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Changes in the characteristics and composition of oils during deep-fat frying

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Journal of the American Oil Chemists’ Society

Abstract

Refined, bleached, and deodorized soybean oil and vanaspati (partially hydrogenated vegetable oil blend consisting of peanut, cottonseed, nigerseed, palm, rapeseed, mustard, rice bran, soybean, sunflower, corn, safflower, sesame oil, etc., in varying proportions) were used for deep-fat frying potato chips at 170, 180, and 190°C. Refractive index, specific gravity, color, viscosity, saponification value, and free fatty acids of soybean oil increased with frying temperature, whereas the iodine value decreased. The same trend was observed in vanaspati, but less markedly than in soybean oil, indicating a lesser degree of deterioration. Iodine values of soybean oil and vanaspati decreased from their initial values of 129.8 and 74.7 to 96.2 and 59.6, respectively, after 70 h of frying. Polyunsaturated fatty acids decreased in direct proportion to frying time and temperature. Losses were highest in soybean oil with a 79% decrease in trienoic acids and a 60% decrease in dienoic acids. Levels of nonurea adduct-forming esters were proportional to the losses of unsaturated fatty acids. Butylated hydroxyanisole and tertiary butylhydroquinone did not affect deterioration of soybean oil at frying temperatures.

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Authors and Affiliations

  1. Department of Oil and Paint Technology, H.B. Technological Institute, 208 002, Kanpur, India

    V. K. Tyagi & A. K. Vasishtha

Authors
  1. V. K. Tyagi
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  2. A. K. Vasishtha
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Tyagi, V.K., Vasishtha, A.K. Changes in the characteristics and composition of oils during deep-fat frying. J Amer Oil Chem Soc 73, 499–506 (1996). https://doi.org/10.1007/BF02523926

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  • DOI: https://doi.org/10.1007/BF02523926

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