Chronoamperometry as a tool for the evaluation of antioxidant properties of red wines

Cyclic voltammetry and chronoamperometry at two different potentials of +500 and +800 mV was applied to nine commercial dry red wines of five different vintages in order to study their capability in oxidation. A plateau in a certain potential range of +0.82 ± 0.04 V obtained for all investigated wine samples revealed the presence of oxidation mechanisms with successive oxidation steps. Chronoamperometric data at +800 mV were found to be consistent with data coming from the antioxidant protocol against 1,1-diphenyl-2-dipicrylhydrazyl ( DPPH ). Indeed, the results showed a positive correlation of chronoamperometric signal of wine samples at +800 mV with their reactivity towards DPPH, expressed as Trolox equivalents, followed by satisfactory statistics. Therefore, the chronoamperometric signal of wine samples can be considered as a friendly alternative for the rapid screening of antioxidant properties of wine samples.