[Extraction and antioxidant activity of flavonoids from Aralia cordata]

In this study, microwave-assisted extraction techniques of flavonoids fom Aralia cordata were studied by the single factor analysis and orthogonal test, then the property antioxidant activities of flavonoids extracts were evaluated by two antioxidant assays, for 1,1-diphenyl-2-picrylhydrazyl (DPPH) radicals scavenging and reducing power. The results showed that the optimum conditions were as follows: twice extracting Aralia cordata with 75 times volume (V/W) of 30% ethanol at 140W of microwave for 60 min at 80 degrees C. Under these conditions, the extraction yield was 1.35%. The flavonoids extracts could significantly scavenge DPPH and superoxide anion free radicals in dose-dependent manner, meanwhile a linear correlation between its concentration and reducing power was also observed (R2 = 0.9855).