Glycyrrhizin is the main fat-soluble flavonoid in Glycyrrhiza glabra, which can be obtained by using organic solvent extraction method to prepare crude total flavonoids, which can be separated by column chromatography and purified by organic solvent reconstitution.
Glycyrrhiza glabra root can be extracted 3 times with dichloromethane at room temperature, concentrated under reduced pressure to obtain brown extract, separated into 6 components by silica gel chromatography, and separated again by reverse silica gel column chromatography 9 components, and recrystallize the components with benzene-cyclohexane to obtain pure licorice.
Another method is to extract licorice root (1kg) with methanol, group and separate by three kinds of column chromatography, and then repeatedly recrystallize to obtain pure licorice root pure product (250mg).
On the basis of the second extraction method, the extraction of Glycyrrhiza glabra root with acetone, organic solvent extraction, evaporation under reduced pressure, grouping with AL2O3, column chromatography, separation by preparative thin-layer separation and recrystallization of mixed solvents, etc. The purity of glycyrrhizin simplifies the operation process and is suitable for the rapid preparation of high-purity glycyrrhizin products.
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