Methylation of hot-water-extract fraction of soybean seed polysaccharides by the Haworth’s method and then by the Purdie’s method followed by fractional extraction afforded a fully methylated arabinogalactan which gave on complete hydrolysis 2,3,5-tri-, and 2,3-di-O-methyl l-arabinose and 2,3,6-tri-, and 2,6-di-O-methyl d-galactose in the approximate proportion of 1 : 1 : 3 ~ 4: 1, and on controlled acid methanolysis 2,3,5-tri-, and 2,3-di-O-methyl l-arabinose in about equal proportion. Residual undegraded polysaccharide gave mainly 2,3,6-tri-O-methyl d-galactose on remethylation and hydrolysis.
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Makio Morita (1965) studied this question.
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