Stack R J, Weisleder D
Northern Regional Research Center, U.S. Department of Agriculture, Peoria, IL 61604.
Biochem J. 1990 Jun 1;268(2):281-5. doi: 10.1042/bj2680281.
Butyrivibrio fibrisolvens strain 49 excretes a polysaccharide that contains D-glucose, D-galactose, 4-O-(1-carboxyethyl)-D-galactose, and an acidic component of previously unknown structure. We report here the identity of the unknown as 4-O-(1-carboxyethyl)-L-rhamnose. The structure of this previously unknown compound was deduced from (1) comprehensive electron-impact and chemical-ionization mass-spectroscopic studies of differentially labelled derivatives prepared from the unknown, (2) 13C-n.m.r. and 1H-n.m.r. studies of purified neutral sugars derived from the unknown and (3) chemical degradation experiments.
溶纤维丁酸弧菌菌株49分泌一种多糖,该多糖含有D-葡萄糖、D-半乳糖、4-O-(1-羧乙基)-D-半乳糖以及一种结构未知的酸性成分。我们在此报告该未知物为4-O-(1-羧乙基)-L-鼠李糖。这种此前未知化合物的结构是通过以下方法推导出来的:(1) 对由该未知物制备的差异标记衍生物进行全面的电子轰击和化学电离质谱研究;(2) 对源自该未知物的纯化中性糖进行碳-13核磁共振和氢-1核磁共振研究;(3) 化学降解实验。