Comparison of Electrochemical Oxidation of Flavonols and Calculated Proton Affinity and Electron Transfer Enthalpy in Water |
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| Authors: | Sina Kummer Wolfgang Ruth Oliver Kühn Udo Kragl |
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| Institution: | 1. University of Rostock, Institute of Chemistry, D‐18051 Rostock, Germany;2. University of Rostock, Institute of Physics, D‐18051 Rostock, Germany |
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| Abstract: | Flavonols, a class of flavonoids, are present in flowers, fruits and vegetables. They are jointly responsible for antioxidant activity as free radical acceptors. The redox behaviour of myricetin, quercetin, isorhamnetin, fisetin, morin and kaempferol is investigated using cyclic and differential pulse voltammetry. Quantum chemical calculations of proton affinities and electron transfer enthalpies were performed to identify possible reactive sites and radical species to compare them with measured oxidation potentials of the flavonols. Regarding to their chemical structure, these flavonols showed an oxidation order: myricetin > quercetin > isorhamnetin > fisetin > morin > kaempferol. |
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| Keywords: | Density functional calculations Deprotonation Flavonoids SPLET Voltammetry |
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