Research on the Extraction of Total Flavonoids from Licorice Residue with Microwave-assisted Technique

[Objective] The best extraction technique of total flavonoids from licorice residue was explored.[Method] The orthogonal design was used in the research on the extraction technique of total flavonoids from licorice residue with organic solvent assisted with microwave.[Results] The optimum conditions on the extraction of total flavonoids from licorice residue was as follows: ethanol,80%;the ratio of solid to liquid,1∶10;microwave power,300 W and the return of microwave-assisted,1.0 h.[Conclusion] The technique ensured a high content of flavonoids extracted,which was the optimization extraction measure of total flavonoids from licorice residue.