The invention relates to a preparation method for a high-purity
glabridin monomer, and relates to the preparation method for the high-purity
glabridin monomer by separation from licorice. The preparation method mainly solves the problems of complicated preparation process, low separation efficiency, long
separation time, and large consumption amount of a
solvent. The method provided by the invention is characterized by comprising the following steps: preparation of a
glabridin extract; concentration of glabridin by using a reversed-phase C18
column chromatography: successively eluting the extract with alcohols respectively with a concentration of 50%, 70% and 95%, respectively collecting eluents, and subjecting the collected eluent of the
alcohol with the concentration of 70% to vacuum concentration until the eluent is dried so as to obtain crude glabridin; and separation of the above-mentioned crude glabridin with a high-speed countercurrent chromatographic technology: placing a separating
solvent in a
separatory funnel and carrying out complete shaking, then carrying out standing and layering, dissolving the above-mentioned crude glabridin in the separating
solvent, and respectively measuring the concentrations of supernatant and subnatant solutions containing the glabridin with a highly-efficient liquid-phase chromatographic method. The preparation method for the high-purity glabridin
monomer provided by the invention has short
separation time and high
recovery rate, is free of
pollution, and saves the solvent.