Potentiometric sensors based on polyaniline and thiacalixarenes for green tea discrimination

Abstract

The performance of potentiometric sensors based on carbon screen-printed and glassy carbon electrodes covered with polyaniline (PANI) and thiacalix[4]arene receptors have been compared in the determination of some ions and discrimination of green tea brands. The optimization of PANI electropolymerization provided satisfactory characteristics of screen-printed electrodes comparable with those of conventional sensors based on glassy carbon. The potentiometric sensors make it possible to determine 1×10-2-1×10-6 M Fe3+ ions. Also, successful discrimination of twelve tea brands was performed with three-sensor array. The 100% true prediction was confirmed by principal component analysis (PCA) and linear discriminant analysis (LDA). © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.