title: Differential scanning calorimetry: a potential tool for discrimination of olive oil commercial categories.
abstract: Differential scanning calorimetry thermograms of five commercial categories of olive oils (extra virgin olive oil, olive oil, refined olive oil, olive-pomace oil and refined olive-pomace oil) were performed in both cooling and heating regimes. Overlapping transitions were resolved by deconvolution analysis and all thermal properties were related to major (triacylglycerols, total fatty acids) and minor (diacylglycerols, lipid oxidation products) chemical components. All oils showed two well distinguishable exothermic events upon cooling. Crystallization enthalpies were significantly lower in olive oils due to a more ordered crystal structure, which may be related to the higher triolein content. Pomace oils exhibited a significantly higher crystallization onset temperature and a larger transition range, possibly associated to the higher amount of diacylglycerols. Heating thermograms were more complex: all oils exhibited complex exo- and endothermic transitions that could differentiate samples especially with respect to the highest temperature endotherm. These preliminary results suggest that both cooling and heating thermograms obtained by means of differential scanning calorimetry may be useful for discriminating among olive oils of different commercial categories.
authors: Dipartimento di Ingegneria Industriale, Università degli Studi di Parma, viale Usberti 181/A, I-43100, Parma, Italy. emma.chiavaro@unipr.it
authors: Emma
authors: E
authors: Chiavaro
authors: Maria Teresa
authors: MT
authors: Rodriguez-Estrada
authors: Carlo
authors: C
authors: Barnaba
authors: Elena
authors: E
authors: Vittadini
authors: Lorenzo
authors: L
authors: Cerretani
authors: Alessandra
authors: A
authors: Bendini
mesh_terms: D002152:Calorimetry, Differential Scanning / Q000379:methods; D000069463:Olive Oil; D010938:Plant Oils / Q000032:analysis* / Q000145:classification; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013696:Temperature; D013816:Thermodynamics
chemical_list: D000069463:Olive Oil; D010938:Plant Oils