Abstract
The Slovak Tokaj region is one of the producers of high-quality white wine having protected designations of origin. The main grape varieties of this region are Furmint, Lipovina and Muscat blanc, which have specific sensory characteristics. This research work presents a strategy for the classification of three mentioned varieties of white wines using fluorescence spectroscopy with chemometrics. Emission and synchronous fluorescence spectra were obtained for bulk as well as diluted samples, principal component analysis (PCA) was applied for exploratory analysis and the scores of the selected PCs were used in linear discriminant analysis (LDA). For undiluted samples, the best PCA-LDA models based on either emission spectra excited at 370 nm or synchronous fluorescence spectra obtained at wavelength difference of 40 and 100 nm provided total correct classifications of 100, 100 and 93% for the calibration, validation and prediction steps, respectively. For diluted samples, the best PCA-LDA models (excitation at 280 nm; wavelength difference of 40 nm) again provided total correct classifications as mentioned above.
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Acknowledgements
This research was supported by the Slovak Research and Development Agency under the contract No. APVV-15-0355. Authors would like to thank tokaj wine producers Ostrožovič spol. s.r.o. for their kind cooperation.
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Sádecká, J., Jakubíková, M. Varietal classification of white wines by fluorescence spectroscopy. J Food Sci Technol 57, 2545–2553 (2020). https://doi.org/10.1007/s13197-020-04291-y
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DOI: https://doi.org/10.1007/s13197-020-04291-y