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    • 7. 发明授权
    • Extracting betulinic acid from Ziziphus jujuba
    • 从枣树提取桦木酸
    • US06264998B1
    • 2001-07-24
    • US09516032
    • 2000-03-01
    • Sunder RamadossMohammad Jamshed Ahmed Siddiqui
    • Sunder RamadossMohammad Jamshed Ahmed Siddiqui
    • A61K3578
    • A61K36/725
    • A process for isolating betulinic acid from Ziziphus jujuba is disclosed. The process involves the steps of: a) extracting bark of Ziziphus jujuba in a solvent to obtain an extract containing betulinic acid, b) semi-concentrating the extract containing betulinic acid, c) chilling said semi-concentrated extract overnight to obtain a solid in the extract, d) separating the solid from the extract by filtration or centrifugation, e) dissolving the separated solid from step d) in hot methanol, refluxing with activated charcoal and filtering through a celite bed to obtain a methanolic solution, f) partially concentrating the methanolic solution of step e), adding halogenated hydrocarbon solvent and chilling overnight to obtain a solid in the solution, g) separating the solid of step f) by filtration or centrifugation and drying the solid to obtain a solid enriched in betulinic acid, h) dissolving the dried solid step g) in a solvent containing pyridine and acetic anhydride, separating an organic layer and drying to obtain a crude 3-acetoxy betulinic acid, i) washing the crude solid 3-acetoxy betulinic acid obtained in step h) with an alcohol to yield pure solid 3-acetoxy betulinic acid obtained in step i) in an aqueous alcoholic alkali solution to yield pure betulinic acid.
    • 公开了一种从枣树中分离桦木酸的方法。 该方法包括以下步骤:a)在溶剂中提取枣子的树皮以获得含有桦木酸的提取物,b)半浓缩含有桦木酸的提取物,c)将所述半浓缩提取物冷却过夜以获得固体 提取物,d)通过过滤或离心从提取物中分离固体,e)将步骤d)中分离的固体溶解在热甲醇中,与活性炭回流并通过硅藻土床过滤以获得甲醇溶液,f)部分浓缩 步骤e)的甲醇溶液,加入卤代烃溶剂并冷却过夜以在溶液中获得固体,g)通过过滤或离心分离步骤f)的固体,并干燥固体,得到富含桦木酸的固体,h )将干燥的固体步骤g)溶解在含有吡啶和乙酸酐的溶剂中,分离有机层并干燥,得到粗品3-乙酰氧基桦木酸,i)洗涤cr 在步骤h)中获得的固体3-乙酰氧基桦木酸与醇在步骤i)中获得的纯固体3-乙酰氧基桦木酸在醇水溶液中混合,得到纯的桦木酸。