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Effects of different solvents used to produce extracts from S. oleraceus on Hydroxyl radical (·OH) scavenging assay. The concentrations of different solvent extracts were 100 (□), 500 (▨) and 1000 (▪) µg/ml, respectively. Vitamin E and BHT at the concentration of 100 µg /ml were used as the positive control.
