title: Kinetic modelling of the degradation of the alpha-tocopherol in biodiesel-rape methyl ester.
abstract: The aim of this work was to study the influence of three major factors (light, atmospheric oxygen, temperature) responsible for the degradation of tocopherols. The evolution of alpha-tocopherol contents was analysed by high-performance liquid chromatography. Taguchi's experimental design was applied to establish a mathematical model of alpha-tocopherols degradation in function of the studied parameters especially in a domain of temperature between 50 degrees C and 150 degrees C. The results show that the major factor is the temperature, especially above 100 degrees C. Light is a negligible factor, meaning that degradation is mainly due to an autoxidation phenomenon. Moreover, only interactions between temperature and atmospheric oxygen have been observed especially above 100 degrees C. The mathematical model was validated for a temperature of 75 degrees C and permits to calculate a predictive speed of degradation in this domain.
authors.affiliation: Laboratoire de Génie des Procédés pour l'Environnement, l'Energie et la Santé (EA 21), Institut Universitaire de Technologie, Université d'Orléans, Rue d'Issoudun, BP 16729, 45067 Orléans Cedex 2, France. stephane.bostyn@univ-orleans.fr
authors.forename: Stéphane
authors.initials: S
authors.lastname: Bostyn
authors.forename: Fanny
authors.initials: F
authors.lastname: Duval-Onen
authors.forename: Catherine
authors.initials: C
authors.lastname: Porte
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Coïc
authors.forename: Henri
authors.initials: H
authors.lastname: Fauduet
mesh_terms: D029741:Brassica rapa / Q000737:chemistry*; D004952:Esters; D007700:Kinetics; D008962:Models, Theoretical; D024502:alpha-Tocopherol / Q000737:chemistry*
chemical_list: D004952:Esters; D024502:alpha-Tocopherol