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A kinetic study of oil deterioration during frying and a comparison with heating

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Journal of the American Oil Chemists' Society

Abstract

The thermooxidative alterations of cottonseed oil during frying of potato chips without oil turnover, in a temperature range of 155–195°C, were studied. The results showed that the content of polar compounds, conjugated dienes, conjugated trienes, and p-anisidine value (p-AV) increased linearly with the time of frying at a rate depending on temperature. The rate constants showed a significant but low increase with temperature, except for the rate constant of conjugated trienes that was not correlated to frying temperature. The alterations induced by heating the oil were also measured and compared with those observed in frying at the same temperature. The major difference observed between frying and heating was related to the p-AV increase, which presented a considerably higher rate during heating. The FA content, as a function of process time during frying at 185°C, showed a significant increase in palmitic acid (C16∶0) and a significant decrease in linoleic acid (C18∶2). Oleic acid (C18∶1) also showed a small but significant decrease. The same results were obtained for the oil heated at 185°C. Examination of p-AV or conjugated dienes with polar compounds showed that both p-AV and conjugated dienes had a linear relationship with total polar compounds, with correlation coefficients of 0.946 and 0.862, respectively.

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Authors and Affiliations

  1. Department of Chemical Engineering, Laboratory of Food Chemistry and Technology, National Technical University of Athens, GR 15780, Athens, Greece

    Dimitra P. Houhoula, Vassiliki Oreopoulou & Constantina Tzia

Authors
  1. Dimitra P. Houhoula
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  2. Vassiliki Oreopoulou
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  3. Constantina Tzia
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Correspondence to Vassiliki Oreopoulou.

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Houhoula, D.P., Oreopoulou, V. & Tzia, C. A kinetic study of oil deterioration during frying and a comparison with heating. J Amer Oil Chem Soc 79, 133–137 (2002). https://doi.org/10.1007/s11746-002-0447-0

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  • DOI: https://doi.org/10.1007/s11746-002-0447-0

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