STUDY ON EXTRACTION TECHNOLOGY OF ONIONSKIN FLAVONES

The technological process of extracting flavones from onion-skin was studied in this paper. Extraction technology of flavones in onionskin was studied by single factor and orthogonal experiment. Effects of ethanol-water solvent, extraction temperature, extraction time, ratio of liquid to material on extraction rate of flavones were investigated. The optimum extraction conditions for onionskin flavones were established as follows: 70 % ethanol(V/V)as solvent, ratio of solvent to material 20:1(V/W),reflux extraction at 80 ℃ for 2 h.The content of flavones in onionskin was as high as 37.16 mg/g.