English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/128031
Compartir / Impacto:
Estadísticas
Add this article to your Mendeley library MendeleyBASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Título

Inhibition of hydroperoxy-, keto- and hydroxy-FAME by alpha- and delta-tocopherol at Rancimat conditions

AutorMarmesat, Susana ; Morales, Arturo ; Ruiz Méndez, Mª Victoria ; Márquez Ruiz, Gloria ; Velasco, Joaquín
Palabras claveTocopherol
Rancimat
Hydroxydienes
Ketodienes
Hydroperoxides
Fecha de publicación2015
EditorAmerican Oil Chemists' Society
CitaciónJAOCS, Journal of the American Oil Chemists' Society 93: 93- 103 (2015)
ResumenThe effects of alpha- and delta-tocopherol on inhibition of hydroperoxides, keto and hydroxy compounds at Rancimat conditions, i.e. 100 ºC and air bubbling, were studied in samples of fatty acid methyl esters (FAME) obtained from high linoleic (HL) and high oleic (HO) sunflower oils. Simple hydroperoxides from methyl linoleate and oleate and keto and hydroxy compounds derived from methyl linoleate hydroperoxides were analyzed by HPLC-UV-ELS. Different tocopherol concentrations, namely, 10, 50, 100, 500 and 1000 mg/kg, were tested. Irrespective of the lipid substrate and the initial concentration of tocopherol, results showed that the content of hydroperoxides accumulated during the induction period was remarkably higher in the samples containing delta-tocopherol. The relative concentrations of oleate hydroperoxides in the HO samples were also higher in the presence of delta-tocopherol. Alpha-tocopherol was more effective in inhibiting hydroperoxides at low levels, being 100 mg/kg its optimal concentration, while delta-tocopherol displayed optimal protection at 1000 mg/kg. Under the oxidation conditions applied, neither alpha- nor delta-tocopherol showed a protective effect on hydroperoxide decomposition at any level assayed. Formation of keto- and hydroxy-dienes was more related to the concentration of their hydroperoxide precursors. Furthermore, both tocopherols gave rise to increased concentrations of ketodienes at 500 and 1000 mg/kg compared to the controls. Such an effect was more pronounced for alpha-tocopherol and in the HL samples.
URIhttp://hdl.handle.net/10261/128031
DOI10.1007/s11746-015-2748-7
Identificadoresdoi: 10.1007/s11746-015-2748-7
issn: 0003-021X
Aparece en las colecciones: (IG) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
Postprint_2016_JAOCS_V93_P93.pdf1,17 MBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 

Artículos relacionados:


NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.