Objective:HPLC was used to determine the contents of glycyrrhizic acid,isoliquiritin and isoliquiritigenin in compound liquorice tablets quantitatively.
An investigation is also made on determining DMDAAC qualitatively by bromophenol blue test and quantitatively by tetraphenyl boron sodium precipitation reac...
The carboxylic content in oxycellulose was analyzed quantitatively by FTIR using KSCN as internal standard.Calibration curve with good linear relationship was obtained.