Abstract
Kaempferol, one of the most bioactive plant flavonoids was experimentally and theoretically (at M05-2X/6-311G(d,p) level of theory) investigated for its ability to scavenge potentially, highly damaging hydroxyl and superoxide anion radicals. Relating the obtained hydroxyl radical activity sequence with kaempferol structural features, it could be assumed that C4′-OH functional most probably renders it as hydroxyl radical scavenger, while C5-OH group has more prominent role compared to ortho-hydroxy groups in B ring. However, kaempferol’s activity toward superoxide anion radical implicates ortho-hydroxy groups in B ring as more relevant. Theoretical calculations point to HAT and SPLET mechanisms as operative for kaempferol in all solvents under investigations.
Graphical Abstract
The present paper aims to provide quantitative tools to thoroughly and comprehensively determine antiradical mechanisms of kaempferol in different media.
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The authors acknowledge financial support of the Ministry of Science of the Republic of Serbia, Grants No. 172015 and 41005.
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Dimitrić Marković, J.M., Milenković, D., Amić, D. et al. Energy requirements of the reactions of kaempferol and selected radical species in different media: towards the prediction of the possible radical scavenging mechanisms. Struct Chem 25, 1795–1804 (2014). https://doi.org/10.1007/s11224-014-0453-z
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DOI: https://doi.org/10.1007/s11224-014-0453-z