ABSTRACT
Objective To compare diffenrent amounts of the glycyrrhizic acid extracted by two methods-decoct method and Ammonia-water method.Methods The best extraction conditions including amount of affusion water and solvent,extraction time,boiling time,crash time,vibrating time and concentration of ammonia were choosed by orthogonal design.Amounts of the glycyrrhizic acid were determined by ultraviolet spectrophotometry at 252 nm wavelengh.Result The best extraction conditions from decoct method were that amount of affusion wate was 200 mL,extract 2 times,boiling time was 5 min,crash time was 20 s.The best extraction conditions from Ammonia-water method were that amount of 0.4% ammonia was 200 mL,vibrating time was 2 h,extract 2 times.The extraction rate of Ammonia-water method was 32%,and the extraction rate of decoct method was 26%.Conclusion For glycyrrhizic acid extraction and purity,Ammonia-water has superior efficient than decoct method at the best conditions.