The effect of fatty acid profile on the stability of non-traditional and traditional plant oils
Keywords:plant oil, autooxidation, oxidative stability, fatty acid, Schaal test
The effect of fatty acid composition on the autoxidation of selected plant oils (rapeseed (canola) oil, corn oil, frying oil, grapeseed oil, pomace olive oil, rice bran oil, sunflower oil and high oleic sunflower oil) during their storage was studied. Oils were purchased in retail food stores. Oxidative stability of plant oils was monitored during the storage under the Schaal test conditions at 60 °C in 100 mL beakers and the dark for 40 days. The weight changes, the peroxide and acid values were analysed during the storage. Changes in the composition of fatty acids were analyzed by the gas chromatography-mass spectrometry. The results obtained by monitoring the weight changes of oils correlated with their peroxide values. The induction period in case of grapeseed and sunflower oils was 27 and 28 days respectively. The induction period for frying and rapeseed oils were around 35 days. The remaining four oils had induction periods over 40 days. The acid values at the end of experiment correspond to both the relative weight gain and the the peroxide values. The stability of oils depended mainly on the degree of fatty acids unsaturation. A strong negative correlation between oleic acid content and oil stability expressed as the peroxide value was found. The significant positive correlation was found in case of linoleic acid. The relative content of polyunsaturated fatty acids decreased during the storage while the content of saturated and monounsaturated fatty acids increased. The highest relative increase in oleic acid was found at the least stable oils, grapeseed and sunflower oils, by 37.5% and 25.3% respectively. The initial content of free fatty acids monitored by the acid value did not affect the oxidation rate. With consideration to all monitored parameters the grapeseed and the sunflower oils were the least stable. The most stable ones were olive pomace and high oleic sunflower oils.
Angelovič, M., Jablonický, J., Tkáč, Z., Angelovič, M. 2015. Oxidative stability of fatty acid alkyl esters: A review. Potravinarstvo, vol. 9, no. 1, p. 417-426. https://doi.org/10.5219/500
Firestone, D. 2005. Olive oil. In Shahidi F Bailey's Industrial Oil and Fat Products (6th Edition). New Jersey : John Wiley & Sons. p. 213-267 ISBN: 978-0-471-38460-1.
Foster, R., Williamson, C. S., Lunn, J. 2009. Culinary oils and their health effects. Nutrition Bulletin, vol. 34, no. 1, p. 4-47. https://doi.org/10.1111/j.1467-3010.2008.01738.x
Guillen, M. D., Cabo, N. 2002. Fourier transform infrared spectra data versus peroxide and anisidine values to determine oxidative stability of edible oils. Food Chemistry, vol. 77, no. 4, p. 503-510. https://doi.org/10.1016/S0308-8146(01)00371-5
Gunstone, F. D. 2005. Vegetable oils. In Shahidi F. Bailey's Industrial Oil and Fat Products (6th Edition). New Jersey : John Wiley & Sons. p. 213-267 ISBN: 978-0-471-38460-1.
Choe, E., Min, D. B. 2006. Mechanisms and factors for edible oil oxidation. Comprehensive reviews in food science and food safety, vol. 5, no. 4, p. 169-186. https://doi.org/10.1111/j.1541-4337.2006.00009.x
ISO 3960:2017. Animal and vegetable fats and oils – Determination of peroxid value – Iodometric (visual) endpoint determination.
ISO 660:2009. Animal and vegetable fats and oils – Determination of acid value and acidity.
Kamal-Eldin, A. 2006. Effect of fatty acids and tocopherols on the oxidative stability of vegetable oils. European Journal of Lipid Science and Technology, vol. 108, no. 12, p. 1051-1061. https://doi.org/10.1002/ejlt.200600090
Matthäus, B. 2010. Oxidation of edible oils. In Decker, E., Elias, R., McClements, D. J. Oxidation in Foods and Beverages and Antioxidant Applications. Management in Different Industry Sectors. Cambridge : Woodhead Publishing. p. 183-238. ISBN: 978-1-84569-983-3. https://doi.org/10.1533/9780857090331.2.183
Silva, L., Pinto, J., Carrola, J., Paiva-Martins, F. 2010. Oxidative stability of olive oil after food processing and comparison with other vegetable oils. Food Chemistry, vol. 121, no. 4, p. 1177-1187. https://doi.org/10.1016/j.foodchem.2010.02.001
Smith, S. A., King, R. E., Min, D. B. 2007. Oxidative and thermal stabilities of genetically modified high oleic sunflower oil. Food Chemistry, vol. 102, no. 4, p. 1208-1213. https://doi.org/10.1016/j.foodchem.2006.06.058
Velíšek J. 2014. The Chemistry of Food. 1st ed. Chichester, UK : Wiley-Blackwell, 1124 p. ISBN: 978-1-118-38381-0.
Žabčíková, S., Červenka, L. 2015. Modified carbon paste electrode as a tool for the evaluation of oxidative stability of rapeseed oil. Potravinarstvo, vol. 9, no. 1, p. 347-351. https://doi.org/10.5219/432
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