Melanin: nf Melanin is a dark brown pigment affecting grape must (or oxidized wine). This coloring is the result of the enzymatic oxidation of phenolic compounds in the must (anthocyanins, tannins, etc.) resulting in the formation of quinones. Tannins are indeed polyphenols. By oxidizing, they form quinones which polymerize (formation of a large molecule from several molecules) into melanin. Thus, if the oxidation of the musts is not controlled ...
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