Abstract
A polysaccharide, isolated from rapeseed hulls by extraction with aqueous sodium hydroxide—sodium tetraborate, contained residues of l-arabinose, l-fucose, d-xylose, d-galactose, and d-glucose in the proportions of 2:8:25:13:52. Acetolysis furnished cellobiose, 6- O-α- d-xylopyranosyl- d-xylopyranosyl- d-glucose, and 2- O-β- d-galactopyranosyl d-xylose. The cleavage products from the methylated polysaccharide were examined by g.l.c. of the methyl glycosides and g.l.c.—mass spectrometry of the partially methylated, alditol acetates. The results show that the polysaccharide is a member of the xyloglucan group in which additional fucose and galactose residues terminate some of the side-chains. For comparative purposes, aspects of the structures of xyloglucans from nasturtium seeds and suspension-cultured sycamore cells have been re-examined.
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