雷氏大疣蛛毒素-V的分离纯化与初步活性鉴定

雷氏大疣蛛(Macrothele raveni)是最近发现的异仿蛛科大疣蛛属的蜘蛛新种.雷氏大疣蛛毒素-V就是以该蜘蛛粗毒为原料,利用阴、阳离子交换层析和反相高效液相色谱分离纯化得到并命名的一种新型蜘蛛毒素.利用基质辅助激光解析电离飞行时间质谱仪分析得知它的相对分子质量为3133.48;通过初步活性研究证明雷氏大疣蛛毒素-V是一种昆虫专一性神经毒素.     

纤维素离子交换材料的研究进展

纤维素含有大量的羟基,可以通过醚化、胺化、磺化等化学反应对其进行衍生,从而制备出不同性能的纤维素离子交换材料。文章针对纤维素离子交换材料的特点,综述了近年来国内外以纤维素为原料制备纤维素离子交换材料及对水中重金属离子处理的研究进展。     

基于离子交换聚合物--金属复合结构的柔性致动器研究

Ion-exchange polymer-metal composite （IPMC） is a new electroactive material. It has large deformation and high force weight ratio in the presence of low voltage （〈1.5 V）. In this study a soft actuator known as artificial muscle based on IPMC was prepared. The IPMC actuator is composed of a perfluorinated ion-exchange membrane and platinum plated on both sides of the membrane by chemical means. Experiences and some key points are introduced in preparation of the IPMC. Electromechanical behaviors of the actuator are investigated, Factors related to the actuator performance are discussed.     

庆大霉素发酵液的分离提取

建立从发酵液中提取庆大霉素的方法,获得具有一定纯度的庆大霉素分析样品。采用732阳离子交换树脂,利用离子交换法从发酵液中提取庆大霉素,探讨不同条件对庆大霉素收率的影响。确定最优的提取条件为:发酵液pH2～3,吸附时间2 h,解吸剂浓度5%,解吸剂流速0.4 mL/min。经HPLC测定,发酵液通过离子交换法分离提取后,庆大霉素纯度由50.7%提高到92.5%。离子交换法适用于庆大霉素发酵液的分离提取,提取液纯度达到药物分析的要求。     

凝胶过滤及离子交换层折法纯化玉米CuZn—SOD的研究

用葡聚糖（Sephadex G－75）凝胶过滤及纤维素（DEAE－32）离子交换层析法分离纯化玉米CuZn－SOD,并对其部分理化性质进行了测定。结果表明，玉米CuZn－SOD具有怀其它来源的CuZn－SOD相似的性质，即最大吸收峰为260nm，分子量为33，600道尔顿，分子中含有17种289个氨基酸残基，不含色氨酸，N－末端氨基酸为丙氨酸，1分子酶中含2个铜原子和2个锌原子；电泳分析显示，蛋白质谱带和酶活性谱带数目相同，均为两条。     

弱碱性离子交换纤维的制备及机理研究

目的：以聚丙烯腈纤维为原料，制备弱碱性离子交换纤维。方法：采用先交联后胺化的两步法，以水合肼为交联剂、乙二胺为胺化剂制备，并进行红外、元素分析，初步探讨了反应的机理，研究了主要因素对反应的影响。结果：交换容量约为5．ommol．g-1~6．0mmol．g-1、机械性能良好。结论：制备方法可行，水合肼的浓度、反应温度、反应时间均有较显著的影响。     

Organic synthesis using clay catalysts

Conclusion The clay minerals can catalyze a variety of organic reactions occurring on their surface and interstitial space. Synthetic organic chemists have been attracted to their tremendous potential as catalysts only relatively recently. Modification of their properties by incorporating different metal cations, molecules or complexes, can lead to catalysts that are useful in effecting even more varieties of reactions and higher selectivity in product structure and yield. There is a theory that the molecules of life actually developed in sedimentary clays. As the organic chemist is becoming more aware of the clay’s efficacy, its uses in organic synthesis are bound to increase, especially because it helps in developing eco-friendly chemical processes. The dark clay has a bright future in the area of organic synthesis.