نبذة مختصرة : The aim of this study is to investigate the ability of oleuropein-rich olive leaf extract (OLE) to improve the quality and oxidative stability of sunflower oil subjected to accelerated thermal oxidation. Oleuropein was the major phenolic compound determined by HPLC-DAD with a content ranging from 20.81 to 32.56 mg·g-1of dry extract (DE). The evaluation of thein vitroantioxidant capacity of OLE showed good scavenging capacity of the 2,2-diphenyl-1-picrylhydrazyl radical (DPPH) and hydrogen peroxide (H2O2) (1.01 and 0.96 mmol Trolox equivalents (ET·g-1DE, respectively). The enrichment of sunflower oil with 0.1, 0.25 and 0.5% OLE (w/v) significantly inhibited thermal-induced peroxidation in a dose-dependent fashion. 0.25% OLE was the most effective concentration and showed a significant reduction in peroxide value and conjugated dienes by 61.4 and 17.4%. These results indicate that OLE can be considered a good natural alternative for extending the shelf-life of polyunsaturated vegetable oils. ; El objetivo de este estudio es investigar la capacidad del extracto de hoja de olivo (EHO) rico en oleuropeína para mejorar la calidad y la estabilidad oxidativa del aceite de girasol sometido a oxidación térmica acelerada. La oleuropeína fue el compuesto fenólico mayoritario determinado por HPLC-DAD con un contenido que varió de 20,81 a 32,56 mg·g-1de extracto seco (ES). La evaluación de la capacidad antioxidante in vitro de EHO mostró una buena capacidad de captura del radical 2,2-difenil-1-picrilhidrazilo (DPPH) y peróxido de hidrógeno (H2O2) (1,01 y 0,96 mmol Trolox equivalentes (ET·g-1ES, respectivamente). El enriquecimiento de aceite de girasol con 0,1, 0,25 y 0,5 % de EHO (p/v) inhibió significativamente la peroxidación inducida térmicamente de forma dependiente de la dosis. El EHO al 0,25 % fue la concentración más eficaz que mostró una reducción significativa del índice de peróxido y dienos conjugados en un 61,4 % y un 17,4 %. Estos resultados indican que el EHO puede considerarse una buena alternativa natural para ...
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