Impact of refining on oat oil antioxidant capacity

In order to further increase the oat oil utilization value as edible oil, oat oil extracted by petroleum ether, hexane, isopropanol, ethyl acetate and ethanol, and soybean oil were refined to compare their differences in reducing power and DPPH· scavenging activity. The study results showed that the reducing power and DPPH· scavenging activity of refined oils were lower than crude oil, and the trend enhanced with the extraction solvent polarity increasing, DPPH· scavenging rate of different refined oils were petroleum ether 75.94%, n-hexane 74.98%, isopropyl alcohol 75.38%, acetic ether 79.37%, ethanol 82.81%, respectively and soybean oil was 69.53%. Reducing power were petroleum ether 0.44, n-hexane 0.45, isopropyl alcohol 0.48, ethyl acetate 0.46, ethanol 0.52 respectively and soybean oil was 0.32. In addition, various oat oils antioxidant capacity were significantly higher than the soybean oil.