Chemistry Journal of Moldova: General, Industrial and Ecological Chemistry (Jul 2021)

Some Particularities of the Reaction between Antioxidant Phenolic Acids and the Free Radical ABTS•+: a Comparative DFT Study for the Gas Phase and Ethanol

  • Mikhail Gorbachev,
  • Natalia Gorinchoy,
  • Iolanta Balan

DOI
https://doi.org/10.19261/cjm.2021.919
Journal volume & issue
Vol. 17, no. 1
pp. 24 – 30

Abstract

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The detailed mechanism of the interaction of the radical cation ABTS•+ with a number of food acids (gallic, ferulic, caffeic, vanillic, cinnamic, syringic, p-coumaric) is revealed by means of the DFT calculations. It is shown that the interaction between the neutral molecules of the studied food acids and ABTS•+ does not lead to any charge transfer from these molecules onto ABTS•+. The almost complete conversion of the ABTS radical cation into its diamagnetic derivative occurs due to the interaction of one of the sulphonic groups of ABTS•+ with the acid anions through the formation of the corresponding intermolecular hydrogen bond.

Keywords