Polysaccharides of Azuki Beans. I. Neutral Homopolysaccharides "Arabinans" from Alkaline Extract of the Seeds of Phaseolus radiatus L. var. aurea PRAIN

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Two kinds of arabinans AL-I and AL-II, as neutral homoglycan, have been isolated by alkaline extraction from azuki beans, which are the seeds of Phaseolus radiatus L. var. aurea PRAIN. Both arabinans were homogeneous as judged by gel filtration (Sephadex G-200), and electrophoresis. Structural analysis indicated that these arabinans had a chain of 1→5 linked L-arabinofuranose units bearing a highly branched structure with branching points either at each of position 2 and 3 or at both these positions, to which non-reducing terminal furanosyl residues were attached. At the branching points, the proportion of 1→2 linkage was larger than that of 1→3 linkage. Both arabinans were similar, but some significant differences between AL-I and AL-II were observed in physical properties such as molecular weight and solubility in 80% aqueous ethanol solution. The structural differences between two were found in such respects that the amount of non-reducing terminal residues in AL-I was slightly larger than that in AL-II, and the proportion of 1→5 linkage bearing branch point at position 2 or 3 in AL-I was lower than that in AL-II.
公益社団法人日本薬学会の論文
1978-06-25