Vedecký časopis

54 2015

Journal of Food and Nutrition Research
Súhrny čísla 4 / 2015

Uríčková, V. – Sádecká, J. – Májek, P.
Classification of Slovak juniper-flavoured spirit drinks
Journal of Food and Nutrition Research, 54, 2015, č. 4, s. 298-307

Veronika Uríčková, Institute of Analytical Chemistry, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, SK-812 37 Bratislava, Slovakia. E-mail: veronika.urickova@stuba.sk

Received 25 February 2015; revised 6 June 2015; accepted 11 June 2015; published online 17 September 2015.

Súhrn: Synchronous fluorescence (SF) spectra measured at constant wavelength differences from 10 nm to 100 nm in the excitation wavelength range 250–350 nm and pattern-recognition methods were used for searching the natural grouping among Slovak juniper-flavoured spirit drinks. The best result was achieved using SF spectra recorded at a constant wavelength difference of 10 nm. Supervised methods were used to classify samples considering two types of classification criteria: distinguishing between drinks from different producers or distillates of different geographical indications and others. The supervised methods were based on two different data sets: the first principal components of the principal component analysis performed on the SF spectra and the SF spectra. Linear discriminant analysis was applied to the first principal components. General discriminant analysis (GDA), k-nearest neighbour (kNN) and support vector machine (SVM) were applied to SF spectra. Regarding different producers, both use of both GDA and SVM resulted in 100% correct classification. Regarding geographical indiciation, 100% correct classification was obtained using GDA.

Kľúčové slová: beverages; synchronous fluorescence; multivariate analysis

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