Evaluation of the Effects of Different Factors on Oxidation of Soybean Oil by Response Surface Methodology

Abstract

In this study, the effects of temperature (30, 50 ve 70 °C), time (0, 10 ve 20 days), concentration of copper and iron ions (0, 0.15 ve 0.3 mg kg-1 oil) and ascorbyl palmitate (AP) (0, 200 ve 400 mg kg-1 oil) on peroxide value (PV), malonaldehyde (MAD) and hexanal (HEX) content of soybean oil under accelerated oxidation conditions have been evaluated by response surface method (RSM). Besides of its rich linoleic acid (C18: 2) content (55.81%), soybean oil had 8.69% linolenic acid (C18: 3). The total tocopherol content of soybean oil was 538.5 mg kg-1 oil. Data obtained showed that temperature and time significantly increased (P<0.05) PV, MAD and HEX content of the samples. AP significantly decreased the formation of peroxides (P<0.05). Samples with copper showed higher PV and HEX values compared to those with iron. In general, the presence of copper and iron did not significantly (P>0.05) affect the oxidation. It’s concluded that temperature and time were the most important parameters affecting soybean oil oxidation (P<0.05). In addition to the reduced number of experimental runs, RSM provided an overall evaluation of the effects of different factors on oxidation parameters. © 2017, Centenary University. All rights reserved.