Arcavacata, sabato 28 novembre 2020

Antioxidants


Phenolic compounds (ArOH) can exhert the free radical scavengin activity by following essentially three important mechanisms: i) the hydrogen atom transfer (HAT) in which the radical abstract the hydrogen from the antioxidant molecule in one single step; ii) the single-electron transfer followed by proton transfer (SET-PT), which takes place in two steps: first the radical cation is formed via electron transfer from the antioxidant to the free radical, and then it deprotonates yielding the  radical, followed by ROH formationiii) the sequential proton loss electron transfer (SPLET) takes place through two consecutive steps that are deprotonation of the phenolic compound and the consecutive electron transfer from the phenoxide anion to RO• to form the phenoxyl radical. The geometrical and electronic features of polyphenolic systems determine their antioxidant activity and be accurately described by means of quantum mechanics-based studies

Selected publications:

On the Inhibition of Hydroxyl Radical Formation by Hydroxycinnamic Acids: The Case of Caffeic Acid as a Promising Chelating Ligand of a Ferrous Ion. Journal of Physical Chemistry A, 2019, 123, 9560-9566

Coumarin-Chalcone Hybrids as Peroxyl Radical Scavengers: Kinetics and Mechanisms. Journal of Chemical Information and Modeling, 2016, 56, 662−670

Food Antioxidants: Chemical Insights at Molecular Level. Annu. Rev. Food Sci. Technol. 2016, 7, 335-352

Ab initio calculations on the 1O2 quenching mechanism by trans-resveratrol. Phys. Chem. Chem. Phys., 2014, 16, 12773-12781

 






letto 95
ultimo aggiornamento: domenica 29 novembre 2020 - 11:40