Exploration of reaction mechanisms of anthocyanin degradation in a roselle extract through kinetic studies on formulated model media
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.
| Main Authors: | , , , , , , |
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| Format: | article biblioteca |
| Language: | eng |
| Subjects: | Q02 - Traitement et conservation des produits alimentaires, Q04 - Composition des produits alimentaires, Hibiscus sabdariffa, polyphénol, delphinidine, anthocyane, cyanidine, cinétique chimique, dégazage, roselle, fer, tannin, dégradation, http://aims.fao.org/aos/agrovoc/c_3604, http://aims.fao.org/aos/agrovoc/c_15881, http://aims.fao.org/aos/agrovoc/c_36689, http://aims.fao.org/aos/agrovoc/c_8840, http://aims.fao.org/aos/agrovoc/c_10230, http://aims.fao.org/aos/agrovoc/c_db2ad5ed, http://aims.fao.org/aos/agrovoc/c_2158, http://aims.fao.org/aos/agrovoc/c_a8b0f9a7, http://aims.fao.org/aos/agrovoc/c_3950, http://aims.fao.org/aos/agrovoc/c_7606, http://aims.fao.org/aos/agrovoc/c_2159, |
| Online Access: | http://agritrop.cirad.fr/584735/ http://agritrop.cirad.fr/584735/1/1-s2.0-S0308814617308075-main.pdf |
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