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植物Vernonia fasciculata Michx的干燥叶,碎取,粉5.4公斤,用氯仿5000毫升,分次于索氏提取器中提取,提取液于50℃真空浓缩至糖浆状物,用50%热乙醇提尽,过滤,除去胶状物,滤液真空浓缩,并于室温冷却过夜,得红色沉淀(A)130.5克;该沉淀用氯仿处理,不溶解部分(B),滤除之,得0.5克,滤液蒸发至干,得固体(C)130克。
The dried leaves of the plant Vernonia fasciculata Michx were crushed and 5.4 kg of powder was extracted with 5000 ml of chloroform. The extracts were fractionated into a Soxhlet extractor and the extracts were concentrated in vacuo at 50° C. to a syrup and extracted with 50% hot ethanol. After filtration, the gum was removed, and the filtrate was concentrated in vacuo and cooled at room temperature overnight to give a red precipitate (A) of 130.5 g. The precipitate was treated with chloroform and the insoluble portion (B) was removed by filtration to give 0.5 g. The filtrate was evaporated to Dry, get solid (C) 130 grams.