Antioxidants can deactivate radicals by two major mechanisms,
Hydrogen Atom Transfer (HAT) and Single Electron
Transfer (SET), depending on the kinetics and
potential for side reactions (Huang, Ou, & Prior, 2005;
Prior, Wu, & Schaich, 2005). HAT-based methods measure
the ability of an antioxidant to quench free radicals by
hydrogen donation. Reactivity in HAT methods is determined
by the BDE (bond dissociation energy) of the Hdonating
group in the potential antioxidant. Oxygen
Radical Absorbance Capacity (ORAC), and Total
Radical-trapping Antioxidant Parameter (TRAP) are the