Four tocopherols and four tocotrienols were tested for their
antioxidant activity using FRAP assay, aTEAC assay, DPPH
radical-scavenging assay, ORAC assay and CL assay. a-T is
considered to have the highest biological activity and
therefore it was used as standard for all comparisons. In all
performed assays, we demonstrated that the phenol group is
an important key for the antioxidant activity of tocochromanols.
a-TA, a popular ingredient in vitamin E supplements,
did not show any significant antioxidant activity
in vitro