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首页> 外文期刊>Magnetic Resonance in Chemistry: MRC >Diastereomeric difference of inclusion modes between (-)-epicatechin gallate, (-)-epigallocatechin gallate and (+)-gallocatechin gallate, with beta-cyclodextrin in aqueous solvent
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Diastereomeric difference of inclusion modes between (-)-epicatechin gallate, (-)-epigallocatechin gallate and (+)-gallocatechin gallate, with beta-cyclodextrin in aqueous solvent

机译：（-）-表儿茶素没食子酸酯，（-）-表没食子儿茶素没食子酸酯和（+）-没食子儿茶素没食子酸酯与β-环糊精在水溶液中的包合方式的非对映异构差异

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摘要

inclusion complexes of (-)-epicatechin gallate (ECg) as well as (+)-gallocatechin gallate (GCg) and beta-cycloclextrin (beta-CD) in an aqueous solution were investigated using several NMR techniques and a computational method. ECg and EGCg formed a 1:1 complex with beta-CD, in which the A ring and a portion of the C ring were included from the wide secondary hydroxyl group side of the beta-CD cavity, and the B and B' rings were left outside the cavity. GCg formed a 1:2 complex with beta-CD, in which the A and B rings of GCg were included by two molecules of beta-CD. The difference between the two modes of inclusion of the 1:1 complex of ECg, EGCg. beta-CD and the 1: 2 complex of GCg. beta-CD might have resulted from the size of the space between the B and B rings in aqueous solution. As a result of nueclear Overhauser effect (NOE) experiments, GCg was considered to have a large enough space between the B and B' rings to include the B ring in the beta-CD cavity; on the other hand, ECg and EGCg have no such large space. Copyright (C) 2008 John Wiley & Sons, Ltd.
机译：使用几种NMR技术和一种计算方法研究了（-）-表儿茶素没食子酸酯（ECg）以及（+）-没食子儿茶素没食子酸酯（GCg）和β-环糊精（β-CD）的包合物。 ECg和EGCg与β-CD形成1：1的络合物，其中A环和一部分C环包含在β-CD腔的宽仲羟基一侧，而B和B'环为留在空腔外面。 GCg与β-CD形成1：2的复合物，其中两个分子的β-CD包含GCg的A和B环。 ECg，EGCg 1：1配合物的两种包含方式之间的差异。 β-CD和GCg的1：2配合物。 β-CD可能是由于水溶液中B和B环之间的空间大小所致。作为nueclear Overhauser效应（NOE）实验的结果，GCg被认为在B和B'环之间具有足够大的空间，可以将B环包括在beta-CD腔中;另一方面，ECg和EGCg没有那么大的空间。版权所有（C）2008 John Wiley＆Sons，Ltd.

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