[Objective]The aim was to study the optimum method on the extraction and determination of flavonoids from cottony jujube leaves.[Method] With fresh leaves of cottony jujube as the material,their flavonoids were extracted by ethanol,the effects of ethanol concn.extracting time and extracting temperature on extraction amount of flavonoids were studied.After the differential pulse voltammetry curve was drew with the rutin standard solution,the flavonoids content in extract was determined by differential pulse ...