Croatica Chemica Acta, Vol. 89 No. 4, 2016.
Original scientific paper
https://doi.org/10.5562/cca3026
Structural and Antioxidative Features of Chlorogenic Acid
Jelena Tošović
orcid.org/0000-0001-5531-7193
; University of Kragujevac, Faculty of Science, Radoja Domanovića 12, 34000 Kragujevac, Serbia
Svetlana Marković
orcid.org/0000-0003-3483-3599
; University of Kragujevac, Faculty of Science, Radoja Domanovića 12, 34000 Kragujevac, Serbia
Abstract
This work contributes to the structure clarification of chlorogenic acid (5-O-caffeoylquinic acid, 5CQA) by comparing the experimental and simulated IR, Raman, 1H-NMR, 13C-NMR, and UV-vis spectra. The lowest-energy conformers in the gas-phase and solution were used for all calculations. Very good agreement between all experimental and simulated spectra indicates correct arrangement of the atoms in the 5CQA molecule. In addition, the bond dissociation enthalpies, proton affinities, electron transfer enthalpies, ionization potentials, and proton dissociation enthalpies for 5CQA were used for thermodynamic consideration of the major antioxidative mechanisms: HAT (Hydrogen Atom Transfer), SPLET (Sequential Proton-Loss Electron-Transfer), and SET-PT (Single Electron Transfer – Proton Transfer). It was found that HAT may be the predominant mechanism in nonpolar solvents, while HAT and SPLET are competitive pathways in polar media.
All quantum-chemical calculations were carried out by means of the MN12-SX method. Its performance is similar to those of the B3LYP-D2, B3LYP-D3, and M06-2X functionals.
This work is licensed under a Creative Commons Attribution 4.0 International License.
Keywords
chlorogenic acid; spectral properties; thermodynamic parameters; MN12-SX
Hrčak ID:
179369
URI
Publication date:
19.12.2016.
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