Extractum Glycyrrhizae Liquidum

aking Extractum Glycyrrhizae for 300 ~ 400g, the amount of water, constantly stirring, heating and dissolving, filtration, the filtrate and slowly add 85% ethanol, with the added with stirring until the solution containing ethanol, amounted to about 65%, stayed overnight, remove the supernatant, precipitation with 65% ethanol extraction time, merge three extracts, filtration, recovering alcohol, determination of glycyrrhizic acid in water and ethanol, the amount of glycyrrhizic acid and ethanol, to conform to the stipulation, with concentrated ammonia solution appropriate to adjust pH value, static to make clear, remove the supernatant, filtering, namely.