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چکیده
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Many human diseases are caused or negatively affected by free radicals. The natural defense of the human organism against free radicals is not always sufficient mainly due to the significant exposition to free radicals from external sources in the modern world. The dietary intake of antioxidants plays an important role in the protection of the human organism againts free radicals. Many clinical and epidemiological studies show a connection between the antioxidant activity of the substances present in the diet and the prevention from such diseases as cardiovascular diseases or carcinogenesis. Fruits, vegetables, grains, teas, and some kinds of spices are natural sources of antioxidants [1,2]. Lavender is a perennial and evergreen plant of Lamiaceae (the mint family) with blue, purple, and very fragrant flowers that has been used in traditional medicine [3]. This medicinal plant is widely used in folk medicine in different parts of the world and especially distinguished as an antiseptic. In this work, a simple and sensitive electrochemical method for the evaluation of antioxidant capacity of ethanolic leave extract of lavandula has been developed. The electrochemical oxidation of leave extract of lavandula has been investigated by cyclic voltammetry and Differential pulse voltammetry (DPV) techniques. The results show that lavandula ethanolic extract oxidize at low potentials in comparison of galic acid, salicilic acid and quercetin as standard antioxidants. Also, Antioxidant activities of this extract was evaluated using the 2,2-diphenyl-2-picrylhydrazyl (DPPH) radical-scavenging method and it is directly related to its redox potential value. The results show the good antioxidant activity of the lavandula extract.
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