Effect of the soil nature on selected chemico-physical and thermal parameters of extra virgin olive oils from cv Chemlali

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M. Ben Rached
M. Paciulli
A. Pugliese
M. Abdallah
D. Boujnah
M. Zarrouk
M. Guerfel
E. Chiavaro


Composition, DSC, Extra virgin olive oil, Physical properties, Soil


In this study the effect of different soils (clay, EVOOsC, stony, EVOOsS, brown, EVOOsB, limestone and gypsum, EVOOsLG) on the chemico-physical (free acidity, peroxide value, oxidative stability, fatty acids, pigments, colour, viscosity, heat capacity) and thermal (upon DSC) quality of  four Chemlali extra virgin olive oils was evaluated. EVOOsC showed the lowest peroxide value, the highest amount of monounsaturated fatty acids and the narrowest crystallization range. EVOOsLG had the highest content of saturated and polyunsaturated fatty acids, the lowest stability to oxidation and melting enthalpy. EVOOsS and EVOOsB showed the highest viscosity, while the heat capacity measurement didn’t show any difference among the oils. EVOOsB exhibited the highest b* colour parameter in relation with the highest carotenoids content. These preliminary findings showed that the nature of the soil has an effect on the final quality of EVOO, as also revealed by the PCA analysis.

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