Tannin is a natural compound belonging to the polyphenol family. It is found primarily in grapes, specifically in their skins, seeds, and sometimes in the stems (the green stalks that connect the grapes). In wine, tannins also come from the wood of the oak barrels used for aging.
A plant origin
Tannins are present in many plants and play a protective role against insects and diseases. In wine, their presence comes primarily from the maceration of red grapes, when the juice remains in contact with the skins and seeds. The longer the maceration, the higher the tannin concentration.
The role of tannins in wine
Tannins contribute to the structure and complexity of wine. They influence its mouthfeel and play a crucial role in its aging potential. A wine rich in tannins often has a greater capacity for aging, as these compounds act as natural antioxidants, protecting the wine from oxidation.
The sensations in the mouth
In tasting, tannins are responsible for astringency, that sensation of dryness or roughness on the tongue and gums. This is due to their interaction with salivary proteins, which reduces the sensation of lubrication in the mouth.
- Fine, silky tannins bring elegance and roundness.
- Young, firm tannins can give a harsher or more bitter impression.
Tannins and wine styles
- Red wines: these are the richest in tannins, especially those from grape varieties such as Cabernet Sauvignon, Syrah or Nebbiolo.
- White wines: generally low in tannins, except when aged in oak barrels, where the wood can contribute.
- Sparkling wines: almost devoid of tannins, which makes them more lively and fresh.
An essential balance
A good wine is above all a question of balance: the tannins must blend harmoniously with the acidity, alcohol, and aromas. If they are too prominent, they can dominate and make the wine austere; if they are too weak, the wine can lack body and structure.
In short, tannin is much more than just a component of wine: it's a structuring, protective, and sensory element that plays a key role in the tasting experience and the longevity of wines. Learning to recognize and appreciate them allows for a better understanding of wine and its nuances.
