STUDY OF USING MICROWAVE TO THE FLAVONOIDS EXTRACTION FROM ASPARAGUS TEA

This experiment was done for raw materials with the asparagus tea.The conditions of flavonoids extracted by microwave treatment from asparagus tea and the antioxidant activity of flavonoids were discussed.The probable range of the extraction time,ethanol concentration and the ratio of solvent to raw materials were obtained through one-factor experiments and the orthogonal experiment were designed.The results showed that the optimum extraction conditions were:time 45 s,ethanol concentration 80 % and the proportion(mL/g)of materials 1:25.Under this condition,the extract rate of flavonoids was 88.0 %.The order of factors to affect the flavonoids extraction was:ethanol concentration extraction times the ratio of solvent to raw materials.The ability of the clearance free radical and the antioxidant activity of flavonoids of asparagus tea were studied.The results showed that the extract has strong ability of the clearance free radical and certain antioxidant activity.The biggest ability of the clearanced free radical was obtained at flavones concentration 0.66 mg/mL,the inhibition rate that under this concentration was 91.2 %.The inhibition rate of flavones to pro-oxide was 14.4 % at flavones concentration 1.32 mg/mL.