Alkylamides of Acmella oleracea

Area of Science:

• Natural Product Chemistry
• Phytochemistry
• Organic Chemistry

Background:

• Acmella oleracea is a plant known for its bioactive compounds.
• Alkylamides are a class of natural products with diverse biological activities.
• Previous phytochemical studies have explored various parts of Acmella oleracea.

Purpose of the Study:

• To isolate and characterize compounds from the flowers of Acmella oleracea.
• To identify novel alkylamides and their known analogues.
• To establish a convenient method for alkylamide analysis in A. oleracea.

Main Methods:

• Phytochemical investigation using chromatographic techniques.
• Structure elucidation employing advanced Nuclear Magnetic Resonance (NMR) spectroscopy, including COSY, HSQC, HMBC, and NOESY.
• Development of a sample preparation technique for concentrating alkylamide-rich fractions.

Main Results:

• Isolation of one new alkylamide, (2E,5Z)-N-isobutylundeca-2,5-diene-8,10-diynamide (1).
• Identification of four known alkylamide analogues (2-5).
• Establishment of an efficient method for concentrating the target fraction and creating a fingerprint profile for A. oleracea.

Conclusions:

• The chemical constituents of Acmella oleracea flowers include a novel alkylamide.
• Advanced NMR techniques are crucial for the definitive structural determination of complex natural products.
• The developed method facilitates the analysis and quality control of A. oleracea extracts.