Exploration of reaction mechanisms of anthocyanin degradation in a roselle extract through kinetic studies on formulated model media

Sinela André Mundombe, Mertz Christian, Achir Nawel, Rawat Nadirah, Vidot Kévin, Fulcrand Hélène, Dornier Manuel. 2017. Exploration of reaction mechanisms of anthocyanin degradation in a roselle extract through kinetic studies on formulated model media. Food Chemistry, 235 : 67-75.

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

Résumé : Effect of oxygen, polyphenols and metals was studied on degradation of delphinidin and cyanidin 3-O-sambubioside of Hibiscus sabdariffa L. Experiments were conducted on aqueous extracts degassed or not, an isolated polyphenolic fraction and extract-like model media, allowing the impact of the different constituents to be decoupled. All solutions were stored for 2 months at 37 °C. Anthocyanin and their degradation compounds were regularly HPLC-DAD-analyzed. Oxygen concentration did not impact the anthocyanin degradation rate. Degradation rate of delphinidin 3-O-sambubioside increased 6-fold when mixed with iron from 1 to 13 mg.kg−1 but decreased with chlorogenic and gallic acids. Degradation rate of cyanidin 3-O-sambubioside was not affected by polyphenols but increased by 3-fold with increasing iron concentration with a concomitant yield decrease of scission product, protocatechuic acid. Two pathways of degradation of anthocyanins were identified: a major metal-catalyzed oxidation followed by condensation and a minor scission which represents about 10% of degraded anthocyanins.

Mots-clés Agrovoc : Hibiscus sabdariffa, polyphénol, delphinidine, anthocyane, cyanidine, cinétique chimique, dégazage, roselle, fer, tannin, dégradation

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

Champ stratégique Cirad : Axe 3 (2014-2018) - Alimentation durable

Auteurs et affiliations

• Sinela André Mundombe, Instituto Superior de Tecnologia Agro-Alimentar de Malanje (AGO)
• Mertz Christian, CIRAD-PERSYST-UMR Qualisud (FRA)
• Achir Nawel, Montpellier SupAgro (FRA)
• Rawat Nadirah
• Vidot Kévin
• Fulcrand Hélène, INRA (FRA)
• Dornier Manuel, Montpellier SupAgro (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/584735/)

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