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Tannin

The general name for a group of naturally occurring astringent polyphenols that are an important part of wine, particularly red wine. In wine, tannin are responsible for the astringency and some of the mouth feel of red wine. Part of their importance comes from the fact that tannin interacts with protein molecules by binding to them and often causing them to precipitate. The tannin in red wine actually binds to components in saliva and form a precipitate in your mouth — hence the feel of red wine on your tongue. Tannins are found in grape skins, stems, and seeds. Tannins are also found in oak. Wine stored or fermented in oak barrels will extract some of the tannins.
 Tannin - Wine Glossary


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