The Role of Water in Protection Against Thermal Deterioration of Liquid Margarine
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The thermal stability of liquid margarine and vegetable oils was investigated by measuring the oxidative stability index (OSI) at temperatures ranging from 90 to 180 °C, whereas total polar compounds (TPC) and tocopherols (vitamin E) were measured during heating at 180 °C in frying trays. Results showed that the OSI of liquid margarine was in the same range as the OSI of vegetable oils at lower temperatures, but at 160 and 180 °C, liquid margarine had significantly higher thermal stability, close to that observed for hard margarine and butter. The increased stability was confirmed by lower levels of TPC and a smaller relative reduction in vitamin E content during heating. Variations between different vegetable oils could partly be explained by differences in degree of saturation and level of vitamin E, with high oleic sunflower oil being the most stable oil at all temperatures. The water in liquid margarine vaporized within 1.5 min at 160 °C, and it is hypothesized that volatile pro-oxidants are removed with the water, inducing a delay in deterioration. The results indicate a role for water in preventing lipid oxidation and decomposition in fat emulsion products at 160–180 °C, suggesting that liquid margarine, low in saturated fat, may be the healthier and preferable alternative for pan-frying compared to other liquid vegetable oils.
KeywordsFrying Vegetable oils Liquid margarine Thermal stability
Relative number of double bonds
Design of experiments
Nuclear magnetic resonance
Oxidative stability index
Total polar compounds
The study was supported by grants from the Norwegian food company Mills DA and the Research Council of Norway. The funding is highly appreciated. Margarines, butter and vegetable oils were kindly provided by Mills DA, Norway. The authors also want to thank Marte Schei at SINTEF Fisheries and Aquaculture, Norway, for technical assistance.
Conflict of interest
Amandine Lamglait and Bente Kirkhus were employees at Mills DA when parts of the study were conducted.
- 4.US Department of Agriculture and US Department of Health and Human Services (2010) Dietary guidelines for Americans 2010. Goverment Printing Office, Washington DCGoogle Scholar
- 5.Nordic Nutrition Recommendations (2012). DOI: 10.6027/Nord2014-002
- 18.Lee CH, Yang SF, Peng CY, Li RN, Chen YC, Chan TF et al (2010) The precancerous effect of emitted cooking oil fumes on precursor lesions of cervical cancer. Int J Cancer 127(4):932–941Google Scholar
- 21.Soriguer F, Rojo-Martinez G, Dobarganes MC, Almeida JMG, Esteva I, Beltran M et al (2003) Hypertension is related to the degradation of dietary frying oils. Am J Clin Nutr 78(6):1092–1097Google Scholar
- 28.Firestone D (1998) Determination of polar compounds in frying fats. Method Cd 20-91. Official methods and recommended practices of the American Oil Chemists’ Society, 5th edn. AOCS Press, ChampaignGoogle Scholar
- 30.Sorland GH, Lundby F, Ukkelberg A (2007) Separation of two dimensional diffusion and relaxation time distributions from oil/fat moisture in food. In: Farhat IA, Belton PS, Webb GA (eds) Magnetic resonance in food science. The Royal Society of Chemistry (RSC Publishing), Cambridge, pp 189–196Google Scholar
- 32.Scheffé H (1958) Experiments of mixtures. J R Stat Soc, Ser. B 20:344–366Google Scholar
- 35.Firestone D (2004) Regulatory requirements in the frying industry. In: Gupta MK (ed) Frying technology and practices. AOCS Press, UrbanaGoogle Scholar
- 36.Fox R (2001) Regulation in the European Union. In: Rossell JB (ed) Frying, improving quality. Woodhead Publishing, CambridgeGoogle Scholar
- 39.Blumenthal MM (1991) A new look at the chemistry and physics of deep-fat frying. Food Technol 45(2):68Google Scholar
- 47.Kochhar SP (2001) The composition of frying oils. In: Rossell JB (ed) Frying improving quality. Woodhead Publishing Ltd, CambridgeGoogle Scholar