Polysaccharides of soy-beans. Part III. Extraction and fractionation of polysaccharides from cotyledon meal

Authors:
  • GAG. O. Aspinall
    G. O. Aspinall
  • RBR. Begbie
    R. Begbie
  • AHA. Hamilton
    A. Hamilton
  • JWJ. N. C. Whyte
    J. N. C. Whyte
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Abstract
Extraction of defatted soy-bean cotyledon meal, after prior removal of soluble sugars and protein, with ethylene-diaminetetra-acetic acid disodium salt furnished a mixture of an arabinogalactan and an acidic polysaccharide complex. The arabinogalactan has been shown to contain chains of 1 → 4 linked β-D-galactopyranose residues in which every fourth or fifth residue carries through C-3 a side-chain containing, on the average, two L-arabinofuranose residues joined by a 1 → 5 linkage. The acidic polysaccharide complex has been shown to possess a highly branched structure with residues of galacturonic acid, galactose, arabinose, xylose, fucose, and rhamnose in which side-chains are terminated by galactopyranose, fucopyranose, xylopyranose, and arabino-furanose residues.