Enin Raghuvanshi
Oenin is an anthocyanin. It is the 3-''O''-glucoside A glucoside is a glycoside that is chemically derived from glucose. Glucosides are common in plants, but rare in animals. Glucose is produced when a glucoside is hydrolysed by purely chemical means, or decomposed by fermentation or enzymes. Th ... of malvidin (malvidin-3-O-glucoside). It is one of the red pigments found in purple grape skins and red wine. Color stabilization of oenin at a higher pH can be explained by self-aggregation of the flavylium cation and copigmentation with the Z-chalcone form. In the presence of procyanidin C2, the red color of oenin appears more stable. However, the HPLC chromatogram shows a decrease in the amplitude of the peaks of oenin and procyanidin C2. Concomitantly, a new peak appears with a maximal absorption in the red region. This newly formed pigment probably comes from the condensation of oenin and procyanidin C2. Oenin alone is not oxidized in the presence of grape polyphenol oxidase ...
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