About antioxidant activity of some representatives of flora of the fergana valley

The article presents the results of the determination of the antioxidant activity of aqueous and alcoholic extracts of 18 medicinal plants growing in the Fergana Valley using an electrochemical analyzer Σ - AOA. A solution containing 0.005 M K3 [Fe (CN) 6] and 0.001M K4 [Fe (CN) 6] in 0.05 M phosphate buffer with a pH of 6.86 was used as an electrochemically reversible mediator system. The standard of antioxidant activity was an aqueous and alcoholic solut ion of ascorbic acid with a known concentration. It was shown that all of the studied plants possess antioxidant activity to some extent. At the same time, water extracts of Hypericum, Rosa, Thymus, Inula have a more pronounced total antioxidant activity compared to other studied plants. Alcoholcontaining plant extracts have been found to have greater antioxidant activity compared to aqueous extracts. It is also shown that the use of other standards for calculating the total AOA in medicinal plant raw materials and phytopreparations practically does not change the ratio between the values, although it gives other values. In this case, the stronger the antioxidant standard, the smaller the value of the total antioxidant activity in the object under study