Determination of the wine preservative sulphur dioxide with cyclic voltammetry using inkjet printed electrodes.
During winemaking sulphur dioxide is added to prevent undesirable reactions. However, concerns over the harmful effects of sulphites have led to legal limits being placed upon such additives. There is thus a need for simple and selective determinations of sulphur dioxide in wine, especially during winemaking. The simultaneous detection of polyphenols and sulphur dioxide, using cyclic voltammetry at inert electrodes is challenging due to close oxidation potentials. In the present study, inkjet printed electrodes were developed with a suitable voltammetric signal on which the polyphenol oxidation is suppressed and the oxidation peak height for sulphur dioxide corresponds linearly to the concentration. Different types of working electrodes were printed. Electrodes consisting of gold nanoparticles mixed with silver showed the highest sensitivity towards sulphur dioxide. Low cost production of the sensor elements and ultra fast determination of sulphur dioxide by cyclic voltammetry makes this technique very promising for the wine industry.
Institute of Semiconductors and Microsystems, Technische Universität Dresden, Nöthnitzer Str. 64, 01187 Dresden, Germany. Electronic address: marion.schneider@tu-dresden.de.
Marion
M
Schneider
Institute of Semiconductors and Microsystems, Technische Universität Dresden, Nöthnitzer Str. 64, 01187 Dresden, Germany.
Alexander
A
Türke
Institute of Semiconductors and Microsystems, Technische Universität Dresden, Nöthnitzer Str. 64, 01187 Dresden, Germany.
Wolf-Joachim
WJ
Fischer
Polymer Electronics Research Centre, School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland, New Zealand.
Paul A
PA
Kilmartin
D055664:Electrochemical Techniques; D004566:Electrodes; D006046:Gold; D059808:Polyphenols / Q000032:analysis; D012834:Silver; D013458:Sulfur Dioxide / Q000032:analysis*; D014920:Wine / Q000032:analysis*
D059808:Polyphenols; D013458:Sulfur Dioxide; D012834:Silver; D006046:Gold
Cyclic voltammetry; Inkjet printing; Polyphenols; Sulphur dioxide; Wine