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根据硫氰化铬铵在酸性介质中可与大分子季铵盐类药物定量生成难溶于水的络合物的原理 ,用过量的硫氰化铬胺试剂 ,与益母草浸膏中的盐酸水苏碱反应 ,沉淀后用比色法测定滤液中的剩余试剂 ,间接测定益母草浸膏的含量。其回收率为 10 0 95% ,RSD =1 78%
According to the principle that ammonium thiocyanate can form macromolecular quaternary ammonium salts quantitatively insoluble in water in acid medium, using an excess of chromic amine thiocyanate reagent and hydrochloric acid water in motherwort extract After the reaction with threonine, the residual reagent in the filtrate was determined by colorimetry after precipitation, and the content of motherwort extract was indirectly determined. The recovery rate is 10 0 95% with RSD =1 78%