M.A. Thesis:

Evaloation of Antioxidant Actitiy of Eringium Campestre extract and its stability effect in soybeen oil

Abstract Synthetic antioxidants have carcinogenic properties, and in recent years, attention has been focused on natural antioxidants (especially plant sources). In the meantime, phenolic compounds have been known as extraneous foods due to its antioxidant properties and health effects on human health. In this Then, the amount of phenolic compounds and the inhibitory power of free radicals of extracts in concentrations of 0, 200, 400, 800 and 1000 ppm were measured by Folin and DPPH testsstudy, In the next step, different concentrations of extract (800.400, 1000 ppm) with synthetic antioxidant (BHT) were added to soot treated soybean oil without antioxidant and antioxidant activity as well as oxidative stability of soybean oil at 65 ° C Centigrade for three days was measured by measuring the oxidizing index, acidity index and dendrimer DNA and finally comparing with antioxidant treated soybean Statistical analysis was done by Duncan test at the probability level of 0.05 (p <0.05) using SPSS 16 software and all tests were repeated three timesoilmethanolic extract The results showed that increasing the concentration of the extract from 200 ppm to 1000 ppm compared to the control sample due to increased phenolic and tocopherol compounds, the antioxidant compounds of the extract increased and the acidity index decreased with respect to the high oxide indexOn the other hand, at constant concentrations, increasing the retention time of oil from one to Therefore, the results of oxidative stability study of oil containing different concentrations of extract of plant extract indicated that the concentration of 1000 ppm of extract was more effective than oxidation stability of soybean oil due to higher levels of antioxidant compounds than other Therefore, the results of oxidative stability study of oil containing different concentrations of extract of plant extract indicated that the concentration of 1000 ppm of extract was more effective than oxidation stability of soybean oil due to higher levels of antioxidant compounds than other concentrations.concentrations.three days increased the oxide index, and the acidity index..

Keywords: Containing plant, phenolic compounds, peroxide number, acidity index, conjugated DNA