研究目的
To investigate the application of UV-Vis, synchronous fluorescence, and NIR spectroscopies to the classification of tea types, as well as the complementarity of the applied spectroscopies, and to compare the performance of four classification methods: LDA, QDA, RDA, and SVM.
研究成果
The study demonstrated that UV-Vis, synchronous fluorescence, and NIR spectroscopies can effectively classify tea types, with data fusion models providing the lowest classification errors. The SVM method outperformed other classification methods for data fusion matrices.
研究不足
The study focused on a limited number of tea samples (36) from specific countries. The classification methods' performance might vary with a larger and more diverse dataset.
1:Experimental Design and Method Selection
The study employed UV-Vis, synchronous fluorescence, and NIR spectroscopies for the classification of tea samples. PCA was used for data dimensionality reduction, followed by classification using LDA, QDA, RDA, and SVM methods.
2:Sample Selection and Data Sources
36 tea samples (6 of each type: dark, black, green, white, oolong, yellow) from different countries were purchased in shops in Poland. Samples were ground and sieved before preparation.
3:List of Experimental Equipment and Materials
Genesis 6 spectrophotometer UV-Vis for UV-Vis spectra, Spectrofluorometer Thermo Scientific Lumina for synchronous fluorescence spectra, MPA/FT-NIR spectrometer for NIR spectra.
4:Experimental Procedures and Operational Workflow
Tea infusions were prepared, cooled, filtered, and diluted for UV-Vis and fluorescence spectroscopies. NIR spectra were measured without dilution. All spectra were measured in triplicate.
5:Data Analysis Methods
PCA was applied for data dimensionality reduction. Classification methods (LDA, QDA, RDA, SVM) were used to analyze spectroscopic data. Classification error rates were calculated to evaluate performance.
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