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Influence of different free radicals on scavenging potency of gallic acid


The M05-2X/6-311++G(d,p) and B3LYP-D2/6-311++G(d,p) models are used to evaluate scavenging potency of gallic acid. The hydrogen atom transfer (HAT), sequential proton loss electron transfer (SPLET), and single electron transfer followed by proton transfer (SET-PT) mechanisms of gallic acid with some radicals (OO, OH, and CH3OO) were investigated using the corresponding thermodynamic quantities: bond dissociation enthalpy (BDE), ionization potential (IP), and proton affinity (PA). Namely, the ΔHBDE, ΔHIP, and ΔHPA values of the corresponding reactions in some solvents (water, DMSO, pentylethanoate, and benzene) are investigated using an implicit solvation model (SMD). An approach based on the reactions enthalpies related to the examined mechanisms is applied. This approach shows that a thermodynamically favored mechanism depends on the polarity of reaction media and properties of free radical reactive species. The most acidic 4-OH group of gallic acid is the active site for radical inactivation. The results of this investigation indicate that the SPLET mechanism can be a favored reaction pathway for all three radicals in all solvents, except for OH in the aqueous solution. In water, gallic acid can inactivate OH by the HAT mechanism.

Influence of different solvents on antioxidative mechanisms of gallic acid

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The authors gratefully acknowledge financial support from the Ministry of Science of the Republic of Serbia (Projects No. 172015 and 174028), and the Ministry of Science, Education and Sports of the Republic of Croatia (Projects Nos.: 079-0000000-3211 and 098-0982464-2511).

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Correspondence to Jelena Đorović.

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Đorović, J., Marković, J.M.D., Stepanić, V. et al. Influence of different free radicals on scavenging potency of gallic acid. J Mol Model 20, 2345 (2014).

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  • Bond dissociation enthalpy
  • DFT
  • Gallic acid
  • Proton affinity