Studies on the antioxidant activity of some selected medicinal plant using cyclic voltammetry


Salimeh Amidi, Farzad Kobarfard, Abdolmajid Bayandori Moghaddam, Kimia Tabib


Traditional & Complementary Medicine Exhibition 2007 (TCME 2007), Putra World Trade Centre (PWTC), Kuala Lumpur, Malaysia




Cyclic voltammetry, antioxidant, plant extract


Epidemiological studies have shown that a diet rich in fruits and vegetables is associated with a decreased risk of cardiovascular diseases and certain cancers. These beneficial health effects have been attributed in part to the presence of antioxidants in dietary plants. Therefore screening for antioxidant properties of plant extracts has been one of the interest of scientists in this field. Different screening methods have been reported for the evaluation of antioxidant properties of plant extracts in the literature. In the present research a rapid new screening method has been introduced based on cyclic voltammetry for antioxidant screening of some selected medicinal plant extracts. Cyclic Voltammetry of methanolic extracts of seven medicinal plants:Buxus hyrcana, Rumex crispus, Achillea millefolium, Zataria multiflora,Ginkgo boliba, Lippia citriodoraandHeptateceae anisopterawas carried out using a glassy-carbon electrode. Voltammograms for the above mentioned extracts were recorded at different scan rates. Based on the interpretation of voltammograms,Achillea millefolium, Rumex cripsosandLippia citriodorashowed higher antioxidant capability than the others whileZataria multifloracontained highest amount of antioxidant. Antioxidants play a major role in protecting biological systems against many incurable diseases and the use of these substances for prophylactic purposes has been recommended. Cyclic voltammetry is expected to be a simple method for screening antioxidants and estimating the antioxidant activity of foods and medicinal plants. This could be helpful in the evaluation of food quality and creation of beneficial features of products.