Jansson P E, Kenne L, Wehler T
Department of Organic Chemistry, Arrhenius Laboratory, University of Stockholm, Sweden.
Carbohydr Res. 1988 Aug 15;179:359-68. doi: 10.1016/0008-6215(88)84132-6.
13C-N.m.r. data for some Shigella flexneri O-polysaccharides are reported. It is concluded that the chemical shifts observed for the linear Shigella flexneri type Y O-polysaccharide are similar to those calculated by adding substituent shifts, obtained from disaccharides with similar stereochemistry around the glycosidic linkage, to the chemical shifts for the monomers. The influence of substitution with alpha-D-glucopyranosyl and/or O-acetyl groups in different positions of this polysaccharide on the chemical shifts has been investigated. Possible interactions between sugar residues involved in the branching have been investigated by energy minimisations (GESA) of disaccharide and of trisaccharide elements.
报道了一些福氏志贺氏菌O-多糖的13C核磁共振数据。得出的结论是，观察到的线性福氏志贺氏菌Y型O-多糖的化学位移与通过将从糖苷键周围具有相似立体化学的二糖获得的取代基位移加到单体的化学位移上所计算出的化学位移相似。已经研究了该多糖不同位置的α-D-吡喃葡萄糖基和/或O-乙酰基取代对化学位移的影响。通过二糖和三糖单元的能量最小化（GESA）研究了参与分支的糖残基之间可能的相互作用。
