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Polysaccharides of Fabaceae. VI. Galactomannans from seeds of Astragalus alpinus and A. tibetanus

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Galactomannans with galactose:mannose ratios 1:1.48 and 1:1.33, [α]D +67.9 and +76.4°, [η] 870.3 and 1337.1 mL/g, and molecular weights 999 and 1549 kDa, respectively, were isolated in 0.59 and 4.65% yields (of seed mass) from seeds of Astragalus alpinus and A. tibetanus (Fabaceae). Physicochemical methods (CrO3 oxidation; methylation–GC/MS; IR, NMR, and 13C spectroscopy) found that the main polysaccharide chain consisted of 1,4-β-D-mannopyranose units substituted 67.5% (A. alpinus) and 75.2% (A. tibetanus) at the C-6 position by single α -D-galactopyranose units. The contents of mannobiose blocks Man–Man, (Gal)Man–Man/Man–Man(Gal), and (Gal)Man–Man(Gal) variously substituted with galactose were according to 13C NMR spectroscopy 15.9, 55.5, and 28.6% in A. alpinus galactomannan and 9.9, 42.3, and 47.8% in A. tibetanus galactomannan.

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Acknowledgment

The work was supported financially by the Lavrent´ev Competition for Young Scientists of the SB RAS.

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Authors and Affiliations

  1. Institute of General and Experimental Biology, Siberian Branch, Russian Academy of Sciences, 670047, Ulan-Ude, Russia

    D. N. Olennikov

  2. Irkutsk State University, 664033, Irkutsk, Russia

    A. V. Rokhin

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  1. D. N. Olennikov
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  2. A. V. Rokhin
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Correspondence to D. N. Olennikov.

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Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 309–311, May–June, 2011.

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Olennikov, D.N., Rokhin, A.V. Polysaccharides of Fabaceae. VI. Galactomannans from seeds of Astragalus alpinus and A. tibetanus . Chem Nat Compd 47, 343 (2011). https://doi.org/10.1007/s10600-011-9928-y

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  • DOI: https://doi.org/10.1007/s10600-011-9928-y

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