Studies on Extraction Technology of Total Flavonoids from Fresh Onion by Ethanol Reflux Method

Extraction of total flavonoids from fresh onion by ethanol reflux method was discussed.Optimum extraction conditions determined by single factor experiments and orthogonal method were solvent 70%ethanol,ratio of material to solvent was 1:20(g:mL),temperature 60 ℃ and duration 120 min and the extraction rate of total flavonoids was up to1.7310%.The characteristics of the method included the extraction rate of total flavonoids high,economic and environmental.no need of special equipment,suitable for industrial production,and conducive to depth development and application for medical efficacy of onion.