Prediction of theaflavin and thearubigin content in black tea using a voltammetric electronic tongue
The two most important chemical groups that decide the liquor characteristics of black CTC (cut, torn and curled) tea are theaflavins (TF) and thearubigins (TR). Hence, a quick estimation of concentration of these compounds can significantly contribute to the evaluation process for the quality of finished tea in an objective manner. In this paper, a scheme for rapid measurement of concentration of TF and TR is described using a voltammetric electronic tongue with five working electrodes made of noble metals. The results indicate good correlation of electronic tongue predictions with the actual concentrations obtained using ultraviolet-visible spectrophotometer. (C) 2012 Elsevier B.V. All rights reserved.
theaflavins thearubigins voltammetric electronic tongue partial least squares regression support vector regression multi-layer perceptrons