印度楝(Azadirachta indica)新鲜成熟果皮(20kg)室温下用乙醇反复提取3次,真空回收乙醇,得到较稠的棕色残余物,在乙酸乙酯和水中分配,溶于乙酸乙酯的部分用4％碳酸钠溶液处理,分出酸性部分,乙酸乙酯层用水洗,无水硫酸钠干燥,真空蒸干,残余物依次用石油醚和乙醚提取,溶于乙醚的部分在90％甲醇溶液-石油醚(1:1)中分配,溶于90％甲醇液的 Azadirachta indica fresh ripe peel (20kg) was repeatedly extracted with ethanol three times at room temperature and ethanol was recovered in vacuo to give a thick brown residue, which was partitioned between ethyl acetate and water. The solution was treated with a sodium carbonate solution and the acidic portion was separated. The ethyl acetate layer was washed with water, dried over anhydrous sodium sulfate, evaporated to dryness in vacuo, and the residue was extracted with petroleum ether and ether in that order. The ether-soluble fraction was in a 90% methanol solution-oil. Dissolved in ether (1:1) and dissolved in 90% methanol