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Título: | Antioxidant effect of phenolic compounds, α-tocopherol, and other minor components in virgin olive oil |
Autor: | Mateos, Raquel CSIC ORCID ; Domínguez, Manuel M.; Espartero, José L.; Cert, Arturo CSIC | Fecha de publicación: | 2003 | Editor: | American Chemical Society | Citación: | Journal of Agricultural and Food Chemistry 51(24): 7170-7175 (2003) | Resumen: | The effect of acidity, squalene, hydroxytyrosol, aldehydic form of oleuropein aglycon, hydroxytyrosyl acetate, tyrosol, homovanillic acid, luteolin, apigenin, α-tocopherol, and the mixtures hydroxytyrosol/hydroxytyrosyl acetate, hydroxytyrosol/tyrosol, and hydroxytyrosol/α-tocopherol on the oxidative stability of an olive oil matrix was evaluated. A purified olive oil was spiked with several concentrations of these compounds and, then, subjected to an accelerated oxidation in a Rancimat apparatus at 100 °C. Acidity, squalene, homovanillic acid, and apigenin showed negligible effect. At the same millimolar concentrations, the different o-diphenolic compounds yielded similar and significant increases of the induction time, α-tocopherol a lesser increase, and tyrosol a scarce one. At low concentrations of o-diphenols and α-tocopherol, a linear relationship between induction time and concentration was found, but at high concentrations the induction time tended toward constant values. To explain this behavior, a kinetic model was applied. The effect of the mixtures hydroxytyrosol/hydroxytyrosyl acetate was similar to that of a single o-diphenol at millimolar concentration equal to the sum of millimolar concentrations of both compounds. Concentrations of tyrosol >0.3 mmol/kg increase the induction time by 3 h. The mixtures hydroxytyrosol/α-tocopherol showed opposite effects depending on the relative concentrations of both antioxidants; so, at hydroxytyrosol concentrations <0.2 mmol/kg, the addition of α-tocopherol increased the induction time, whereas at higher hydroxytyrosol concentrations, the α-tocopherol diminished the stability. | Versión del editor: | https://doi.org/10.1021/jf034415q | URI: | http://hdl.handle.net/10261/241039 | DOI: | 10.1021/jf034415q | ISSN: | 0021-8561 |
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