The invention relates to an extraction method of
genistein. The method comprises the following steps: fully mixing the grinded
raw material pagodatree pod with the grain size of 20-80 meshes and 80-95v%
ethanol in the ratio of 1 / 8-1 / 15(w / v), pumping into a hydrodynamic force sonic energy generator, introducing
sophoricoside to extraction
solvent under the action of
acoustic wave with the frequency of 1k-3kHz and the
sound pressure level of 216-236dB which is generated by the flowing of the hydrodynamic force sonic energy generator, while performing further
hydrolysis; after the
solid-liquid separation, using
ethanol to dissolve water-insoluble precipitate which is obtained by removing
solvent in liquid part, after the
ethanol dissolving process, performing
silica gel column chromatography, using ethanol for
elution, collecting the eluant, and removing
solvent to obtain
genistein. The method is a green extraction method without additional energy under the action of hydrodynamic force
sound energy, the
genistein can be obtained directly, the extraction process can be completed without any additional auxiliary component at
room temperature, high purity extract can be obtained, and the damage of the effective ingredient can be avoided mostly. The treatment process is simple, the equipment is stable and reliable, the extraction equipment and the floor space are greatly reduced, andthe
continuous operation can be realized, the unit capacity is high, the extraction time is greatly reduced, and the extraction cost is only 1 / 10-1 / 20 of that of the conventional method.