Volume 19, Issue 130 (2022)                   FSCT 2022, 19(130): 245-257 | Back to browse issues page


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1- PhD in Food Science and Industry, Department of Food Science and Industry, Islamic Azad University, Tehran Science and Research Unit, Tehran, Iran , leila.sedaghat65@yahoo.com
2- Department of Food Science and Industry, Islamic Azad University, Shahrekord Branch, Shahrekord, Iran.
3- Shahid Sadoughi University of Medical Sciences, Yazd, Iran
Abstract:   (767 Views)
One of the most important steps in the refining process for edible oils is the coloring step. Decolorization is an absorption process that involves the use of acid-activated clay to remove undesirable components of oil. Therefore, it is necessary to optimize the parameters of decolorization, mainly temperature, time and concentration of decolorizing soil in order to prevent adverse changes of the oil in the next stages and during storage. In this research, corn oil was selected and the effect of changing the dyeing parameters on the chemical properties of the oil was studied in order to optimize the process. For this purpose, the effect of time (15, 25, 35, 45 and 55 minutes), temperature (80, 90, 100, 110 and 120 degrees Celsius) and the concentration of soil-dye remover (0.4, 0.6, 0.8) , 1 and 1.2 percent) was investigated using the statistical design of the response level in 5 levels by the Central Composite Design method with the aim of reducing the consumption of soil-dye remover. The effect of decolorization parameters on oxidative stability (peroxide number, anisidine number, totox number, free fatty acid amount, Rancimet test and specific absorption at 232 nm and 270 nm), decolorization efficiency (carotenoid amount) and bioactive compounds (sterols amount) in Corn oil was studied. The results showed that after optimizing the best conditions for the decolorization stage in corn oil in order to minimize impurities, preserve bioactive compounds, and minimize the consumption of decolorizing soil, the time of decolorization was 35.59 minutes, the temperature was 103.61 degrees Celsius, and the soil concentration The dye was 1%, which was able to meet 57% of expectations. The practical results did not show any significant differences with the theoretical values ​​and confirmed these results.
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Article Type: Qualitative Research | Subject: Oil and products technology
Received: 2022/08/28 | Accepted: 2022/10/3 | Published: 2022/12/1

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