BIPLOT ANALYSIS APPLIED TO ENOLOGICAL PARAMETERS IN THE GEOGRAPHICAL CLASSIFICATION OF YOUNG RED WINES

Fifteen variables including conventional enological parameters, phenolics, and color-related parameters were analyzed in 45 young red wines belonging to the Spanish zones Ribera de Duero and Toro with Certified Brand of Origin (CBO). The data obtained were subjected to HJ biplot analysis to determine whether, with the variables employed, it would be possible to differentiate the wines according to their CBO. Alcohol, fixed acidity, pH, degree of ionization of anthocyanins, total phenolics, and procyanidins were the variables with the best relative contributions to discrimination between the two CBO's. A logistic model for estimating the probability of a given sample belonging to a certain CBO is proposed. According this prediction model, 100% of the observations for Ribera de Duero and 81.81% for those of Toro are well classified.