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用反相高效液相色谱法测定桂甘胶囊中甘草酸的含量。以ＲｅｓｏｌｖｅＯＤＳ柱为分析柱，柱温３５℃，流动相为甲醇－水－醋酸（６９：３１：０．５），检测波长２５４ｎｍ。在此色谱条件下，甘草酸得到很好地分离，制剂中其他组分对测定无干扰。本法简便可靠，精密度高（ｒ＝０．９９９６）。
Determination of Glycyrrhizic Acid in Gui Gan Capsules by Reversed-Phase High Performance Liquid Chromatography. Resolve ODS column was used as the analytical column. The column temperature was 35°C, and the mobile phase was methanol-water-acetic acid (69:31:0.5). The detection wavelength was 254 nm. Under this chromatographic condition, glycyrrhizic acid is well separated and the other components in the formulation do not interfere with the assay. This method is simple and reliable with high precision (r=0.9996).