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Dynamic and isothermal DSC investigation of the kinetics of thermooxidative decomposition of some edible oils

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Abstract

The kinetics of thermooxidation of edible oils: soybean oil, rapeseed oil, corn and peanut oil was investigated in two ways. The DSC and its pressure version (PDSC) were used for measurements under the isothermal and non-isothermal conditions in atmosphere of oxygen. Comparing these two methods for each oil the differences between the values of activation energies were observed. However, mechanism of oxidation in both method was different.

Zusammenfassung

Auf zwei verschiedene Arten wurde, die Kinetik der Thermooxidation von Speiseölen (Sojabohnenöl, Rapsöl, Weizenöl und Erdmußöl) untersucht. Zur Messung unter isothermen und nichtisothermen Bedingungen in einer Sauerstoffatmosphäre wurden DSC und deren Druckvariante (PDSC) eingesetzt. Im Vergleich dieser beiden Methoden wurden für jede Ölsorte die Unterschiede bei den Werten für die Aktivierungsenergien beobachtet. Der Oxidationsmechanismus ist in beiden Methoden unterschiedlich.

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Litwinienko, G., Kasprzycka-Guttman, T. & Jarosz-Jarszewska, M. Dynamic and isothermal DSC investigation of the kinetics of thermooxidative decomposition of some edible oils. Journal of Thermal Analysis 45, 741–750 (1995). https://doi.org/10.1007/BF02548890

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