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  Chemical Sensors 2011, 1: 6
  Research Article
Solid-contact potentiometric sensors for discrimination of hot spirits
  G.A. Evtugyn*, N.N. Dolgova, S.V. Belyakova, E.E. Stoikova, A.N. Ivanov, I.I. Stoikov, H.C. Budnikov, I.S. Antipin  
A.M.Butlerov' Chemistry Institute, Kazan Federal University, 18 Kremlevskaya Street, Kazan, 420008, Russian Federation
  The potentiometric sensors based on glassy carbon electrodes covered with polyaniline and thiacalix[4]arene receptors have been examined in the discrimination of the brands of some hot spirits (vodka, cognac, whiskey). For this purpose, the samples tested were diluted and spiked with a constant amount of Fe3+ ions. The variation of the signal toward Fe3+ ions was achieved due to their reactions with the organic ligands and the antioxidants altered by ethanol. The effect of some model additives like quercetin, ascorbic, succinic and citric acid on the sensor signal was considered both for model aqueous solutions and spiked hot drinks. Based on the results obtained, optimal combination of the number of dilutions and Fe3+ concentrations have been established to reach 100% efficient discrimination of hot spirits. The measurement protocol makes it possible to discriminate 14 hot spirits within 30-40 min. using 18 or 36 measurements of individual signals of the sensors containing two different thiacalix[4]arene receptors. The 100% true prediction was confirmed by linear discriminant analysis.
  Solid-contact potentiometric sensor; Polyaniline; Thiacalixarene; Hot spirits discrimination; PCA  

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