Fabaceae Polysaccharides. III. Galactomannan from <Emphasis Type="Italic">Astragalus cicer</Emphasis> seeds |
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Authors: | D N Olennikov A V Rokhin |
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Institution: | (1) Institute of General and Experimental Biology, Siberian Branch, Russian Academy of Sciences, 670047 Ulan-Ude, ul. Sakh′yanovoi 6, Russia;(2) Irkutsk State University, 664033 Irkutsk, ul. Lomonosova 123, Russia |
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Abstract: | Seeds of Astragalus cicer L. (Fabaceae) afforded a galactomannan (5.90% yield of seed mass) of molecular weight 1064 kDa, solutions of which had high
viscosity η] 925.5 mL/g and optical activity α]D +71.9°. The galactomannan consisted of galactose and mannose units in a 1:1.39 ratio. Physicochemical methods established
that the main chain of the polysaccharide consisted of 1,4-β-D-mannopyranose units substituted at 72% of the C-6 positions by single α-D-galactopyranose units. The content of variously substituted galactose mannobiose units Man–Man, (Gal)Man–Man/Man–Man(Gal)
and (Gal)Man–Man(Gal) in the galactomannan were 18.7, 19.8, and 61.5%, respectively. |
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