Structure of water-soluble acidic polysaccharides isolated from the bark of Ceiba pentandra var. indica
✍ Scribed by T. Shantha Raju; D. Channe Gowda; Yernool V. Anjaneyalu
- Publisher
- Elsevier Science
- Year
- 1989
- Tongue
- English
- Weight
- 847 KB
- Volume
- 191
- Category
- Article
- ISSN
- 0008-6215
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✦ Synopsis
The water-soluble polysaccharide fraction, isolated from the bark of C. pen&n&a var. indica by delignification, contained L-rhamnose, o-xylose, Larabinose, D-glucose, D-galactose, o-glucuronic acid, and b-galacturonic acid. Fractionation using Cetavlon and ethanol gave two acidic polysaccharides, each containing L-rhamnose, o-glucuronic acid, and o-galacturonic acid with mol. wts. of 1.318 X lo6 and 1.445 X 105. On the basis of the results of methylation analysis of the native and carboxyl-reduced polysaccharides, partial hydrolysis, oxidation with periodate and chromium trioxide, and 'H-n.m.r. spectroscopy, the two acidic polysaccharides were concluded to have the following repeating unit.
-+ 4)-a-o-GalpA-(1+2)-a-L-Rhap-(l-+ ? 1 /3-D-GlcpA lNTRODUCTION The Kapok tree, Ceiba penrandra var. indica, which is a South-East Asian variety of C. pentandra Linn., is widely distributed in India and has extensive industrial and medicinal applications i. The bark of the tree is a rich source of a hitherto unstudied mucilaginous substance which consists mainly of several polysaccharide components. Because of the economic importance of the Kapok tree and recent reports on the mucilaginous polysaccharides from commercially important plant barks2, we have studied the polysaccharides present in the bark of C. pentundra var. indica and now report the isolation, purification, and structure of two water-soluble acidic polysaccharides.