Germacranes and m-menthane from Illicium lanceolatum

Area of Science:

• Natural Product Chemistry
• Pharmacology
• Organic Chemistry

Background:

• Illicium lanceolatum is an adulterant of star anise (Illicium verum).
• Sesquiterpenes and monoterpenes are classes of natural products with diverse biological activities.
• Understanding the chemical constituents of adulterants is crucial for quality control.

Purpose of the Study:

• To isolate and characterize new chemical compounds from Illicium lanceolatum pericarp.
• To determine the absolute stereochemistry of the isolated compounds.
• To evaluate the biological activity of these compounds on a neuroblastoma cell line.

Main Methods:

• Isolation and purification of compounds using chromatographic techniques.
• Structure elucidation using Nuclear Magnetic Resonance (NMR) spectroscopy.
• Determination of absolute stereochemistry via the modified Mosher's ester method.
• Biological activity assessment using SH-SY5Y neuroblastoma cell proliferation assays.

Main Results:

• Three new germacrane sesquiterpenes and one new m-menthane monoterpene were isolated, along with four known compounds.
• All isolated compounds were reported from Illicium plants for the first time.
• Two specific dihydroxygermacrane isomers significantly promoted SH-SY5Y cell proliferation, indicating neurotrophic potential.

Conclusions:

• Illicium lanceolatum contains novel sesquiterpenes and monoterpenes.
• The identified compounds possess potential neurotrophic activity, warranting further investigation.
• This study contributes to the chemotaxonomic understanding of the Illicium genus and identifies potential leads for neuroactive compounds.