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Stilbene derivatives from Gnetum gnemon Linn
Ibrahim Iliya1, Zulfiqar Ali, Toshiyuki Tanaka
1Gifu Pharmaceutical University, 5-6-1, Mitahora-higashi, Gifu 502-8585, Japan.
Phytochemistry
|February 1, 2003
Summary
Researchers isolated four novel stilbene derivatives, gnemonols K, L, M, and gnemonoside K, from Gnetum gnemon roots. These compounds, along with known stilbenoids, were evaluated for antioxidant properties.
Area of Science:
- Phytochemistry
- Natural Products Chemistry
- Pharmacognosy
Background:
- Gnetum gnemon (Gnetaceae) is a plant source of bioactive stilbenoids.
- Stilbenoids exhibit diverse biological activities, including antioxidant effects.
- Understanding the chemical constituents of Gnetum gnemon is important for potential therapeutic applications.
Purpose of the Study:
- To isolate and characterize novel stilbene derivatives from Gnetum gnemon roots.
- To investigate the antioxidant activities of the isolated stilbenoids.
Main Methods:
- Extraction of Gnetum gnemon root using various solvents (acetone, methanol, 70% methanol).
- Isolation of compounds using chromatographic techniques.
- Structure elucidation of isolated compounds via spectral analysis (e.g., NMR, MS).
- Evaluation of antioxidant activity, including lipid peroxide inhibition and superoxide radical scavenging assays.
Main Results:
- Four new stilbene derivatives: gnemonols K and L (resveratrol trimers), gnemonol M (isorhapontigenin dimer), and gnemonoside K (glucoside of resveratrol trimer) were identified.
- Eleven known stilbenoids and one lignan were also isolated.
- The isolated stilbenoids demonstrated antioxidant activity in lipid peroxide inhibition and superoxide scavenging assays.
Conclusions:
- Gnetum gnemon root is a rich source of structurally diverse stilbenoids.
- The identified stilbene derivatives possess significant antioxidant potential.
- Further research into these compounds may lead to the development of new antioxidant agents.