Study on the extraction of soluble dietary fiber from sunflower seed shells and its antioxidant activity

The optimization of extraction technology of soluble dietary fiber (SDF) in sunflower seed shells and its anti-oxidative activities were studied. Results showed that the optimized extraction conditions were as follows:solid-liquid ratio 1∶30, extraction solvent 9.5% Na OH, extraction temperature 40℃, extraction time 30 min. Under these conditions, the extraction rate of SDF was 21.32%. The SDF showed strong scavenging activities on1, 1-Diphenyl-2-picrylhydrazyl radical (DPPH) , superoxide radical (O2-·) and hydroxyl radical (·OH) methods, the scavenging rates for the radicals were 86.67%, 70.32% and76.33%, respectively, when the concentration was 1.0mg/m L.