本文提出了采用80％乙醇迥流提取,继用薄层层析——分光光度法测定丹参中原儿茶醛含量的方法。原儿茶醛浓度在(2.0～8.0)×10~(-6)g/ml范围内与吸收值呈良好的线性关系。加样回收率为96.50％,标准差3.447％,变异系数3.57％。本法取样量少,操作简便。用本法测定了九种不同来源丹参中原儿茶醛的含量,其中以江苏省产的丹参为最高,湖北省产的丹参较低。 This article proposes a method for the determination of protocatechuic aldehyde content in Salvia miltiorrhiza by using 80% ethanol turbulent flow extraction followed by thin layer chromatography-spectrophotometry. The protocatechuic aldehyde concentration showed a good linear relationship with the absorption value in the range of (2.0-8.0)×10-6 g/ml. The recovery rate was 96.50%, the standard deviation was 3.447%, and the coefficient of variation was 3.57%. This method has a small sample size and is easy to operate. This method was used to determine the content of protocatechuic aldehydes in nine different sources of Salvia miltiorrhiza, of which Salvia miltiorrhiza is the highest in Jiangsu Province and Salvia miltiorrhiza is lower in Hubei Province.