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The study was aimed at evaluating the antioxidant activity of hydroalcoholic solution extracts of Urtica dioica L. (UD), Malva neglecta Wallr. (MN) plants and their mixture. In this study, flower (UDF), root (UDR), seed (UDS) and leaf (UDL) parts of UD and flower (MNF) and leaf (MNL) parts of MN were used. The antioxidant properties of hydroalcoholic extracts and their mixture were evaluated using different antioxidant tests such as total antioxidant activity, reducing power, superoxide anion radical scavenging, hydrogen peroxide scavenging, free radical scavenging, and metal chelating activity for comparison. In addition, total phenolic compounds in the extracts of both plants were determined as catechin equivalent. The various antioxidant activities were compared to natural and synthetic standard antioxidants such as BHA, BHT and α-tocopherol. According to FTC method, the both extracts exhibited strong total antioxidant activity. At the concentration of 100 μg/mL, Hydroalcoholic extracts of UDS, UDR, UDF, UDL, MNF, MNL, and UD-MN showed 81.7%, 79.8%, 78.3%, 76.4%, 77.3%, 74.1%, and 80.7%, respectively. Comparable, 100 μg/mL of standard antioxidants BHA, BHT and α-tocopherol exhibited 66.2%, 70.6%, and 50.1% inhibition on peroxidation of linoleic acid emulsion, respectively. In addition, UD-MN showed strong superoxide anion radical scavenging activity comparable with UDR, UDF, UDL, MNF, and MNL. Based on the findings, plants mixture was commonly found to have synergistically higher antioxidant activity.

Evaluation of in-vitro Antioxidant Properties of Hydroalcoholic Solution Extracts Urtica dioica L., Malva neglecta Wallr. and Their Mixture