?Ultra-high oleic sunflower oil. Physicochemical characterization?

DI MARCO A.; PAN, L.; AÑON, MARÍA CRISTINA

Rosario

Congreso; World Congress of Oil & Fats and 31st IFS Lectureship Series. XI Congreso Latinoamericano de Grasas y Aceites; 2015

ULTRA-HIGH-OLEIC SUNFLOWER OIL: PHYSICOCHEMICAL CHARACTERIZATIONAndrea E. Di Marco1,*, Lucas G. Pan2, María C. Añón31Advanta Semillas S.A.I.C. Ruta 226 Km 60,5 (7620) Balcarce, Argentina. E-mail address: andrea.dimarco@advantaseeds.com2Advanta Semillas S.A.I.C. Ruta 226 Km 60,5 (7620) Balcarce, Argentina. E-mail address: lucas.pan@advantaseeds.com3Centro de Investigación y Desarrollo en Criotecnología de Alimentos (CIDCA-UNLP-CONICET), 47 y 116 (1900) La Plata, Argentina. E-mail address: mcacidca@gmail.comOxidative stability of oils is mainly influenced by the degree of unsaturation.Vegetable oils rich in linolenic acid, such as soybean and canola, are generally hydrogenated to increase their oxidative stability. As hydrogenation produces trans fatty acids, traditional breeding is used nowadays to create more stable oils.Conventional sunflower oil is prone to oxidation due to its high content of linoleic acid (around 60%). High oleic sunflower hybrids have an oxidative stability significantly better than the regular sunflower oil .In this context, Advanta Seeds has developed ultra-high-oleic sunflower hybrids (UHO), by using traditional breeding.The aim of this study was to make a multi-methodological characterization of ultra-high-oleic sunflower crude oil by measuring different parameters (fatty acids and triglycerides profiles, refractive index, oxidative stability index and tocopherols content) and to make a comparison with a high-oleic sunflower oil.The fatty acids profiles determined by gas-liquid chromatography showed that UHO hybrid has 92.5% and 1.1% of oleic and linoleicacids respectively, while HOSO has 86.5% of oleic and 6.5% of linoleic acids. As a consequence of its high content of oleic acid, UHO oil showed a predominance of OOO triglyceride, followed by SOO and POO in a lower extent.The oxidative stability index (OSI) of UHO measured by Rancimat at 110 and 120 °C was around 2.5 times higher than the OSI of HOSO. It agrees with the low content of linoleic acid present in UHO. Tocopherols content of UHO was in the range of most sunflower oils.The refractive index (RI) measured at 15, 20, 25 and 30 °C showed a linear correlation with the percentage of oleic acid between 86.5 and 92.5% oleic levels. These RI curves can be used as a first quick parameter to distinguish between HO and UHO oils. As a result of this work, it was possible to achieve a general characterization of a novel sunflower hybrid, which has demonstrated to have an improved oxidative stability. These results are really promising for future developments in food industry.Key words: ultra-high-oleic sunflower oil, oxidative stability