Evaluation of physicochemical parameters of grape juices produced in the Serra Gaúcha

The objective of this study was to compare the physicochemical profile of white and purple grape juices through the analysis of reports from the database of an oenological laboratory located in the Serra Gaúcha. The reports of the years 2012 through May of 2016 containing the parameters alcohol, pH, reducing sugars, relative density, titratable acidity, total soluble solids and volatile acidity were used for the statistical evaluation. There was no statistically significant difference regarding the alcohol content and density of white juices compared to purples in any year. Statistically significant pH values were found in the crops of 2014 and 2015. As for the reducing sugars parameter, it was observed a statistically significant difference in the year of 2014. Titratable acidity was statistically significant in all crops. Statistically significant values of total soluble solids were observed in the harvests of 2014 and 2015. The volatile acidity parameter showed statistical significance in the year 2014. The inherent genetic differences between the varieties of grapes used for each juice and the distinct technological processes used in the production are the factors that explain the results