Figure 1.

DTT consumption OP (left side) and AA consumption (right side) activities of Cu, Fe, PQN, NPQ and their binary mixtures at lower molar ratio. OP is expressed as nmol min⁻¹. The concentrations of each metal and quinone in the binary mixtures are reported in Table 1, in the first line for each mixture. The colored bars indicate OP of each single compound, while the staked bars show OP experimentally measured on their binary mixtures. Error bars denote standard deviation (1 σ) of triplicate analysis.