18.Objective:HPLC was used to determine the contents of glycyrrhizic acid,isoliquiritin and isoliquiritigenin in compound liquorice tablets quantitatively.
19.The determination method of ethylene chlorohydrin content by u sing FID chromatograph polyethylene glycol 20M chromatographic column was introd uced.
20.The paper chromatography-mottle elution chronometry is established which is a simple and convenient and accurate method of quantitatively determining L-leucine.