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Methyl quadrangularates A-D and related triterpenes from Combretum quadrangulare
A H Banskota1, Y Tezuka, K Q Tran
1Institute of Natural Medicine, Toyama Medical and Pharmaceutical University, Sugitani, Japan.
Chemical & Pharmaceutical Bulletin
|April 27, 2000
Summary
This study isolated fifteen new cycloartane-type triterpenes and several flavonoids from Combretum quadrangulare. The isolated flavonoids demonstrated potent cytotoxicity against colon cancer cells.
Area of Science:
- Phytochemistry
- Natural Products Chemistry
- Pharmacology
Background:
- Combretum quadrangulare is a plant species with potential medicinal properties.
- Triterpenes and flavonoids are classes of natural compounds known for diverse biological activities.
Purpose of the Study:
- To isolate and characterize new cycloartane-type triterpenes and other compounds from Combretum quadrangulare leaves.
- To evaluate the cytotoxic activity of the isolated compounds against murine colon 26-L5 carcinoma cells.
Main Methods:
- Extraction of Combretum quadrangulare leaves using methanol.
- Isolation and purification of compounds using chromatographic techniques.
- Structure elucidation through spectral analysis (NMR, MS) and chemical conversions.
- Cytotoxicity assays using murine colon 26-L5 carcinoma cells.
Main Results:
- Fifteen new cycloartane-type triterpenes (methyl quadrangularates A-D, N-P, methyl 24-epiquadrangularate C, quadrangularic acid E, 23-deoxojessic acid, 1-O-acetyl-23-deoxojessic acid, quadragularols A and B, norquadrangularic acids B and C) were identified.
- Two known cycloartane-type triterpenes and several flavonoids were also isolated.
- Cycloartane-type triterpenes exhibited varying degrees of cytotoxicity.
- Flavonoids displayed strong cytotoxicity with ED50 values ≤ 6 μM against colon cancer cells.
Conclusions:
- Combretum quadrangulare is a rich source of structurally diverse cycloartane-type triterpenes.
- The isolated flavonoids possess significant cytotoxic potential against liver metastatic colon cancer cells, warranting further investigation for therapeutic applications.