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Absorption in rats of rapeseed, soybean, and sunflower oils before and following moderate heating

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Lipids

Abstract

Rapeseed, soybean, and sunflower oil were heated for 15 min in a 5-mm oil layer in a pan at 180°C. The fatty acid composition was almost unaffected by heating, while the polymer content rose slightly and the tocopherol content decreased, except in soybean oil. The absorption of oils before and after heating was investigated in lymph-cannulated rats. Oils were administered as emulsions through a gastrostomy tube and lymph was collected during the next 24 h. The highest accumulated lymphatic transport of total fatty acids was observed after administration of rapeseed oil, and the lowest after heated sunflower oil. The accumulated transport was similar for all unheated oils. The transport of fatty acids was significantly lower in rats receiving heated oil compared to those receiving the corresponding unheated oil. Small increases in polymers may have contributed to the decreased lymphatic transport of oil following heating, although this probably does not fully explain the effect. The absorption of sunflower oil was more affected by heating than the absorption of soybean or rapeseed oil. Furthermore, the largest decrease in total activity of tocopherols following heating was observed in sunflower oil. Overall, these results demonstrate that the absorption of vegetable oils is affected by moderate heating.

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Abbreviations

HPLC:

high-performance liquid chromatography

RO:

rapeseed oil

SOO:

soybean oil

SUO:

sunflower oil

α-TE:

α-tocopherol equivalent

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Authors and Affiliations

  1. Department of Biochemistry and Nutrition, The Technical University of Denmark, Building 224, DK-2800, Lyngby, Denmark

    Trine Porsgaard & Carl-Erik Høy

  2. Department of Biotechnology, The Technical University of Denmark, 2800, Lyngby, Denmark

    Hong Zhang

  3. Department of Biotechnological Institute, 6000, Kolding, Denmark

    Robert G. Nielsen

Authors
  1. Trine Porsgaard
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  2. Hong Zhang
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  3. Robert G. Nielsen
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  4. Carl-Erik Høy
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Correspondence to Carl-Erik Høy.

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Porsgaard, T., Zhang, H., Nielsen, R.G. et al. Absorption in rats of rapeseed, soybean, and sunflower oils before and following moderate heating. Lipids 34, 727–732 (1999). https://doi.org/10.1007/s11745-999-0419-z

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  • DOI: https://doi.org/10.1007/s11745-999-0419-z

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