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| β-cyclodextrin (β-CD), a cyclic oligosaccharide composed of seven glucose molecules with -1,4-glucosidase linkages, is produced from amylose by cyclodextrin glucosyltransferase from Bacillus, which has a micro-environment of a chiral, hydrophilic outside and a hydrophobic interior cavity (Szejtli, 1998; Dell Valle, 2004). Previous studies have focused on the use of theβ-CD structure in forming inclusion compounds that are mainly used for organic compound adsorption and applications in fields dealing with environmental protection, cosmetics, slow-release drugs, and so on (Banerjee & Chen, 2010; Cobos, Martinez Perez, Monreal Romero, & Garcia Casillas, 2007; Guo & Jiang, 2007). β-CD is biodegradable and contains a number of alcoholic hydroxyl groups for chemical reactions such as etherification, esterification, oxidation, cross-linking, and so on (Dell Valle, 2004). β-CD is suitable as starting material for the synthesis of SAP due to the abundant hydrophilic hydroxyl group. However, the molecular weight of β- CD is low. In order to increase molecular weight of the product, hydrophilic monomer could be link with β-CD by chemical crosslinking reactions. Meanwhile, the cyclic oligosaccharide chemical structure of β-CD could increase three-dimensional network structure of product in cross-linking reactions, favoring the swelling capacity of the product. |
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haizhoubuer: 金币+30, 翻译EPI+1, ★★★★★最佳答案, 太棒啦！ 2014-11-04 09:32:58
haizhoubuer: 金币+30, 翻译EPI+1, ★★★★★最佳答案, 太棒啦！ 2014-11-04 09:32:58
| β环糊精（β-CD）为一环状寡糖，由7个葡萄糖分子通过α-1,4-葡糖苷键连接组成，在芽孢杆菌环糊精葡糖基转移酶作用下由直链淀粉生成，具有一个手性、亲水性的外层和疏水性内部空腔微环境（Szejtli, 1998; Dell Valle, 2004）。以前的研究集中在利用β-CD结构形成包合物，主要用于有机化合物的吸附和环保处理，化妆品，缓释药物等领域（Banerjee & Chen, 2010; Cobos, Martinez Perez, Monreal Romero, & Garcia Casillas, 2007; Guo & Jiang, 2007）。 β-CD是可生物降解的，含有大量醇羟基以便进行醚化，酯化，氧化，交联，等化学反应（Dell Valle，2004）。由于含有大量的亲水性羟基，β-CD适合作为用于合成SAP的起始材料。然而，β-CD的分子量低。为了提高产物的分子量，亲水性单体可以通过化学交联反应与β-CD链接。同时，β-CD的环状寡糖化学结构可以提高交联反应产物的三维网状结构，有利于产物的溶胀能力。 |
2楼2014-11-03 09:50:28
