Abstract
The mixing of edible oils makes it possible to prevent lipid oxidation and preserve the nutritional and organoleptic quality of food. This study was conducted to determine the optimized blend ratio of groundnut (Arachis hypogea), olein, stearin, and sesame (Sesamum indicum L.) oils, to limit thermal oxidation of their lipids. The augmented simplex lattice design was used to study the effect of the edible oils (peanut, palm olein, palm stearin, and sesame oils) on the responses; peroxide value, thiobarbituric acid value, p-Anisidine value, iodine value, free fatty acid content, and total oxidation. The optimized blending oil proportions of peanut, olein, sesame, and stearin oils, were: 33.23%, 23.23%, 15.85%, and 27% respectively. Under this optimum condition, the following quality parameters were obtained: 1.75% oleic acid for the free fatty acid; 6.15 meq/kg for the peroxide value; 1.16 meq MDA/Kg for the thiobarbituric acid value; 55.39 g I2/100 g for the iodine value, 4.45 for the p-Anisidine value, and 19.85 for the total oxidation value. The resulting desirability was equal to 1. Thus, our results for the optimization indicate that the combination of oil makes it possible to best preserve the chemical quality of the lipids during heat treatments.
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