细胞壁多糖与DHP间苯甲酯键的高效形成及纸页的增强

项目名称： 细胞壁多糖与DHP间苯甲酯键的高效形成及纸页的增强

项目编号： No.31300494

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 农业科学

项目作者： 王鹏

作者单位： 湖北工业大学

项目金额： 24万元

中文摘要： 纸张纤维间的氢键具有键能低和容易被水分子所破坏的特点，大大限制了纸张的应用范围。传统的纸张生产过程中由于采用三聚氰胺-甲醛树脂等胶黏剂而引起甲醛污染。近年来人们采用漆酶等木素氧化酶对纤维改性来提高纤维间结合强度，但是，该方法仍难以大幅度提高纸张强度。本研究拟模拟植物体内木素-碳水化合物复合体（LCC）结构中苯甲酯键的生物合成过程，采用TEMPO/NaClO/NaBr氧化体系对纸浆纤维进行选择性氧化，在纤维表面导入适量的羧基，然后在漆酶/β-葡萄糖苷酶/O2构成的木素氧化酶体系作用下，由木素前驱物松柏醇葡萄糖苷生成的脱氢聚合物DHP与纸浆纤维上的羧基高效生成苯甲酯键，使得已经分离的纤维之间通过苯甲酯键连接起来，纤维间形成牢固的共价键交联，大幅度提高纤维之间的结合强度，在此基础上研制出具有高干强度和湿强度的纸张，为环保型纸张的研究和开发提供新方法、新理论。

中文关键词： pH值；脱氢聚合物；苯甲酯键；纸张；湿强度

英文摘要： Hydrogen bonds between paper fibers ，whose bond energy is low, are damaged easily by water molecules. The characteristics of hydrogen bonds greatly limits the range of applications of paper. Formaldehyde pollution will occur when the formaldehyde-containing adhesives such as melamine-formaldehyde are applied in tne manufacture of conventional paper. Recently, lignin oxidases such as laccase have been used to modify the fibers to improve paper strenth. However,it is still difficult to increase paper strength significantly with this method. In this work, the process of biosynthesis of benzyl ester bonds in the structure of lignin-carbohydrate complexes(LCC) will be simulated. Paper fiber will be selectively oxidized with TEMPO/NaClO/NaBr mediated oxidation system in order to increase content of carboxyl groups in carbohydrate fractions. Then, benzyl ester bonds are formed between carboxyl group on the surface of fibers and DHP (Dehydrogenation Polymer, DHP) derived from coniferin in the presence of a mixture containing laccase,β-glucosidase,O2 so that bonding strength among fibers will be greatly improved. On the basis, paper with excellent dry and wet strength will be prepared. This research will provide a new method and a new theory for the research and development of environment-friendly paper.

英文关键词： pH value；Dehydrogenation Polymer；Benzyl ester bond；Paper；Wet strength