瑞氏木霉纤维素酶研究进展

瑞氏木霉(Trichoderma reesei)产生的纤维素酶酶系全、能分泌到细胞外,是研究得最清楚的产纤维素酶的模式菌株,但是其产生的纤维素酶还不能满足工业化转化纤维素的需要。本文从纤维素酶种类与调控、提高纤维素酶活的方法、标记基因的选择等方面概述瑞氏木霉纤维素酶,分析瑞氏木霉纤维酶研究面临的问题及对策,指出提高β?葡萄糖苷酶的产量和酶活是未来研究工作的重点之一。     

影响血清蛋白醋酸纤维薄膜电泳操作因素探讨

本文结合人体血清蛋白醋酸纤维薄膜电泳原理以及多年来在实验教学中的经验总结 ,对电泳实验操作中的主要环节作了分析探讨 ,找出影响蛋白质区带分离清晰的主要因素和解决方法 ,提高区带的分辨力和实验结果的准确性 ,充分体现醋酸纤维薄膜电泳在血清蛋白组成成份分析中应用的优越性     

棉纤维素在NMMO中溶解前后结晶结构的变化

采用X-光衍射和PEAKFIT分峰技术,对纤维素原料浆粕在NMMO·H_2O中溶解前后结晶变体的转化和结晶参数的变化进行了研究。结果表明,经本试验所采用的方法处理后,只能得到纤维素Ⅱ,而不能得到纤维素Ⅰ制品,且处理后的纤维素的结晶度、结晶指数和晶粒尺寸都有不同程度的下降。     

纤维素乙醇发展现状

在介绍纤维素乙醇的优点及其制取方法的基础上，综述了国内外纤维素乙醇的应用和产业化状况。提出了纤维乙醇产业化亟待解决的关键技术，及未来的研究方向和发展策略。     

A novel cellulose hydrogel prepared from its ionic liquid solution

A novel cellulose hydrogel is prepared by regenerating cellulose from its ionic liquid solution. The transparency cellulose hydrogel presents a good chemical stability and an acceptable mechanical property. This non-toxic cellulose hydrogel should be biocompatible and may be useful in the future as a biomaterial. Supported by the National Natural Science Foundation of China (Grant No. 20604017) and Scientific Research Foundation for the Returned Overseas Chinese Scholars, Ministry of Education of China     

Study on TEMPO-Mediated Selective Oxidation of Alkaline Natural Cellulose Pulp and Properties of Its Products

It has been reported that natural cellulose(celluloseⅠ) can not be oxidized by TEMPO - NaOCl -NaBr system, one of TEMPO-mediated selective oxidantsystems, but regenerated cellulose(cellulose Ⅰ)can becompletely selectively oxidized. In the present work,natural cellulose pulp was treated with NaOH solution,which concentration is lower than 20 wt%. The alkalinecelluloses obtained were oxidized by TEMPO - NaOCl -NaBr system and the factors which influence the selectiveoxidation reaction rate have been investigated. Thestructure of the oxidized products has been characterizedby Fourier transform-infrared(FTIR), nuclear magenaticresonace(NMR) and wide angle X-ray diffraction(WAXD) methods, and their adsorption properties forCu2 and Cd2 in aqueous solutions have beenpreliminarily examined. The results show that after thealkaline treatment, the primary hydroxyl at C6 position ofnatural cellulose can be selectively oxidized to carboxylgroup in the reaction medium at pH 10.8, the oxidationrate becomes greater with the NaOH concentration andalkaline treatment time increasing. The alkaline treatmenthas a great effect on the crystal structure of naturalcellulose, but the crystal structure of alkaline cellulosekeeps almost unchanged after oxidation. The adsorptioncapacity is enhanced by introducing carboxyl groups intothe cellulose macromolecular chains.     

淀粉黄原酸酯—天然橡胶胶乳粘合剂的研制

以淀粉黄原酸酯作为增强剂及填充剂，与天然橡胶胶乳等配合，制备出一种高性能，低成本的水性胶粘剂，该胶粘剂使用方便，无毒无嗅，特别适合于橡胶纤维编程管和缠绕管的加工生产等。     

The Structure Development of Cellulose Dissolved in the Phosphoric Acid/ Polyphosphoric Acid Solvent

Cdlulose,being as the most abundant nature polymer material and the most promising oil substitute,attracts more and more interests.A new cellulose dissolution system,phosphoric acid ( PA)/polyphosphori...     

天然型染发剂的研制

针对传统染发剂的毒性及刺激性,本文研制一种不含有毒铅,不含苯胺类致敏物,而含属于植物构分的有机化合物的天然型染发剂.     

Effects of Coagulation Conditions on Tensile Properties of Regenerated Cellulose Fibers

The effects of coagulation conditions on tensile properties of the regenerated cellulose fibers prepared by wet-spinning from NaOH/thiourea/urea(8∶6.5∶8 by weight)aqueous solvent were investigated by tensile tester,X-ray diffraction(XRD),and scanning electron microscope(SEM).The results show that the tensile properties of the as-spun fibers change with the coagualtion concentration,temperature,and time.When the spinning solution is coagulated in 10% H2SO4/12.5% Na2SO4 aqueous solution,the as-spun fibers hav...