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Fluorescence spectroscopy for characterization and differentiation of beers

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Fig. 1. Contour maps of the fluorescence of a lager beer (Beer  G): (A) Front-face geometry, bulk beer; (B) Right-angled  ge-ometry, diluted beer, 3.2% in water (v/v); (C) Back-face  geome-try, bulk beer
Fig. 2 shows the fluorescence intensity at three excita- excita-tion /emission wavelength pairs: 260 /350 nm, 360 /430  nm, and 450 /540 nm, as a function of the beer  concentra-tion, obtained in the right-angled arrangement
Table I. Classification of beers using entire synchronous fluorescence  spectra in the k nearest neighbours method (diluted beers)
Fig. 7. Classification of beers by linear discriminant analy- sis. Top panels: bulk beers at  = 10 nm and at  = 60 nm;bottom panels: diluted beers at = 10 nm and at  =60 nm

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