The structure of cholla gum has been investigated using ( a ) the methylation procedure, ( b ) by oxidation of the polysaccharide with periodate (the Smith procedure), and ( c ), by its partial hydrolysis with the formation of sugars and oligosaccharides. It is composed of a main chain of D ‐galactopyranose residues fi‐linked 1 → 3 and/or 1 → 6, to which are attached side chains. These branches contain D ‐galacturonic acid, D ‐galactose, and D ‐xylose, all in the pyranose form, and L ‐rhamnose and L ‐arabinofuranose residues. The chains are terminated by D ‐xylopyranose or L ‐arabinofuranose units. D ‐Xylose is present only in terminal residues.
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Parikh et al. (1965) studied this question.
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