利用薄层扫描法与薄层层离-分光光度法分析古方四妙勇安汤中阿魏酸的含量，采用硅胶G－0．8%－CMC－Na薄层板，以苯-乙酸乙酯-甲醇（16：4：1）外加3滴甲酸为展开剂，分别用岛津CS－9000型薄层扫描仪和752型紫外分光光度计测定四妙勇安汤中阿魏酸的含量，两种方法所测得的结果比较接近。

The content of ferulic acid in Simiaoyongan Decoction(SMYAD),a traditional recipe originated in the late Qing Dynasty containing a decoction of four wonderfully effective herbal drugs for the safe recovery of arteriosclerotic gangrene and erythromelalgia etc,was determined by TLC-scanning and TLCspectrophotometry.The sample solution was spotted on silica gel G plate and the developing solvent was benzene:ethyl acetate:methanol(16: 4:1)and 3 drops of formic acid. There was no significant difference between the results obtained by the two methods.