Optimization of Process Conditions of Total Flavonoids Extraction from Blueberry Leaves by Ultrasonic Method

To optimize the extraction conditions of total flavonoids from raspberry leaves by ultrasonic method.Total flavonoids was extracted from blueberry by ultrasonic method.The effects of four factors including ultrasonic power,ultrasonic time,ethanol concentration,solid-liquid ratio on the yield of total flavonoids were investigated.The optimum technological conditions of total flavonoids extraction were confirmed through the orthogonal test.The results showed that the optimum exaction technology conditions of blueberry were as follows:ultrasonic power for high stall,ultrasonic time of 70 min,50% ethanol concentrationand solid-liquid ratio of 1∶20,the yield of total flavonoids was 23.178%.The extraction process was simple,reasonable,and could be used for determining the content of total flavonoids from raspberry.