Caractérisation des productions vitivinicoles des terroirs du Barolo (Piemonte, Italie)

One cultivar could produce distinct wines with typical properties and qualities different depending on its cultivated and its mesoclimatic conditions.

Recurring heat and drought episodes during the growing season can produce adverse impacts on grape production in many wine regions around the world.

Recurring heat and drought episodes during the growing season can produce adverse impacts on grape production in many wine regions around the world.

A consequence of climate change is the modification of grape harvest quality and physico-chemical parameters of the obtained wine: increase in alcoholic degree, decrease in pH, and modification of the extractability of macromolecules, which leads to problems of microbiological, tartaric, colour and colloidal stability. In order to respond to these problems, the winemaking processes must be anticipated and adapted with a better knowledge of macromolecule extractability in grapes and their evolution, according to the grape variety, vintage and winemaking process. The purpose of this study was to understand 1) how the harvest date can influence the extractability of macromolecules, polysaccharides and phenolic compounds, which are responsible for wine stability 2) how to adapt the winemaking process to the harvest date in order to optimise wine quality.

The knowledge about the molecular fraction associated to white wines oxidative stability is still poorly understood.