Nitrogen compounds in must and volatile profile of white wine: Influence of clarification process before alcoholic fermentation.

The aim of this study was to investigate the effect of adding a fining agent to the must in relation to the fermentation kinetics and the volatile composition of the wine produced. Three fining agents, bentonite, pectinolytic enzyme and silica were applied, separately, to samples of Chardonnay must. It was observed that the addition of a fining agent had a significant influence on the must and wine composition. The must clarified with bentonite showed the lowest nitrogen content and the enzyme addition led to the highest nitrogen content. During the fermentation process, a difference in the consumption rate was observed for each amino acid in relation to the fining agent used in the process. In relation to the volatile composition, the wine produced had different characteristics according to the fining agent added to the must, which was confirmed by separation of the samples using principal component analysis.