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收集新鲜的白花牛角瓜(Calotropis procera)(34kg),室温下用甲醇提取,甲醇提取液在减压下蒸发,粘性残渣经氯仿-水层析,氯仿可溶性部分经蒸发后,分为
Fresh Calotropis procera (34kg) was collected and extracted with methanol at room temperature. The methanol extract was evaporated under reduced pressure. The viscous residue was purified by chloroform-water chromatography. The soluble fraction of chloroform was evaporated and then separated.