Abstract:

This text studied on the methods of extracting flavonoids of different organs on the bitter buckwheat as raw materials. The method was the high pressure extraction and the Ultrasonic extraction and the mix high pressure and the Ultrasonic extraction. The results showed that, in high pressure extraction 15 min, the content of flavonoids in the leaf was 5.46% and that of stem was 1.27%, and that of root was 0.54%. In the Ultrasonic extraction 60 min, the content of flavonoids in the leaf was 5.72% and that of stem was 1.71%, and that of root was 0.84%. In mix high pressure and the Ultrasonic extraction, the content of flavonoids was the highest in high pressure 10 min + the Ultrasonic extraction 30 min. The content of flavonoids of leaf was 6.43% and that was better than the average of the same conditions in high pressure extraction (5.07%) and that increased by 1.27%, and that was better than the average of the same conditions in the Ultrasonic extraction (5.53%), and that increased by 0.81%. The conclusion was that, the rate of recovery was the highest and that was up to 96.7% in high pressure 10 min + the Ultrasonic extraction 30 min.