Oxovitisin A is an
oxovitisin, a type of
pyranoanthocyanin The pyranoanthocyanins are a type of pyranoflavonoids. They are chemical compounds formed in red wines by yeast during fermentation processes or during controlled oxygenation processes during the aging of wine. The different classes of pyranoant ...
with a pyranone (
2-pyrone) component. It is found in aged
Port wine
Port wine (also known as vinho do Porto, , or simply port) is a Portuguese wine, Portuguese fortified wine produced in the Douro, Douro Valley of Norte, Portugal, northern Portugal. It is typically a sweetness of wine, sweet red wine, often ...
s. It does not contain an oxonium ion component (
flavylium
Pyrylium is a cation (positive ion) with formula , consisting of a six-membered ring of five carbon atoms, each with one hydrogen atom, and one positively charged oxygen atom. The bonds in the ring are conjugated as in benzene, giving it an arom ...
cation), as anthocyanins do. Therefore, it does not have an absorption maximum at 520 nm. Oxovitisins are stable
yellowish
Varieties of the color yellow may differ in hue, chroma (also called saturation, intensity, or colorfulness) or lightness (or value, tone, or brightness), or in two or three of these qualities. Variations in value are also called tints and sha ...
pigments with similar unique spectral features, displaying only a pronounced broad band around 370 nm in the UV−vis spectrum. It is an oxidative derivative of
carboxypyranomalvidin-3-glucoside (vitisin A).
[Oxovitisins: A New Class of Neutral Pyranone-anthocyanin Derivatives in Red Wines. Jingren He, Joana Oliveira, Artur M. S. Silva, Nuno Mateus and Victor De Freitas, J. Agric. Food Chem., 2010, 58 (15), pages 8814–8819, ]
References
Pyranoanthocyanins
Methoxy compounds
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