Thermal degradation kinetics of xanthophylls from blood orange in model and real food systems

Hadjal Thiziri, Dhuique-Mayer Claudie, Madani Khodir, Dornier Manuel, Achir Nawel. 2013. Thermal degradation kinetics of xanthophylls from blood orange in model and real food systems. Food Chemistry, 138 (4) : 2442-2450.

https://doi.org/10.1016/j.foodchem.2012.12.022

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Quartile : Q1, Sujet : FOOD SCIENCE & TECHNOLOGY / Quartile : Q1, Sujet : CHEMISTRY, APPLIED / Quartile : Q2, Sujet : NUTRITION & DIETETICS

Résumé : Thermal degradation kinetics of the major blood orange xanthophylls (cis-violaxanthin, lutein, b-cryptoxanthin, zeaxanthin and cis-antheraxanthin) were investigated at 45, 60, 75, and 90 _C in real juice and three model systems formulated to evaluate the impact of xanthophyll form (esterified or free) and pH (acid or neutral). Xanthophylls were monitored by HPLC-DAD and kinetic parameters were identified by non-linear regression. A second order model best fitted the degradation curves of xanthophylls. All degradation rates were the lowest in real juice. Esterified forms were more stable than were the free forms. In all acidic media, b-cryptoxanthin exhibited the lowest degradation rates followed by lutein and zeaxanthin. In comparison, the epoxy carotenoids cis-violaxanthin and cis-antheraxanthin degraded around 3-fold faster in their esterified form. In their free form, cis-antheraxanthin degraded 30-fold faster while cis-violaxanthin instantaneously disappeared because of the isomerisation of its 5,6-epoxy groups into 5,8-epoxy. By contrast, in neutral medium, free epoxy-xanthophylls were about 2-fold more stable than were the free hydroxy xanthophylls lutein, zeaxanthin and b-cryptoxanthin. Kinetic behaviours of xanthophylls were closely dependent on their chemical structures.

Mots-clés Agrovoc : jus d'orange, Citrus sinensis, xanthophylle, dégradation, température, réaction chimique, estérification, pH, aptitude à la conservation

Mots-clés géographiques Agrovoc : Algérie

Mots-clés complémentaires : Cinétique

Classification Agris : Q04 - Composition des produits alimentaires
Q02 - Traitement et conservation des produits alimentaires

Champ stratégique Cirad : Axe 3 (2005-2013) - Alimentation accessible et de qualité

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