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Cyclic voltammograms (background subtracted) for the couples: proanthocyanidin TN12/(+) – catechin; (a) ellagitannin TN6/ellagic acid; (b) gallotannin TN14/gallic acid; (c) in the model wine solution, measured at 100 mV/s above the potential range: −200 mV to 1000 mV, at a 3 mm glassy carbon electrode.
