1. Bioassay-Guided Isolation and Identification of Antiplasmodial Compounds from the Stem Bark of Clausena excavata.
- Author
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Seephonkai P, Kaewtong C, Wangchuk P, Jearawuttanakul K, Kanjanasirirat P, Borwornpinyo S, Khulmanee T, and Patrapuvich R
- Subjects
- Plant Extracts pharmacology, Plant Extracts chemistry, Plant Bark, Plasmodium falciparum, Clausena chemistry, Antimalarials pharmacology, Antimalarials chemistry, Plants, Medicinal chemistry
- Abstract
Clausena excavata is a medicinal plant widely distributed in Southeast Asia. It is used for a variety of indications, including to treat malaria. In our present study, a phytochemical study of the methanol extract from the stem bark of C. excavata led to the isolation of five pyranocoumarins, nordentatin (1: ), dentatin (2: ), kinocoumarin (3: ), clausarin (4: ), and clausenidin (5: ), and a coumarin, 8-hydroxy-3″,4″-dihydrocapnolactone-2',3'-diol (6: ). The isolation of compound 6: from C. excavata and the antiplasmodial activities against a multidrug-resistant K1 strain of Plasmodium falciparum of 1, 3: , and 5: were reported for the first time. Compounds 3: and 4: exhibited potent antiplasmodial activities with EC
50 values of 1.10 and 0.58 µM, respectively, while 1: and 5: had EC50 values of 5.62 and 7.15 µM, respectively. A prenyl group attached to the C-3 or C-12 position on the pyranocoumarin ring probably plays an important role on the activity. A hydroxyl group at the C-10 position is also likely to enhance the activity., Competing Interests: The authors declare that they have no conflict of interest., (Thieme. All rights reserved.)- Published
- 2023
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