Abstract
The biological antioxidant activity of vitamin E has been related to the stability of the tocopheroxyl radical. Using anion photoelectron imaging and electronic structure calculations, the four tocopheroxyl components of vitamin E have been studied in the gas phase and have yielded the adiabatic electron affinity of the α-, β/γ-, and δ-tocopheroxyl radicals. Using these values, the bond dissociation enthalpy of the O-H bond of tocopherol has been estimated and is consistent with previous studies and with the trends in biological activity. Differences in the photoelectron angular distributions have been interpreted to result from changes in the symmetry of the molecular orbitals from which the electron was detached.
| Original language | English |
|---|---|
| Pages (from-to) | 7108-7113 |
| Number of pages | 6 |
| Journal | Journal of Physical Chemistry B (Soft Condensed Matter and Biophysical Chemistry) |
| Volume | 120 |
| Issue number | 29 |
| Early online date | 14 Jul 2016 |
| DOIs | |
| Publication status | Published - 28 Jul 2016 |
| Externally published | Yes |
Keywords
- Free Radicals/chemistry
- Photoelectron Spectroscopy
- Quantum Theory
- Thermodynamics
- Vitamin E/chemistry