Rezumat
CZU 54.08:544.653:663.21
The paper deals with the electrochemical behaviour of the initial materials for sparkling wine-making on the base of liqueurs and cryoconcentrates using electrochemical impedance spectroscopy. The use of a measuring system with platinum electrodes and models that take account of the heterogeneity of the electrode surface in electrochemical reactions made it possible to determine certain peculiarities of the electrochemical systems under study. For liqueur samples, a unified design model is proposed that takes into consideration the heterogeneity of the electrode surface in the electrode redox reactions, while for samples of natural cryoconcentrates – a model with the inductive resistance. Usage of the proposed models allowed the authors to find a quantitative correlation between the resistance of the electrode and the concentration of sugar in liqueur samples. In samples of cryoconcentrates, a symbatic relationship has been revealed between the concentration of sugars and titratable acids and the impedance element of the constant phase and inductance, thus suggesting the presence of the reversible deprotonation of the wine sugar.
Keywords: sparkling wine, liqueur, cryoconcentrate, impedance spectroscopy, control.