Process And Dynamics Research Of Microwave-assisted Extracted Effective Ingredients From Second-class Green Tea

This paper mainly studies the process and dynamic mechanism to extract polyphenols and caffeine from the green tea by microwave-assisted method.Extract polyphenols with solvent extraction method, mainly inspects the influence of microwave temperature, microwave time, microwave power, material to liquid ratio, volume fraction of ethanol to extraction rate. Choose the main factors to do orthogonal experiment, the best parameters extraction temperature 90℃, the heating time is 20min, material liquid is 1:16, microwave power is 250w, extraction rate is 81.50%.Extractional rate is higher than the similar documents. The method by microwave extraction can save a lot of time. Then after resin column, get purifying polyphenol can apply to food industry.Extract caffeine with microwave-assisted method, to sublimate get caffeine. Contrasted water formulation and alcohol extraction, conventional heating and microwave aided heating; Choose microwave-assisted method separately inspected the influence of microwave temperature, time, power, ethanol volume fraction and liquid materials to extraction rate.Optimized by orthogonal experiment, get the best process conditions is temperature 90℃, the heating time 15min, mighty material liquid 1:25, ethanol concentration 80%, power 250w. extraction rate is 87.35%,the highest extraction rate is 99.6%.The produced caffeine is high purity, can be directly used in food industry.