Accelerated oxidation tests, such as the determination of the induction period, increase the lipid oxidation rate by exposing a food to elevated temperatures, in the presence of excess quantities of air or oxygen. In addition to the well-founded oxidative stability index (OSI) method, an innovative and promising technique is the oxidation test (OXITEST) reactor. A new analytical method was developed with OXITEST to oxidize vegetable oils. At a preliminary stage of the investigation, the induction periods of sunflower and extra-virgin olive oil obtained by the OXITEST reactor were plotted against temperature, on the basis of the Arrhenius law; the activation energy and the frequency factor of lipid oxidation were calculated and resulted, respectively, in 98.61 kJ/mol and 2.3361010 s–1 for sunflower oil and 106.48 kJ/mol and 6.2761010 s–1 for extra-virgin olive oil. The new oxidative technique was employed to determine the induction periods of vegetable oils; the results obtained were well correlated with those achieved with OSI technology, with a Pearson correlation coefficient r = 0.9785 (p ,0.05) for oilseeds and palm oil and r = 0.9501 (p ,0.05) for extra-virgin olive oils.

Accelerated oxidation: Comparative study of a new reactor with oxidation stability instrument

COMANDINI, PATRIZIA;VERARDO, VITO;CABONI, MARIA
2009

Abstract

Accelerated oxidation tests, such as the determination of the induction period, increase the lipid oxidation rate by exposing a food to elevated temperatures, in the presence of excess quantities of air or oxygen. In addition to the well-founded oxidative stability index (OSI) method, an innovative and promising technique is the oxidation test (OXITEST) reactor. A new analytical method was developed with OXITEST to oxidize vegetable oils. At a preliminary stage of the investigation, the induction periods of sunflower and extra-virgin olive oil obtained by the OXITEST reactor were plotted against temperature, on the basis of the Arrhenius law; the activation energy and the frequency factor of lipid oxidation were calculated and resulted, respectively, in 98.61 kJ/mol and 2.3361010 s–1 for sunflower oil and 106.48 kJ/mol and 6.2761010 s–1 for extra-virgin olive oil. The new oxidative technique was employed to determine the induction periods of vegetable oils; the results obtained were well correlated with those achieved with OSI technology, with a Pearson correlation coefficient r = 0.9785 (p ,0.05) for oilseeds and palm oil and r = 0.9501 (p ,0.05) for extra-virgin olive oils.
2009
Comandini P.;Verardo V.; Maiocchi P.; Caboni M. F.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/76891
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