本文报道用薄层层析-光密度计法直接测定甘草根和浸膏中甘草酸的含量,并与气相层析法测定的结果进行比较。作者认为,气相层析法结果偏高,这是因为该方法是在水解后提取进行分析,原来存在于甘草中的甙类也就同时被测定,致使结果显著增高,不能反映甘草酸的真实含量,因此作者认为,薄层层析-光密度计法比上述方法精确。标准曲线:将25、50、75和100mg甘草酸溶解于 In this paper, the content of glycyrrhizic acid in licorice root and extract was determined by TLC-densitometry, and compared with the results of gas chromatography. The author believes that the results of gas chromatography is high, because the method is extracted after hydrolysis for analysis, the original glycosides in licorice will also be measured at the same time, resulting in significantly higher results, can not reflect the true content of glycyrrhizic acid Therefore, the authors believe that TLC-ODT method is more accurate than the above method. Standard curve: 25, 50, 75 and 100 mg glycyrrhizic acid dissolved in