Antiplasmodial Quinones from Pentas longiflora and Pentas lanceolata

Yenesew A., Endale, M. AAREDNMWSJPHM. "Antiplasmodial Quinones from Pentas longiflora and Pentas lanceolata." Planta medica . 2012;78:31-35.


The dichloromethane/methanol (1 : 1) extracts of the roots of PENTAS LONGIFLORA and PENTAS LANCEOLATA showed low micromolar (IC (50) = 0.9-3 µg/mL) IN VITRO antiplasmodial activity against chloroquine-resistant (W2) and chloroquine-sensitive (D6) strains of PLASMODIUM FALCIPARUM. Chromatographic separation of the extract of PENTAS LONGIFLORA led to the isolation of the pyranonaphthoquinones pentalongin ( 1) and psychorubrin ( 2) with IC (50) values below 1 µg/mL and the naphthalene derivative mollugin ( 3), which showed marginal activity. Similar treatment of PENTAS LANCEOLATA led to the isolation of eight anthraquinones ( 4-11, IC (50) = 5-31 µg/mL) of which one is new (5,6-dihydroxydamnacanthol, 11), while three - nordamnacanthal ( 7), lucidin- ω-methyl ether ( 9), and damnacanthol ( 10) - are reported here for the first time from the genus PENTAS. The compounds were identified by NMR and mass spectroscopic techniques.

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