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To the anthocyanins counting dye; look there.

Water-soluble plant dyes that are found in almost all higher plants and give the flowers and fruits the red, violet, blue or blue-black color. They belong to the group of phenols (Polyphenols), as well as the large group of dyes of over 6,500 species flavonoids, The name comes from the Greek terms anthos (blossom, flower) and kyáneos (dark blue). Anthocyanins are the ones glycosides (Sugar compounds) of the sugar-free anthocyanidins, the actual dye components. The attached sugar molecules (Glycone) cause the color pigments to be water-soluble. About 250 different anthocyanins are known. In the wine it is mainly the glycosides of cyanidin Delphinidine malvidine. peonidin and petunidine.

The colors of anthocyanins are strong from PH value dependent. In the acidic environment, the red color predominates, in the basic there are mainly blue and violet tones. Anthocyanins are sensitive to light and temperature and are susceptible to higher pH values - below 3 they are the most stable. At pH values between 6 and 7 they are present as flavenols and are rather blue, between 7 and 8 purple. From pH values above 8, the molecule is converted to a yellow chalcon. The anthocyanins of the grape form during the veraison, where the green grapes turn dark. In most varieties, the dyes...

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