The anti-malarial activity of 20 quinones isolated from Cassia alata, Cassia occidentalis, Garcinia kola and Ocimum basilicum was investigated in vitro using the micro dilution test of Desjardin by a visual evaluation on thin blood smears. The six quinones isolated from C. occidentalis, three from C. alata and three from O. basilicum were found to be the most active with an IC50 value of below 1 mu g/ml. The others quinones showed a moderate activity with IC50 values of between 5 and 20 mu g/ml.
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Univ KwaZulu Natal Pietermaritzburg, Sch Life Sci, Res Ctr Plant Growth & Dev, ZA-3209 Scottsville, South AfricaUniv KwaZulu Natal Pietermaritzburg, Sch Life Sci, Res Ctr Plant Growth & Dev, ZA-3209 Scottsville, South Africa