Antiplasmodial Quinones from the Rhizomes of Kniphofia foliosa
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Date
2013
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Natural product communications
Abstract
Extracts of the rhizomes of Kniphofia foliosa exhibited antiplasmodial activities against the chloroquine-sensitive (D6) and chloroquine-resistant (W2) strains of Plasmodium falciparum with IC50 values of 3–5 g/mL. A phenyloxanthrone, named 10-acetonylknipholone cyclooxanthrone (1) and an anthraquinoneanthrone dimer, chryslandicin 10-methyl ether (2), were isolated from the rhizomes, along with known quinones, including the rare phenylanthraquinone dimers, joziknipholones A and B. The structures of these compounds were determined based on spectroscopic data. This is the second report on the occurrence of the dimeric phenylanthraquinones in nature. In an in vitro antiplasmodial assay of the isolated compounds, activity was observed for phenylanthraquinones, anthraquinone-anthrone dimers and dimeric phenylanthraquinones, with joziknipholone A being the most active. The new compound, 10-acetonylknipholonecyclooxanthrone, also showed anti-plasmodial activity. In an in vivo assay, knipholone anthrone displayed marginal antimalarial activity
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Induli, M., Gebru, M., Abdissa, N., Akala, H., Wekesa, I., Byamukama, R., ... & Yenesew, A. (2013). Antiplasmodial quinones from the rhizomes of Kniphofia foliosa. Natural product communications, 8(9), 1934578X1300800920.https://doi.org/10.1177/1934578X1300800920