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Hydrogen peroxide formation in the presence of various concentrations of CuSO4 (0–500 μm) and sodium ascorbate (0–5 mm), monitored by fluorescence of amplex red (λex=570 nm, λem=590 nm) in the presence of horseradish peroxidase at 10 and 60 min after addition of ascorbate: A,B) In the absence of ligand 3; C,D) in the presence of 5 equivalents of ligand 3 with respect to Cu.
