- Oenin
- Anthocyanin
- Wine color
- Procyanidin C2
- Phenolic content in wine
- Malvidin
- C23H25O12
- Dictionary of natural phenols and polyphenols molecular formulas
oenin
Oenin GudangMovies21 Rebahinxxi LK21
Oenin is an anthocyanin. It is the 3-O-glucoside 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, whereas it is degraded in the presence of a crude grape PPO extract and of caftaric acid forming anthocyanidin-caftaric acid adducts.
See also
Phenolic compounds in wine
Wine color
Malvidin glucoside-ethyl-catechin
Anthocyanone A, a degradation product of oenin found in wine