Classification of white varietal wines using chemical analysis and sensorial evaluations

The ways of application of multivariate data analysis and ANOVA to classification of white varietal wines are here demonstrated. Wine classification was performed using the following classification criteria: winevariety, year of production, wine producer, and wine quality, as found by sensorial testing (bouquet, colour, and taste). Subjective wine evaluation, made by wine experts, is combined with commonly used chemical and physico-chemical properties, measured in analytical laboratory. Importance of the measured variables was determined by principal component analysis and confirmed by analysis of variance. Linear discriminant analysis enabled not only a very successful wine classification but also prediction of the wine category for unknown samples. The wine categories were set up either by three wine varieties, or two vintages, wine producerstwo or three wine categories established by wine quality reflected either total points obtained in sensorial evaluation or the points obtained for a particular quality descriptor like colour, taste and bouquet.Prikazali smo načine uporabe analize večdimenzionalnih podatkov in ANOVE pri klasifikaciji vin belih vrst. Klasifikacijo smo izvedli z uporabo več klasifikacijskih kriterijev, ki so vrsta vina, letnik, proizvajalec in kakovost vina kot je bila ocenjena s senzoričnim preskušanjem (cvetica, barva in okus). Uporabili smo kombinacijo subjektivnih ocen vzorcev vin s strani enologov in fizikalno kemijskih lastnosti vzorcev vin izmerjenih v analiznem laboratoriju. Vplivnost izmerjenih spremenljivk smo določili z metodo glavnih osi in rezultate potrdili z analizo variance. Z linearno diskriminantno analizo smo vzorce vin uspešno ustrezno uvrstili v razrede, kakor tudi neznane vzorce vin uvrstili v ustrezno kategorijo. Kategorije vina smo določili glede na tri vrste vina, na dva letnika in na dva proizvajalca. Dve ali tri kategorije smo določili glede na kakovost vina, ki je bila odraz skupne ocene senzorične analize vzorcev vin ali ocene vzorcev vin po posameznih deskriptorjih opravljene senzorične analize (barva, okus in cvetica)