An improvement of the the Trolox® equivalent antioxidant capacity (TEAC) assay, using the ABTS^+. radical-cation discoloration method, produced a highly efficient method for the exploration of the natural and/or synthetic product antioxidant capacity (AOC). The improved method was developed in a Versamax 96-well microplate reader with data acquisition software, SoftMax® Pro-software. The proposed method incorporated three modifications: areaction-time increase to near completion; an assay miniaturization using 96-well multiplate reader, and TEAC value determination of the relationship between the 50 % inhibitory concentrations (IC₅₀) of the tested substances and Trolox®, under equilibrium. The modifications led to a substantial decrease of: