Fluorescence spectroscopy for characterization and differentiation of beers

• Autor(a) principal: Sikorska, E.
• Data de Publicação: 2004
• Outros Autores: Gorecki, Tomasz, Khmelinskii, Igor, Sikorski, M., De Keukeleire, D.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10400.1/12133
• topic: Beer; Discriminant analysis; Synchronous fluorescence spectroscopy; Total luminescence spectroscopy

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.