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Two new glycosides from Astragalus caprinus.

N Semmar1, B Fenet, M A Lacaille-Dubois

  • 1Laboratoire de Phytochimie et Biologie Moléculaire, Université Claude Bernard, 43 Bd. 11 Novembre, 69622 Villeurbanne, France. Nabilsemmar@hotmail.com

Journal of Natural Products
|May 26, 2001
PubMed
Summary

Two novel compounds, a flavonol glycoside and a cycloartane-type triterpene glycoside, were identified in Astragalus caprinus. These findings expand the known chemical diversity of this plant species.

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Area of Science:

  • Phytochemistry
  • Natural Product Chemistry
  • Organic Chemistry

Background:

  • Astragalus caprinus is a plant species known for its diverse secondary metabolites.
  • Previous research has indicated the presence of various bioactive compounds in Astragalus species.
  • Understanding the chemical constituents of A. caprinus is important for potential pharmacological applications.

Purpose of the Study:

  • To isolate and characterize novel chemical compounds from Astragalus caprinus.
  • To elucidate the structures of newly discovered glycosides using spectroscopic methods.

Main Methods:

  • Isolation of compounds from leaf and root extracts of Astragalus caprinus.
  • Structure elucidation using comprehensive spectroscopic data interpretation, including NMR and Mass Spectrometry.

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  • Chemical nomenclature assignment for the identified compounds.

    • Main Results:

    • Isolation of a new flavonol glycoside, kaempferol derivative (1), from the leaves.
    • Isolation of a new cycloartane-type triterpene glycoside (2) from the roots.
    • Detailed structural determination of compound 1 as 3-O-[[beta-D-xylopyranosyl(1-->3)-alpha-L-rhamnopyranosyl(1-->6)][beta-D-apiofuranosyl(1-->2)]]-beta-D-galactopyranosyl kaempferol.
    • Detailed structural determination of compound 2 as 3-O-(beta-D-xylopyranosyl)-24-O-(beta-D-glucopyranosyl)-20,25-epoxycycloartane-3beta,6alpha,16beta,24alpha-tetrol.

    Conclusions:

    • The study successfully identified and characterized two previously unknown glycosides from Astragalus caprinus.
    • The findings contribute to the phytochemical knowledge of the Astragalus genus.
    • The isolated compounds represent new additions to the diverse natural products found in this plant species.