A single cataluminescence sensor for wine identification by luminescent response profiles

Abstract

In this paper, a new method involving cataluminescence (CTL) response profiles combined with chemometrics was developed in an attempt to classify wine of different types (health liquor, brandy, glutinous wine, beer and grape wine). In a closed reaction cell (CRC), with an optimal injection volume of 10 μl, reaction temperature of 350 °C and detection wavelength of 425 nm, the unique response profiles of wine were obtained on the surface of nano-ZrO₂. The comparison of the characteristic profiles with marked extreme points, as the first step of classification, showed that the extreme points of wine of different types were substantially different. The application of linear discriminant analysis (LDA), as the second step of classification, showed that all of the samples were well-discriminated with an accuracy of 100%. The method is effective and fast and does not require sample preparation. The stable and reversible response of this proposed sensor, combined with its simple instrumentation, indicates its promise in real-world wine identification.