木木质素 木糖 硫酸盐法蒸煮 苯甲醚键 

分 类 号：TQ351.013[化学工程] TS711[轻工技术与工程—制浆造纸工程]