Evolução dos compostos fenólicos durante a maceração do mosto de uvas Malbec e Syrah submetidas a diferentes processos

Abstract

During two seasons, samples were collected from two varieties of Vitis Vinifera Malbec and Syrah in a vineyard located in Itaara RS at different time of maturation. These grapes were crushed and subjected to two periods of maceration (7 an 14 days). From the moment of crushing until the end of the maceration samples were collected from the most every 48 hours, and analyses for Brix and pH at the time of sampling and further analysis of total polyphenols, anthocyanins and tannins were made after the freezing of the same. The wines produced were analyzed for acidity, pH, alcohol content, total polyphenols, anthocyanins and tannins. The aim was evaluate the influence of the harvest and maceration timing in the phenolic composition in wines from the varieties Malbec and Syrah produced in the central region of Rio Grande do Sul. Through the results allowed observing that as the grape has possibility of develops maturity, associated with a maceration time longer than 7 days, allows the production of wine more concentrated in phenolic compounds. The results show that the time of harvest, the maceration time, the weather conditions in the harvest and genetic factors in the studied grapes has influence in the phenolic composition of wines produced in this region.