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Extracts from the root bark of Calotropis gigantea were subjected to bioactivity-guided fractionation using growth inhibitory effects against Entamoeba histolytica. The n-hexane soluble portion of the chloroform extract showed in vitro antiamoebic activity against the HK-9 strain of Entamoeba histolytica. Chromatographic separation of the chloroform extract afforded the known compound, procesterol, which showed activity against E. histolytica.

Activity of Extracts and Procesterol from Calotropis gigantea against Entamoeba histolytica