Study on the Technology Optimization of Extract Flavones from Onion by Ethanol Refluxing Associated with Microwave Pretreatment

Objective:The technological process of extracting flavones from onion using microwave pretreatment-ethanol refluxing method was studied in this paper.Methods:Extraction technology of flavones in onion was studied by UV spectrophotometry and orthogonal experiment.Effects of microwave pretreatment time,ethanol-water solvent,microwave power,ratio of material to liquid on extraction rate of flavones were investigated.Results:The optimum extraction conditions for onion flavones were established as follows:microwave power 900W,microwave time:5min,80% ethanol,the ratio of material to liquid was 1∶ 10.Conclusion:The method of study on microwave-alcohol process in onion flavones is feasible and has high efficiency,which is easy to be operated compared to other flavones extraction methods.The experiment laid a foundation of optimizing the extraction process of flavones in onion and can provide methods for the determination of preparations associated with onion flavones.