Sesquiterpene lactones from Scorzonera austriaca

Area of Science:

• Natural Products Chemistry
• Phytochemistry
• Organic Chemistry

Background:

• Scorzonera austriaca is a plant species known to produce bioactive compounds.
• Sesquiterpene lactones are a diverse class of natural products with a wide range of biological activities.
• Previous research has identified various compounds from the Scorzonera genus.

Purpose of the Study:

• To isolate and characterize new sesquiterpene lactones from Scorzonera austriaca.
• To elucidate the chemical structures of these novel compounds.
• To evaluate the potential anticancer properties of the isolated compounds.

Main Methods:

• Extraction of plant material using acetone.
• Isolation of compounds using chromatographic techniques.
• Structure elucidation through spectroscopic methods, including 1D and 2D Nuclear Magnetic Resonance (NMR) and High-Resolution Mass Spectrometry (HRMS).
• In vitro evaluation against a panel of cancer cell lines.

Main Results:

• Six new sesquiterpene lactones, named scorzoaustriacoside (1), scorzoaustriacin (2), scorzoaustriacin 3-O-beta-d-glucoside (3), 4-epi-dihydroestafiatol (4), 14-isovaleroxyscorzoaustricin (5), and 14-isovaleroxyscorzoaustricin sulfate (6), were successfully isolated.
• Five known guaianolides were also identified.
• The structures of the new compounds were confirmed by detailed NMR and HRMS analysis.
• Preliminary biological evaluation indicated potential activity against tested cancer cell lines.

Conclusions:

• The chemical investigation of Scorzonera austriaca roots led to the discovery of six novel sesquiterpene lactones.
• The structural characterization was achieved using advanced spectroscopic techniques.
• The isolated compounds show promise for further investigation as potential anticancer agents.