Chemistry Reference
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dissociation energies of 79.1, 80.2, 80.1, and 82.2 kcal/mol, respectively which
show that -tocopherol has the most easily abstracted hydrogen on its hydroxyl
group.
Plant phenolics
Besides tocopherols, plants contain a diverse group of phenolic compounds
including simple phenolics, phenolic acids, anthocyanins, hydroxycinnamic acid
derivatives and flavonoids originating from foods such as fruits, spices, tea,
coffee, seeds and grains (see Fig. 10.3 for several examples). Many plant
phenolics have numerous hydroxyl groups suggesting that they could scavenge
multiple free radicals. However, in phenolics such as flavonoids, only the OH
group at 1 and 3 position in the B-ring are active, while the OH group at 2 position
in the A-ring of flavonoids does not scavenge free radicals (Thavasi, 2009).
Fig. 10.3 Structures of several important phenolic free radical scavengers found
naturally in plants.
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