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Upper classes : FL Flavonoid
hydroxy-, methoxyflavan, diffutidin etc.
(epi)catechin, (epi)fisetinidol, mesquitol, etc.
apiforol, luteoforol etc.
Flavan 3-ol is often called flavanol.
Flavan 3,4-diol and Flavan 4-ol are called leucoanthocyanidin meaning a precursor (white state) of (colored) anthocyans. The term was first used by Rosenheim in 1920.
Leuco comes from the Greek word λευκός (leukos) meaning white.
In scientific terms, leucoanthocyanidins refer to monomers, which are converted to anthocyanidins by 2-oxoglutarate iron-dependent oxygenase (i.e., non-haem oxygenase) called anthocyanidin synthase.
Proanthocyanidins are polymers of flavan 3-ol, up to 50 units. They are cleaved to anthocyanidins under strongly acidic conditions. Proanthocyanidins that consist exclusively of (epi)catechins are called also procyanidins.
Database statistics データベース統計
Major Plant Families
| The number in each family is counted as the number of genera (not species) listed in our registered references. Each reference record is accessible by clicking the link in compound pages. The taxonomy follows the APG-II classification. For details (or if the figure is broken), visit this page.|