Antioxidant capacity of phenolic extracts from Sphallerocarpus gracilis stem leaves

The antioxidant activity of phenolic extracts from Sphallerocarpus gracilis stem leaves was studied.The antioxidant activity of the extract was evaluated by spectrophotometry on its ability of scavenging 1-diphenyl-2-picrylhydrazy (DPPH·) , hydroxyl radical (·OH) , superoxide anion radical (O2-·) , nitrite, β-carotene bleaching test, and total reducing power. BHT and VC were used as positive control. Results indicated that the polyphenol extracts had a good antioxidant capacity, some indicators even better than the positive control. In addition, polyphenol extracts and purified in a different measurement system in the scavenging ability were quite different at the same concentration (p<0.05) . It could be used as natural antioxidants further developed and utilized.