Optimization of ultrasonic extraction of total flavonoids from sweet buckwheat seed in Yunnan

The extraction of total flavonoidsfromsweet buckwheat seed inYunnan was optimizedbyultrasonic. The results providedscientific basis for industrial production of the functional flavonoids from sweet buckwheat seed inYunnan. Through the optimization by single factor,with extraction efficiency of total flavonoids,the effects of ultrasonic extraction time,ultrasonic extraction temperature,ultrasonic power,material-to-liquid ratio and ethanol concentration of total flavonoids fromsweet buckwheat were investigated. Through the optimization by orthogonal array design methods, the optimal extraction conditions were found. The experimental results showed that ultrasonic extraction is superior to other methods; the best conditions were ethanol concentration 80%,ultrasonic extraction temperature 70℃,material-to-liquid ratio 1 ∶ 50( g / mL),extraction time 30 minute andultrasonic power 150 W; the effect order was ethanol concentration material-to-liquid ratio ratio of solid to solvent. The yield rate of total flavonoids was 0. 562% which was1. 45 times than other method.