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Not to be confused with anthocyanins, the sugar-containing counterparts of anthocyanidins.
Flavylium cation.svg
PubChem 145858
ChemSpider 128674
Jmol-3D images Image 1
Molecular formula C15H11O+
Molar mass 207.247
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references
Molecule in 3D of the anthocyanidin cyanidin

Anthocyanidins are common plant pigments. They are the sugar-free counterparts of anthocyanins based on the flavylium ion or 2-phenylchromenylium, which is a type of oxonium ion (chromenylium is referred also to as benzopyrylium).[1] They form a large group of polymethine dye. In particular anthocyanidins are salt derivatives of the 2-phenylchromenylium cation, also known as flavylium cation. As shown in the figure below, the phenyl group at the 2-position can carry different substituents. The counterion of the flavylium cation is mostly chloride. With this positive charge, the anthocyanidins differ from other flavonoids.


The stability of anthocyanidins is dependent on pH. At a low pH (acidic conditions), colored anthocyanidins are present, whereas at a higher pH (basic conditions) the colorless chalcones forms are present.

Stability of anthocyanidins is dependent on pH.


3-Deoxyanthocyanidins like Luteolinidin are a class of anthocyanidins lacking an hydroxyl group on carbon 3.

Selected anthocyanidins and their substitutions
Anthocyanidin Basic structure (R4' = −OH) R3' R5' - R3 - R5 R6 R7
Pelargonidin Basic structure of Anthocyans: The flavio-cation −H −H −OH −OH −H −OH
Aurantinidin −H −H −OH −OH −OH −OH
Cyanidin −OH −H −OH −OH −H −OH
Peonidin −OCH3 −H −OH −OH −H −OH
Rosinidin −OCH3 −H −OH −OH −H −OCH3
Delphinidin −OH −OH −OH −OH −H −OH
Pulchellidin −OH −OH −OH −OCH3 −H −OH
Europinidin −OCH3 −OH −OH −OCH3 −H −OH
Malvidin −OCH3 −OCH3 −OH −OH −H −OH
Capensinidin −OCH3 −OCH3 −OH −OCH3 −H −OH
Hirsutidin −OCH3 −OCH3 −OH −OH −H −OCH3
Petunidin - −OH −OCH3 −OH −OH −H −OH


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