Inkjet printed electrodes for determination of sulfur dioxide and ascorbic acid in wine

The determination of wine additives such as sulfur dioxide and ascorbic acid is motivated by limiting these substances because of their potential noxious effects. Cyclic voltammetry with inkjet printed electrodes on a PET foil was used to quantify free sulfur dioxide and ascorbic acid in a model wine solution. Two different kinds of electrodes were manufactured: Silver electrodes and silver electrodes modified with gold nanoparticles. Inkjet printed electrodes showed high sensitivity and selectivity towards ascorbic acid and sulfur dioxide and a linear relationship between concentration and peak current was observed. Modification of the inkjet printed silver electrode with gold nanoparticles increased the sensitivity. Additionally, more defined current peaks were obtained, that proved the excellent suitability of the silver electrodes modified with gold nanoparticles for precise determination of sulfur dioxide and ascorbic acid in wine.