Utilization of high‐oleic rapeseed oil for deep‐fat frying of French fries compared to other commonly used edible oils

Changes in chemical, physical and sensory parameters of high-oleic rapeseed oil (HORO) (NATREON™) during 72 h of deep-fat frying of potatoes were compared with those of commonly used frying oils, palm olein (PO), high-oleic sunflower oil (HOSO) and partially hydrogenated rapeseed oil (PHRO). In addition to the sensory evaluation of the oils and the potatoes, the content of polar compounds, oligomer triacylglycerols and free fatty acids, the oxidative stability by Rancimat, the smoke point and the anisidine value were determined. French fries obtained with HORO, PO and HOSO were still suitable for human consumption after 66 h of deep-fat frying, while French fries fried in PHRO were inedible after 30 h. During the frying period, none of the oils exceeded the limit for the amount of polar compounds, oligomer triacylglycerols and free fatty acids recommended by the German Society of Fat Science (DGF) as criteria for rejection of used frying oils. After 72 h, the smoke point of all oils was below 150 °C, and the amount of tocopherols was reduced to 5 mg/100 g for PHRO and 15 mg/100 g for HORO and HOSO. Remarkable was the decrease of the oxidative stability of HOSO measured by Rancimat. During frying, the oxidative stability of this oil was reduced from 32 h for the fresh oil to below 1 h after 72 h of frying. Only HORO showed still an oxidative stability of more than 2 h. From the results, it can be concluded that the use of HORO for deep-fat frying is comparable to other commonly used oils.

[1]  W. Nawar Volatile components of the frying process , 1998 .

[2]  Chi-Tang Ho,et al.  Chemical reactions involved in the deep-fat frying of foods1 , 1978 .

[3]  V. Gergis,et al.  Quality changes of Moringa oleífera , variety Mbololo of Kenya, seed oil during frying. , 1999 .

[4]  W. Neff,et al.  Low-linolenic acid soybean oil—Alternatives to frying oils , 1994 .

[5]  G. Assmann,et al.  Effects of dietary fatty acids on the composition and oxidizability of low-density lipoprotein , 2002, European Journal of Clinical Nutrition.

[6]  T. P. Pantzaris Comparison of monounsaturated and polyunsaturated oils in continuous frying , 1998 .

[7]  Xin-Qing Xu,et al.  Chemical and physical analyses and sensory evaluation of six deep-frying oils , 1999 .

[8]  M. Augustin,et al.  Efficacy of the antioxidants BHA and BHT in palm olein during heating and frying , 1983 .

[9]  K. Warner,et al.  Effect of fatty acid composition of oils on flavor and stability of fried foods , 1997 .

[10]  E. Trautwein,et al.  Replacing Saturated Fat with PUFA-Rich (Sunflower Oil) or MUFA-Rich (Rapeseed, Olive and High-Oleic Sunflower Oil) Fats Resulted in Comparable Hypocholesterolemic Effects in Cholesterol-Fed Hamsters , 1999, Annals of Nutrition and Metabolism.

[11]  M. Gordon,et al.  Effect of antioxidants on losses of tocopherols during deep-fat frying , 1995 .

[12]  D. Firestone,et al.  Official methods and recommended practices of the American Oil Chemists' Society , 1990 .

[13]  D. Precht,et al.  Trans fatty acids: implications for health, analytical methods, incidence in edible fats and intake (a review). , 1995, Die Nahrung.

[14]  L. Ovesen,et al.  The influence of trans fatty acids on health: a report from the Danish Nutrition Council. , 1995, Clinical science.