Caracterización de vinos nacionales para la determinación del origen geográfico empleando quimiometría

Abstract

This research aimed to characterize the geographical origin of eight national and eight Chilean wine brands and compare them using chemometrics based on eight determined physicochemical parameters. The following analyses were carried out: measurement of alcohol content using the distillation method to determine the degree of ethanol contained using a hydrometer; pH measurement using a pH meter; obtaining total acidity by the volumetric method, performing an acid-base titration with 0.1 N sodium hydroxide standard; obtaining fixed acidity based on the reduction of fixed acids by applying the volumetric method by performing an acid-base titration with 0.1 N sodium hydroxide standard, obtaining the volatile acidity by the difference between the total acidity and the fixed acidity, measuring the density of wines by pycnometer, determination of total sugars applying the spectrophotometry technique, determination of dissolved sugars using the digital refractometer to measure Brix degrees. The analyses proposed in this research were carried out in duplicate to construct a matrix of these data, which, through chemometrics, two studies of interest were carried out: Data Grouping and Principal Components.