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Chemistry of Natural Compounds

, Volume 44, Issue 6, pp 685–687 | Cite as

Polysaccharides of Fabaceae. I. Galactomannan of Astragalus sericeocanus seeds

  • D. N. OlennikovEmail author
  • A. V. Rokhin
Article

Galactomannan (yield 3.58% of seed mass) of molecular weight 876 kDa was isolated from seeds of Astragalus sericeocanus Gontsch. (Fabaceae). Its solutions had high viscosity [η], 764.6 mL/g, and optical density [α]D +65.3°. The polysaccharide consisted of galactose and mannose in molar ratio 1:1.58. The main chain of the galactomannan macromolecule was constructed of 1,4-β-D-mannopyranose units, 63% of which were substituted at C-6 by single α-D-galactopyranose units. 13C NMR spectroscopy established that the galactomannan contained units of differently substituted galactose mannobiose units: Man-Man, (Gal)Man-Man, and/or Man-Man(Gal) in addition to (Gal)Man-Man(Gal), the ratio of which was 0.15:0.51:0.34.

Key words

Astragalus sericeocanus Fabaceae galactomannan 13C NMR spectroscopy. 

Notes

Acknowledgment

We thank Senior Scientist of the Institute of General and Experimental Biology (Ulan-Ude), Candidate of Biological Sciences D. V. Sandanov for supplying samples of A. sericeocanus seeds.

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Copyright information

© Springer Science+Business Media, Inc. 2008

Authors and Affiliations

  1. 1.Institute of General and Experimental Biology, Siberian BranchRussian Academy of SciencesUlan-Ude, ul. Sakh′yanovoi, 6Russia
  2. 2.Irkutsk State UniversityIrkutsk, ul. Lomonosova, 123Russia

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