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Effect of oil replenishment during deep-fat frying of frozen foods in sunflower oil and high-oleic acid sunflower oil

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Journal of the American Oil Chemists' Society

Abstract

Frying stability of sunflower oil (SO) with 23% oleic acid and 61% linoleic acid, and of high-oleic acid sunflower oil (HOSO) with 74% oleic acid and 13% linoleic acid was studied during 20 discontinuous deep-fat fryings of various frozen foods, with or without frequent replenishment of the used oil with fresh oil. Alterations of both oils were measured by column, gas-liquid and high-performance size-exclusion chromatography. Total polar content and compounds, related to thermoxidative changes, and diacylglycerides, related to hydrolytic changes, increased in all oils during frying but reached higher levels in SO than in HOSO. Nevertheless, the increased levels of diacylglycerides observed may result from the frozen potatoes prefried in palm oil. Oleic acid in HOSO and linoleic acid in SO significantly decreased, but the fatty acid modifications that occurred during the repeated fryings were not only related to thermoxidative alteration but also to interactions between the bath oil and the fat in the fried products. Data from this study also indicated that HOSO performed more satisfactorily than SO in repeated fryings of frozen foods. Moreover, frequent addition of fresh oil throughout the deep-frying process minimized thermoxidative and hydrolytic changes in the frying oils and extended the frying life of the oils.

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Authors and Affiliations

  1. Instituto de Nutrición y Bromatología (CSIC-UCM), Facultad de Farmacia, Universidad Complutense, E-28040, Madrid, Spain

    Antonio Romero & Carmen Cuesta

  2. Departamento de Nutrición Bromatología I (Nutrición), Sección Lípidos, Facultad de Farmacia, Universidad Complutense, E-28040, Madrid, Spain

    Francisco J. Sánchez-Muniz

Authors
  1. Antonio Romero
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  2. Carmen Cuesta
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  3. Francisco J. Sánchez-Muniz
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Correspondence to Carmen Cuesta.

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Romero, A., Cuesta, C. & Sánchez-Muniz, F.J. Effect of oil replenishment during deep-fat frying of frozen foods in sunflower oil and high-oleic acid sunflower oil. J Amer Oil Chem Soc 75, 161–167 (1998). https://doi.org/10.1007/s11746-998-0028-5

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  • DOI: https://doi.org/10.1007/s11746-998-0028-5

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