Journal of Thermal Analysis and Calorimetry

, Volume 108, Issue 2, pp 799–806 | Cite as

Kinetic evaluation of non-isothermal crystallization of oxidized extra virgin olive oil

  • Emma Chiavaro
  • Lorenzo Cerretani
  • Maria Paciulli
  • Stefano Vecchio


In this study, accelerated storage tests were carried out at 60 °C up to 20 weeks on three extra virgin olive oils (Evoos) with different total phenol contents and fatty acid compositions (named as EvooA, EvooB, and EvooC). Their oxidative statuses, evaluated by means of primary oxidation value and total phenolic content, were related to both the shapes of differential scanning calorimetry (DSC) cooling curves and thermal properties. DSC cooling curves were all deconvoluted as crystallization occurs in a quite narrow range, and the single steps are not well separated. The first deconvoluted DSC peak for the three samples tested, which occurs in the temperature interval between −45 °C and −30 °C, can probably be ascribable to the crystallization of tri-unsaturated triacylglycerols. A non-isothermal crystallization kinetic procedure, derived by the well-known isothermal Avrami equation, combined with the method of Ozawa, was applied to the first deconvoluted DSC peak only by processing the data related to this DSC peak. Results of the modified Avrami method were found in agreement with those of the Ozawa method. In particular, Avrami and Ozawa's exponents lie from 2 to 4 (being those of fresh samples always lower than those subjected to the accelerated oxidation test). Crystallization is relatively slow for fresh samples whereas after the first 4 weeks; it occurs faster in EvooB and EvooC.


Extra virgin olive oil Differential scanning calorimetry Non-isothermal crystallization kinetics Ozawa-Avrami method 



The authors gratefully acknowledge the assistance of Dr. Alessandra Bendini (university of Bologna) for the treatment of chemical data.


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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2011

Authors and Affiliations

  • Emma Chiavaro
    • 1
  • Lorenzo Cerretani
    • 2
  • Maria Paciulli
    • 1
  • Stefano Vecchio
    • 3
  1. 1.Dipartimento di Ingegneria IndustrialeUniversità degli Studi di ParmaParmaItaly
  2. 2.Dipartimento di Economia e Ingegneria AgrarieUniversità di BolognaCesenaItaly
  3. 3.Dipartimento di Scienze di Base e Applicate all’IngegneriaRomeItaly

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