A quantum chemical study on the OH radical quenching by natural antioxidant fisetin. (2nd March 2017)

• Record Type: Journal Article
• Authors: Bayat, Ahmad; Fattahi, Alireza
• Is Part Of: Journal of physical organic chemistry. Volume 30:Number 11(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-03-02
• Subjects: antioxidant quenching -- DFT study -- fisetin antioxidant -- OH radical; Chemistry, Physical organic -- Periodicals; 547.1
• DOI: 10.1002/poc.3692
• Languages: English
• ISSNs: 0894-3230

Abstract

Abstract: In this work, the antioxidant ability of fisetin was explored toward hydroxyl (OH) radical in aqueous and lipid solution using density functional level of theory. Different reaction mechanisms have been studied: hydrogen atom transfer, single electron transfer followed by proton transfer, and radical adduct formation, and sequential proton loss electron transfer. Rate constants for all possible reaction sites have been calculated using conventional transition state theory in conjunction with the Collins‐Kimball theory. Branching ratios for the different channels of reaction are reported for the first time. Results show that the reactivity of fisetin toward hydroxyl ( OH) radical takes place almost exclusively by radical adduct formation regardless of the polarity of the environment. Also, the single‐electron transfer process seems to be thermodynamically unfavorable in both media. Abstract : In this work, the antioxidant ability of fisetin was explored toward hydroxyl (OH) radical in aqueous and lipid solution using density functional level of theory. Results show that the reactivity of fisetin toward hydroxyl ( OH) radical takes place almost exclusively by radical adduct formation regardless of the polarity of the environment. Also, the single‐electron transfer process seems to be thermodynamically unfavorable in both media.