title: Lycopene degradation and isomerization kinetics during thermal processing of an olive oil/tomato emulsion.
abstract: The stability of lycopene in an olive oil/tomato emulsion during thermal processing (80-140 °C) was studied. Initially, the degradation of total lycopene (all-E plus Z-forms) occurred quickly at temperatures above 100 °C. However, a nonzero plateau value, depending on the processing temperature, was attained after longer treatment times. Besides degradation, the isomerization of total-Z-lycopene as well as the individual isomerization of all-E-, 5-Z-, 9-Z-, and 13-Z-lycopene was studied in detail. After prolonged heating, the isomer conversion reached a temperature-dependent equilibrium state. The degradation of total lycopene and the isomerization could be described by a fractional conversion model. The temperature dependency of the corresponding reaction rate constants was quantified by the Arrhenius equation. The activation energy of degradation was estimated to be 28 kJ/mol, and the activation energy of overall (all-E and total-Z) isomerization was estimated to be 52 kJ/mol.
authors.affiliation: Laboratory of Food Technology and Leuven Food Science and Nutrition Research Centre (LFoRCe), Department of Microbial and Molecular Systems (M2S), Katholieke Universiteit Leuven, Kasteelpark Arenberg 22, Box 2457, B-3001 Leuven, Belgium.
authors.forename: Ines J P
authors.initials: IJ
authors.lastname: Colle
authors.forename: Lien
authors.initials: L
authors.lastname: Lemmens
authors.forename: Getachew N
authors.initials: GN
authors.lastname: Tolesa
authors.forename: Sandy
authors.initials: S
authors.lastname: Van Buggenhout
authors.forename: Kristel
authors.initials: K
authors.lastname: De Vleeschouwer
authors.forename: Ann M
authors.initials: AM
authors.lastname: Van Loey
authors.forename: Marc E
authors.initials: ME
authors.lastname: Hendrickx
mesh_terms: D002338:Carotenoids / Q000737:chemistry*; D004655:Emulsions / Q000737:chemistry; D005511:Food Handling / Q000379:methods*; D006358:Hot Temperature; D007536:Isomerism; D007700:Kinetics; D000077276:Lycopene; D018551:Solanum lycopersicum / Q000737:chemistry*; D000069463:Olive Oil; D010938:Plant Oils / Q000737:chemistry*
chemical_list: D004655:Emulsions; D000069463:Olive Oil; D010938:Plant Oils; D002338:Carotenoids; D000077276:Lycopene