Phenylethanoids, iridoids and a spirostanol saponin from Veronica turrilliana

Phytochemistry. 2007 May;68(9):1321-6. doi: 10.1016/j.phytochem.2007.02.014. Epub 2007 Mar 30.

Abstract

From the aerial parts of Veronica turrilliana two phenylethanoid glycosides, turrilliosides A and B and a steroidal saponin, turrillianoside were isolated and their structures elucidated as beta-(3,4-dihydroxyphenyl)ethyl-4-O-E-caffeoyl-O-[beta-glucopyranosyl-(1-->4)-alpha-rhamnopyranosyl-(1-->6)]-beta-glucopyranoside, beta-(3,4-dihydroxyphenyl)ethyl-4-O-E-caffeoyl-[6-O-E-feruloyl-beta-glucopyranosyl-(1-->4)-alpha-rhamnopyranosyl-(1-->6)]-beta-glucopyranoside and (23S,25S)-12beta,23-dihydroxyspirost-5-en-3beta-yl O-alpha-rhamnopyranosyl-(1-->4)-beta-glucopyranoside, respectively. Furthermore, eight known glucosides are reported namely, catalpol, catalposide, verproside, amphicoside, isovanilloylcatalpol, aucubin, arbutin, and 6-O-E-caffeoylarbutin, the latter two for the first time in the genus Veronica. The two phenylethanoid glycosides were found to be potent DPPH radical scavengers. All of the tested compounds were inactive against the representative species of fungi and bacteria.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Iridoids / chemistry*
  • Iridoids / isolation & purification*
  • Molecular Structure
  • Phenols / chemistry*
  • Phenols / isolation & purification*
  • Plant Components, Aerial / chemistry
  • Spirostans / chemistry*
  • Spirostans / isolation & purification*
  • Veronica / chemistry*

Substances

  • Iridoids
  • Phenols
  • Spirostans