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Bioactive phenolic compounds from a medicinal lichen, Usnea longissima
Muhammad I Choudhary1, Azizuddin, Saima Jalil
1H.E.J. Research Institute of Chemistry, International Center for Chemical Sciences, University of Karachi, Karachi 75270, Pakistan. hej@cyber.net.pk
Phytochemistry
|August 17, 2005
Summary
Two new natural products, longissiminone A and longissiminone B, were isolated from Usnea longissima lichen. Longissiminone A demonstrated significant anti-inflammatory effects in cell assays without cytotoxicity.
Area of Science:
- Natural Product Chemistry
- Pharmacology
- Medicinal Lichenology
Background:
- Lichens are a source of unique bioactive compounds.
- Usnea longissima is a medicinal lichen with potential therapeutic properties.
Purpose of the Study:
- To isolate and characterize novel natural products from Usnea longissima.
- To evaluate the anti-inflammatory and cytotoxic activities of isolated compounds.
Main Methods:
- Isolation of compounds using chromatographic techniques.
- Structure elucidation via spectroscopic methods (NMR, MS).
- In vitro anti-inflammatory and cytotoxicity assays.
Main Results:
- Two new compounds, longissiminone A (1) and longissiminone B (2), were identified.
- Longissiminone A exhibited potent anti-inflammatory activity.
- Compounds 1 and 2 showed no cytotoxicity at 200 µg/mL.
Conclusions:
- Usnea longissima is a valuable source of bioactive natural products.
- Longissiminone A is a promising candidate for anti-inflammatory drug development.
- The isolated compounds possess a favorable safety profile.