The total flavonoids (TF), total phenolics, and antioxidant activity of Limoniastrum feei aqueous extract were investigated. The results show that Limoniastrum feei contains 200.28?±?2.75?μg of total phenolic in 1?mg of dry extract, expressed as gallic acid equivalents. The TF represent 54.77?±?3.21?μg/mg, expressed as Quercetin equivalents. The antioxidant activity of extracts has been evaluated by chemical and electrochemical methods. In the reducing power and total antioxidant capacity tests, the antioxidant activity of extracts was expressed as Ascorbic acid equivalents where the aqueous extract has an equivalent capacity of 233.39?±?4.23 and 112.4?±?1.97?μg for 1?mg, respectively. In DPPH? radical trapping test, the IC 50 was equal to 0.58?±?0.03?mg/ml. The cyclic voltammetry of the extract indicates one oxidation irreversible peak at approximately 300–320?mV/(Ag/AgCl). The superoxide scavenging assay of Limoniastrum feei aqueous extract showed an average activity of order 61.46?±?2.51% at 0.5?mg/ml doses.
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