Structural Studies of the Gum Jeol Polysaccharide.

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Abstract
The polysaccharide obtained from gum jeol has been shown to be composed of D-galactose, L-arabinose, and D-galacturonic acid. The hydrolysis of the fully-methylated gum yielded 2,3,5-tri-O-methyl-L-arabinose (2.03 mol.), 2,3,4,5-tetra-O-methyl-D-galactose (3.1 mol.), 2, 3, 4-tri-O-methyl-D-galactose (1 mol.), 2,4-di-O-methyl-D-galactose (1.94 mol.), 2-O-methyl-L-arabinoses (1.05 mol.) and 2-O-methyl-D-galac-tose (1.1 mol.) in the neutral fraction of the hydrolysate. The reduced acidic fraction gave 2,3,4-tri-O-methyl-D-galactose (2 mol.) and 2,4-di-O-methyl-D-galactose (2 mol.). The structural significance has been discussed from the above results and from the results of periodate oxidation studies of the gum. The molecular weight of the methylated gum has also been determined by the light-scattering method.