A fast and inexpensive approach to characterize Slovak Tokaj selection wines using infrared spectroscopy and chemometrics

The Tokaj Selection wines (hungarian equivalent Aszu) are typical noble sweet wines produced in Tokaj wine region that falls within two countries, Slovakia and Hungary. Taking into account the economic importance and uniqueness of these wines, in this work, a new, fast and inexpensive method that combines infrared spectroscopy and multivariate models for characterization Slovak Tokaj Selection wines was developed. At first, sample authentication via one class models (DD-SIMCA) considered Slovak Tokaj Selection wines as target class. The nontarget sample was considered to be only a Tokaj sample of Slovak origin. The resulting model was able to properly recognize samples of the target class with high sensitivity and specificity. Subsequently, the putna index was predicted via PLS models. RMSEP equals 0.44; REPpred of 9.6 and R-2 0.95 was found in prediction step.

Automated summary

A new method combining infrared spectroscopy and multivariate models was developed to characterize Slovak Tokaj Selection wines, successfully predicting the putna index with high accuracy.