Study on the Optimal Extraction Process of Flavonoids from Hengshan Radix Astragali Leaf Tea by Ultrasonic Method
Objective To explore the optimal method for ultrasonic extraction of flavonoids from Radix Astragali leaf tea.Meth-ods Using ultrasound assisted extraction method combined with single factor experiment and orthogonal experiment,the optimal ex-traction process for flavonoids in Hengshan Radix Astragali leaf tea was determined.Result The factors were ranked as follows:ma-terial-liquid ratio>ethanol concentration>ultrasonic power>extraction temperature>extraction time;The optimal extraction pro-cess was as follows:the material-liquid ratio was 1∶35 g/mL,the ethanol concentration was 60%,the ultrasonic power was 280 W,the extraction temperature was 60℃,and the extraction time was 45 min.Conclusion Under these optimal conditions,the extrac-tion rate of total flavonoids in Hengshan Radix Astragali leaf tea was 14.302%.
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