Cycloartane-type glycosides from Astragalus amblolepis

Phytochemistry. 2009 Mar;70(5):628-34. doi: 10.1016/j.phytochem.2009.03.006. Epub 2009 Apr 6.

Abstract

Five cycloartane-type triterpene glycosides were isolated from the methanol extract of the roots of Astragalus amblolepis Fischer along with one known saponin, 3-O-beta-D-xylopyranosyl-16-O-beta-D-glucopyranosyl-3beta,6alpha,16beta,24(S),25-pentahydroxy-cycloartane. Structures of the compounds were established as 3-O-beta-D-xylopyranosyl-25-O-beta-D-glucopyranosyl-3beta,6alpha,16beta,24(S),25-pentahydroxy-cycloartane, 3-O-[beta-D-glucuronopyranosyl-(1-->2)-beta-D-xylopyranosyl]-25-O-beta-D-glucopyranosyl-3beta,6alpha,16beta,24(S),25-pentahydroxy-cycloartane, 3-O-beta-D-xylopyranosyl-24,25-di-O-beta-D-glucopyranosyl-3beta,6alpha,16beta,24(S),25-pentahydroxy-cycloartane, 6-O-alpha-L-rhamnopyranosyl-16,24-di-O-beta-D-glucopyranosyl-3beta,6alpha,16beta,24(S),25-pentahydroxy-cycloartane, 6-O-alpha-L-rhamnopyranosyl-16,25-di-O-beta-D-glucopyranosyl-3beta,6alpha,16beta,24(S),25-pentahydroxy-cycloartane by using 1D and 2D-NMR techniques and mass spectrometry. To the best of our knowledge, the glucuronic acid moiety in cycloartanes is reported for the first time.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Astragalus Plant / chemistry*
  • Carbohydrate Sequence
  • Glycosides / chemistry
  • Glycosides / isolation & purification*
  • Magnetic Resonance Spectroscopy
  • Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
  • Triterpenes / chemistry
  • Triterpenes / isolation & purification*

Substances

  • Glycosides
  • Triterpenes
  • cycloartane