Objective To study the optimum condition for the ultrasonic extraction of total flavonoids in health food.Methods The total flavonoids was the observation index,the single-factor analysis and orthogonal test design were used to study the effects of different solid-to-liquid ratio(1:25-1:5),ultrasonic time(10-40 min)and ethanol concentration(50%-100%)on the content of total flavonoids extraction in health food by ultraviolet spectrophotometric method.Results Based on the data analysis of the orthogonal test ...