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Abstract
The phenolic concentrations and antioxidant activities of root and stem extracts of Salvadora oleoides were analysed by different methods. The acetone fraction of root as well as acetone and aqueous extracts of the stem showed the highest antioxidant activity compared to other tested extracts. There was a positive correlation between the phenolic concentration of extracts and their respective antioxidant activity. The highest activity in superoxide radical scavenging assay was observed in the acetone stem extract (58.2%, r = 0.9744), while in hydroxyl radical scavenging assay, the aqueous stem extract (34.1%, r = 0.8750) was the most potent scavenger. Acetone root extract showed maximum metal chelating (59.6%, r = 0.9241) and nitric oxide radical scavenging activity (52.6%, r = 0.9463).