Abstract
The structure of the polysaccharide from Cercidium praecox (R&P) Harms gum exudate has been studied by Smith degradation, by sugar and methylation analyses, and by 13C NMR spectroscopy. The results showed a (1 → 4)-xylan core. Some xylose residues are substituted at O-2 by α- d-glucuronic acid and 4- O-methyl-α- d-glucuronic acid residues. β- d-Glucuronic acid is present, probably as terminal residues. The arabinose is present as α- l-furanose and β- l-pyranose.
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