Comparing the antioxidant extract of the quince's peel with hexane and ethyl acetate solvents for oxidation of crude soybean oil prevention

Nowadays, due to the importance of waste management in the food industry, reuse of waste processing and increase their added value , the extraction of functional ingredients such as natural antioxidants is growing. In this study, the effect of antioxidant quince peel in oil oxidation stability by the peroxide and thiobarbituric acid tests was investigated using non-polar solvent n- hexane and ethyl acetate as polar solvent in various concentrations of zero (control), 300, 600 and 900 ppm in crude soybean oil. Also, the effect of 100 ppm of BHT and mixed the BHT with the extracts by same ratio were compared with the effect of antioxidant quince's peel on the stability of crude soybean oil. The results showed that with increasing the concentration of the quince peel extract, oxidation stability improved. Also the concentrations higher than 600 ppm were more effective and almost similar to effect of 100 ppm BHT. The synergistic effect of ethyl acetate extract was obvious using the synthetic antioxidant BHT on oxidative stability of crude soybean oil, while this effect was not noticeable for the extracts from hexane solvent. Overall, ethyl acetate extracts have shown to be more effective due to the same polarity with phenolic compounds in oxidative stability of crude soybean oil