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Solvent type has a very significant effect on both extraction rate and the final yield of total isoflavones£®50£¥ ethanol aqueous solution and water call achieve a much better performance than 95£¥ ethanol aqueous solution and n-butanol£®The increase is observed on the extraction rate and the yield of total isoflavones for all the solvents when ultrasound is applied£®The higher the electrical power input in the range of 0Ò»650W,the higher the extraction yield£®Moreover,a mathematical model of ultrasonically assisted extraction£¬accounting for different extraction solvents and the electrical power input,is established£®The coresponding model parameters are obtained to quantify the mass transfer enhancement by ultrasound£®The results show that the model can satisfactorily describe the behavior of ultrasonically assisted extraction of isoflavones from the stem of Pueraria lobata(Willd.)Ohwi£®

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