was no correlation between antioxidant capacity and the contents of five of the individual vitamin E isomers, however a significant correlation was observed between antioxidant capacity and a-T3 content (n = 25, r = 0.7, p < 0.05). For example, Harrington had high antioxidant capacity and a-T3 content while ICARDA 39 had low antioxidant capacity and a-T3 content. Although a-T has historically been reported as the most efficient antioxidant (Mclaughlin & Weihrauch, 1979), a-T3 has recently been shown to be at least threefold more efficient as a scavenger of peroxyl radicals than a-T (Packer, 1995). a-T3 was the main vitamin E isomer in barley grain,regardless of genotype, and the correlation with antioxidant capacity supports this observation.