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Total phenolic contents, hydroxyl radicals and one 1-diphenyl-2picrylhydrazyl (DPPH) scavenging activities, antioxidant capacities and reducing powers of Sideritis leptoclada, which is an endemic plant to Turkey, and Mentha ¥ dumetorum were investigated in water extracts. Total phenolic contents were detected to be 0.32 mg gallic acid/mg dry biomass in the presence of 1.33 and 9.82 mg/mL, respectively. Fifty percent scavenging activities of hydroxyl and DPPH radical were determined with 0.03 and 0.16 mg/mL extracts of S. leptoclada and 0.21 and 1.6 mg/mL extracts of Mxdumetorum. In addition, total antioxidant capacities of S. leptoplada were also higher than Mxdumetorum and there was a significant difference between the controls. The result of this study suggests that extracts of S. leptoclada and Mxdumetorum can be used as potential source of natural antioxidants and as a possible food supplement or in the pharmaceutical industry. PRACTICAL APPLICATIONSThe research is focused on the determination of new potential plant sources of antioxidants that can be used as food. Antioxidants are vital substances that possess the ability to protect the body from damage caused by reactive oxygen species induced oxidative stress. In this study, infusions in boiled water of Sideritis leptoclada, which is a plant endemic to Turkey, and Mentha x 3 Corresponding 285 dumetorum have high levels of antioxidant capacity. The results of the study show that extracts of S. leptoclada and Mxdumetorum can be used as a supplement agent to increase in quality of food and for the pharmaceutical industry.

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