期刊
FOOD HYDROCOLLOIDS
卷 20, 期 6, 页码 908-913出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodhyd.2005.09.005
关键词
Sterculia apetala; gum exudates; NMR spectroscopy; structure elucidation
The polysaccharide, isolated from Sterculia apetala, contains galactose, arabinose, xylose and uronic acids. These acid sugars are represented by Galacturonic acid, glucuronic acid and its 4-O-methyl derivative. Application of 1D- and 2D NMR spectroscopy to degraded products, obtained by acid hydrolysis and Smith-degradation processes, and to one oligosaccharide, led to confirm some structural features. Backbone of the structure is a galacturo-rhamnan. These residues are 4-O-linked. The branches are constituted of galactose, arabinose, xylose, rhamnose, beta-D-glucuronic acid and its 4-O-methyl derivative. There were observed interesting homonuclear (proton-proton) and heteronuclear (proton-carbon) chemical shift correlations. (c) 2005 Elsevier Ltd. All rights reserved.
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