Optimization of the Extraction Process of Flavonoids from Hawkthorn

The extraction process of flavonoids from hawkthorn by ethanol extraction method was optimized.Through single factor experiment and orthogonal experiment,the optimum conditions were obtained as follows:solid-liquid ratio 1∶60(g∶mL),ethanol volume fraction 70%,extraction time 7 h,and extraction temperature 50 ℃.Under above conditions,the extraction rate reached 2.80% with stable extraction efficiency.