M.A. Thesis:

Evaluation of Antioxidant Activity Of Physalis Alkekengi extract and Stability effect in Soybean Oil

There are several methods to prevent oxidation of oils, one of which is the addition of synthetic antioxidants. However, since synthetic antioxidants have undesirable effects, such as the effect of mutagenicity and carcinogenicity in humans, it is necessary to investigate the sources of antioxidants in order to replace synthetic compounds. In this research, ethanolic extracts of the cocaine extract were extracted. Then, the amount of phenolic compounds and the inhibitory power of free radicals of the extract and treatments were measured at concentrations of 1000 ppm extract, control oil sample, synthetic antioxidant BHT200ppm, and mixed specimens containing 500ppm extract and 100ppmBHT with folic acid and DPPH tests. In the concentration of 1000ppm of the extract, the antioxidant compounds of the extract increase as a result of increasing the amount of phenolic compounds and inhibitory activity of free radicals. In the next step, the treatments with specified concentrations were refined to no antioxidant soybean oil and the free radical inhibitory activity and also the oxidative stability of soybean oil at 65 ° C for three days were measured by measuring the high oxide index , The DNA number of the conjugate, the acid index was investigated. In general, the results showed that the concentration of 1000 ppm of extract of cocaine in soybean oil at a constant storage time, oxidative stability index, phenolic compounds, and inhibitory activity of free radicals in oil increased while the oxide index decreased acidity index. Therefore, the results of oxidative stability study of oil containing different treatments of CK and BHT extract showed that the concentration of 1000 ppm of the extract in the first place and then the combined sample compared to the concentration of ppm 200 BHT and the control sample due to higher levels of antioxidant compounds in oxidative stability of soybean oil was more effective And compared with synthetic antioxidant BHT. In this way, can be described as a source of natural antioxidants at 1000 ppm in soybean oil.

Keywords: Natural antioxidants, cauliflower, soybean oil, oxidative stability