Nutritional Effects of Fresh, Laboratory Heated, and Pressure Deep-Fry Fats

Authors

  • J. C. ALEXANDER,

    1. Author Alexander is affiliated with the Dept, of Nutrition, and Author Moran, Dept. of Animal & Poultry Science, Univ. of Guelph, Guelph, Ontario, N1G 2W1, Canada. Author Chanin, formerly with the Dept. of Nutrition, Univ. of Guelph, is now affiliated with the Dept. of Veterinary Physiological Sciences, Univ. of Saskatchewan, Saskatoon, Saskatchewan, S7N OWO, Canada.
    Search for more papers by this author
  • B. E. CHANIN,

    1. Author Alexander is affiliated with the Dept, of Nutrition, and Author Moran, Dept. of Animal & Poultry Science, Univ. of Guelph, Guelph, Ontario, N1G 2W1, Canada. Author Chanin, formerly with the Dept. of Nutrition, Univ. of Guelph, is now affiliated with the Dept. of Veterinary Physiological Sciences, Univ. of Saskatchewan, Saskatoon, Saskatchewan, S7N OWO, Canada.
    Search for more papers by this author
  • E. T. MORAN

    1. Author Alexander is affiliated with the Dept, of Nutrition, and Author Moran, Dept. of Animal & Poultry Science, Univ. of Guelph, Guelph, Ontario, N1G 2W1, Canada. Author Chanin, formerly with the Dept. of Nutrition, Univ. of Guelph, is now affiliated with the Dept. of Veterinary Physiological Sciences, Univ. of Saskatchewan, Saskatoon, Saskatchewan, S7N OWO, Canada.
    Search for more papers by this author

  • This work was supported by the Natural Sciences & Engineering Research Council of Canada, and the Ontario Ministry of Agriculture and Food.

ABSTRACT

Cooking fats from a pressure deep-fat frying operation producing fried chicken, were compared with laboratory heated and fresh fats in the diets of animals. Included were corn oil (CO), peanut oil (PO), and partially hydrogenated soybean oil (HSBO). Weanling rats were fed diets containing 15% fat for 28 days. Laboratory heating reduced absorption of CO and PO, but not that of HSBO. Pressure deep-frying increased absorption of HSBO. Animals derived less metabolizable energy from diets containing heated or hydrogenated fats relative to fresh oil. Polar lipid fractions of liver changed due to heating. Pressure deep-frying with fats resulted in less deterioration than with laboratory heating, as shown by chemical analyses, coefficient of digestibility, and metabolizable energy studies.

Ancillary