Antifungal Phenylpropanoid Glycosides from Lippia rubella

J Nat Prod. 2019 Mar 22;82(3):566-572. doi: 10.1021/acs.jnatprod.8b00975. Epub 2019 Feb 28.

Abstract

Lippia species share various pharmacological activities and are used in traditional cooking and medicine worldwide. Combined chromatographic techniques such as column chromatography, high-performance liquid chromatography, and countercurrent chromatography led to the purification of two new antifungal phenylpropanoid glycosides, lippiarubelloside A (1) and lippiarubelloside B (2), by bioactivity-directed fractionation of an ethanol-soluble extract from Lippia rubella, in addition to the known active related compounds forsythoside A (3), verbascoside (4), isoverbascoside (5), and poliumoside (6). The structures of compounds 1 and 2 were determined by comparison of their NMR spectroscopic data with the prototype active compound 4. Cryptococcus neoformans, which causes opportunistic lung infections, was sensitive to compounds 1-6 in the concentration range of 15-125 μg/mL. A synergistic effect (FICindex = 0.5) between 3 and amphotericin B was demonstrated. The glycosylated flavonoids pectolinarin (7), linarin (8), and siparunoside (9) were also isolated.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antifungal Agents / chemistry
  • Antifungal Agents / pharmacology*
  • Candida / drug effects
  • Cryptococcus / drug effects
  • Glycosides / chemistry
  • Glycosides / pharmacology*
  • Lippia / chemistry*
  • Phenylpropionates / chemistry
  • Phenylpropionates / pharmacology*
  • Plant Extracts / chemistry
  • Plant Extracts / pharmacology
  • Spectrum Analysis / methods

Substances

  • Antifungal Agents
  • Glycosides
  • Phenylpropionates
  • Plant Extracts