Study on isolating and purifying soy isoflavone aglycone by ultrasound-assisted acid hydrolysis

The high purification soy isoflavone aglycone was extracted from low purification soy isoflavone product by ultrasound-assisted acid hydrolysis.In this study,the factors which influence to the acid hydrolysis,such as ultrasound power,reaction time,reaction temperature,reaction system PH value and so on,are studied systematically and deeply.The experiment results indicate that the ultrasound have promoting function to isoflavone acid hydrolysis and the optimum extracting condition of ultrasound-assisted acid hydrolysis is ultrasound power 80W,reaction time 1h,reaction tempera- ture 70℃,concentration of acid 1M.The product purity is 93.2% by using ultrasound-assisted acid hydrolysis methods.