The oxidation of virgin olive oil leads to the degradation of pigments, which are responsible for oil colour, and to the formation of new compounds absorbing in the UV-Vis spectral range and thus contributing to the colour changes. Therefore, colour can be a critical tool for oil quality assessment and for monitoring the changes occurring during storage. The aim of this study was to evaluate the correlations between the colour parameters, measured as ΔE (colour difference between fresh oil sample and the samples stored in different conditions and for a certain period of time), and some important analytical indexes measured during a storage period of 12 months in different conditions. The obtained results showed significant regression coefficients for the correlations between the colour parameters and the concentrations of chlorophylls, carotenoids and triglyceride oligopolymers, as well as with the K270 values.
Determination of oil colour during storage: a tool for a rapid quality assessment
CAPONIO, Francesco;PASQUALONE, Antonella;GOMES, Tommaso Francesco;SUMMO, CARMINE
2007-01-01
Abstract
The oxidation of virgin olive oil leads to the degradation of pigments, which are responsible for oil colour, and to the formation of new compounds absorbing in the UV-Vis spectral range and thus contributing to the colour changes. Therefore, colour can be a critical tool for oil quality assessment and for monitoring the changes occurring during storage. The aim of this study was to evaluate the correlations between the colour parameters, measured as ΔE (colour difference between fresh oil sample and the samples stored in different conditions and for a certain period of time), and some important analytical indexes measured during a storage period of 12 months in different conditions. The obtained results showed significant regression coefficients for the correlations between the colour parameters and the concentrations of chlorophylls, carotenoids and triglyceride oligopolymers, as well as with the K270 values.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
