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An aqueous two phase system (ATPS) coupled with ultrasonic was employed to extract flavonoids from Cyclocarya paliurus (Batalin) Iljinskaja leaves first time. The optimal conditions were determined by Response Surface Methodology(RSM) of ethanol concentration 33%; salt concentration 15%; extraction time 52 min; liquid‐solid ratio 33:1, while the flavonoids extraction yield obtained the maximum of...
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