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A kinetic study on the formation of hydroperoxy-, keto- and hydroxy-dienes in FAMEs derived from sunflower oils

Arturo Morales,M. Carmen Dobarganes,Gloria Márquez‐Ruiz,Joaquı́n Velasco-2011-09-19-DIGITAL.CSIC (Spanish National Research Council (CSIC))
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TL;DRAbstract

The main objective of this work was to study the kinetic of formation of the main oxidation products of linoleic acid ¿hydroperoxy-, keto- and hydroxy-dienes¿ in fatty acid methyl esters (FAMEs) obtained from high-linoleic (HL) and high-oleic (HO) sunflower oils. The influence of temperature (40, 60 and 80ºC) and the addition of alpha-tocopherol (0, 500 mg/kg) on the formation of these compounds were studied. Quantitative analysis of hydroperoxy-, keto- and hydroxy-dienes was carried out by HPLC-UV. In addition, the peroxide value (PV) by iodometric titration and, when indicated, the content of alpha-tocopherol by HPLC-FLD were also determined. Monomolecular rate constants found for hydroperoxydienes ranged from 1¿10-3 to 27¿10-3 mol1/2mol-1/2h-1, while bimolecular rate constants ranged from 0.02 to 0.9 h-1 in the range of temperatures studied. The relationship between hydroperoxydienes and the PV was linear and unaffected by temperature. Results indicated that hydroperoxydienes consti

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The main objective of this work was to study the kinetic of formation of the main oxidation products of linoleic acid ¿hydroperoxy-, keto- and hydroxy-dienes¿ in fatty acid methyl esters (FAMEs) obtained from high-linoleic (HL) and high-oleic (HO) sunflower oils. The influence of temperature (40, 60 and 80ºC) and the addition of alpha-tocopherol (0, 500 mg/kg) on the formation of these compounds were studied. Quantitative analysis of hydroperoxy-, keto- and hydroxy-dienes was carried out by HPLC-UV. In addition, the peroxide value (PV) by iodometric titration and, when indicated, the content of alpha-tocopherol by HPLC-FLD were also determined. Monomolecular rate constants found for hydroperoxydienes ranged from 1¿10-3 to 27¿10-3 mol1/2mol-1/2h-1, while bimolecular rate constants ranged from 0.02 to 0.9 h-1 in the range of temperatures studied. The relationship between hydroperoxydienes and the PV was linear and unaffected by temperature. Results indicated that hydroperoxydienes consti

Keywords

ChemistryIodometryLinoleic acidSunflower oilSunflowerPeroxide valueOrganic chemistryPeroxide

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