Browsing by Author "Gorecki, Tomasz"
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- Discrimination of beer flavours by analysis of volatiles using the mass spectrometer as an electronic nosePublication . Sikorska, Ewa; Chmielewski, Jaroslaw; Gorecki, Tomasz; Khmelinskii, Igor; Sikorski, Marek; De Keukeleire, DenisEntire mass spectra of beer headspace components were used as fingerprints for beer brand classification and differentiation of beer samples stored under various conditions. Chemometric analysis of the mass spectra allowed for the discrimination of beer brands and for the detection of beer aging and photodegradation. The numeric methods used include unsupervised PCA modelling and discrimination using kappa NN, LDA, and D-PLS methods.
- Fluorescence spectroscopy for characterization and differentiation of beersPublication . Sikorska, E.; Gorecki, Tomasz; Khmelinskii, Igor; Sikorski, M.; De Keukeleire, D.Total luminescence and synchronous scanning fluorescence spectroscopic techniques were applied for characterization of the intrinsic fluorescence of eight different beers. Spectra were measured using different geometries to reveal the presence of similar fluorescent components. The total luminescence and synchronous fluorescence spectra exhibit a relatively intense short-wavelength emission ascribed to aromatic amino acids and less intense emission in the long-wavelength region, which may originate from B vitamins. Classification of beers based on their synchronous fluorescence spectra was performed using non-parametrical k nearest neighbours method and linear discriminant analysis. Very good discrimination was obtained in both methods with a low classification error. The results demonstrate the potential of fluorescence techniques to characterize and differentiate beers.