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Antioxidant activities of compounds 1 and 2. (a) FTC assay (i) absorbance at 500 nm, (ii) ratios of antioxidant values normalized to α-tocopherol. (b) TBA assay (i) absorbance at 532 nm, (ii) ratios of antioxidant values normalized to α-tocopherol. (c) DPPH assay. The sample test concentrations in (a) to (c) are 0.6 mM, 0.2 mM, and 0.3 mM, respectively. Assays were carried out in triplicate and averaged (±0.1 absorbance units).
