芦荟素是芦荟叶中主要的蒽醌类成分,通常以芦荟素A和B两种非对映异构体形式并存,目前已成为许多芦荟产品质量控制指标之一.采用高速逆流色谱和硅胶柱色谱结合的方法,从老芦荟干粉中分离制备了高纯度的芦荟素A(纯度为98%)和芦荟素B(纯度为96%)样品,并采用快原子轰击质谱(FAB-MS)和核磁共振氢谱(1H NMR)以及GOESY(gradient-enhanced nuclear Overhauser effect spectroscopy)等方法对所得的两个芦荟素异构体的立体构象进行了确认.该法具有制备量大和分离效率高的特点.
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