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To the phenols counting colorless substance, which is stored in the plant cell wall and thereby causes the lignification (lignification, lat. lignum = wood). He is also responsible for the so-called "yellowing" of paper. Lignin is after the cellulose the second most abundant organic substance in the world. Of course it is also in Oak wood present with a share of over 20% and plays as a precursor flavorings an important role. At the toasting From oak barrels, lignin becomes aromatic aldehydes reduced. The most important is vanillin at the Barrique got into the wine. See also below tannins,

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