CaracterizaÃÃo e distinÃÃo analÃtica e quimiomÃtrica de vinhos elaborados no Vale do SÃo Francisco e no Rio Grande do Sul / Characterization, analysis and chemometrical distinction of wines grown in the SÃo Francisco Valley and in the state of Rio Grande do Sul

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

Quality wines are grown in specific wine regions and may be characterized both by their chemical composition and appeal to the senses. The Lower SÃo Francisco Valley (Vale do SubmÃdio SÃo Francisco – VSMSF) is a recent and growing production region, requiring research into the characteristics of the wines grown there in order to describe and gain a geographic identity for them. Standard analytical methods were used to determine the contents as to the pH, total titulable acidity (Att), density (den), dry extract (Ext), alcohol content (EtOH), and concentrations of sodium (Na+), potassium (K+), phosphorus (PO4 3-) e ammonium (NH4 +) in order to characterize the experimental white and red wines of the VSMSF and the commercial red wines from Rio Grande do Sul (RS) and VSMSF. Chemometrical analysis techniques for Principal Components (PCA) and Hierarchical Cluster (HCA) Analysis were used to discriminate among the wines and methods of Partial Least Squares (PLS) and Principal Component Regression were used in a preliminary test to establish some of these parameters using spectra in the near infra-red region. It was observed that the commercial red wines from the VSMSF had higher density, dry extract, sodium, potassium, ammonium and phosphorus, being thus different from the commercial wines coming from RS and the experimental VSMSF wines analyzed in this work. The wines from the VSF also had high levels of pH and less alcohol content, which could be a cause for their rapid degradation. Both the chemometric analyses PCA and HCA and their Near and Medium infrared spectra (NIR, MID) made it possible to distinguish the commercial Valley wines from the others with respect to the parameters studied. Regressions for PCR and PLS, in the preliminary study, indicated the potential for using NIR spectra to predict some of the parameters established in this work

ASSUNTO(S)

vale do sÃo francisco wine quimica quimiometria chemometrics vinho sÃo francisco valley

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