Category:FL6
| Line 27: | Line 27: | ||
{{Twocolumn| | {{Twocolumn| | ||
| − | [[:Category:FL6D|Flavan 3,4-diol]] | + | [[:Category:FL6D|Flavan 3,4-diol]] and [[:Category:FL64|Flavan 4-ol]] are called leucoanthocyanidin meaning a precursor (white state) of (colored) anthocyans. The term was first used by Rosenheim in 1920. |
| − | ''Leuco'' | + | ''Leuco'' comes from the Greek word λευκός (leukos) meaning white. |
| − | comes from the Greek word λευκός (leukos) meaning white. | + | </p><p> |
| + | 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''. On the other hand, proanthocyanidins are [[:Cateogory:FL63|flavan 3-ol]] oligomers, which are cleaved to anthocyanidins under strongly acidic conditions. | ||
| | | | ||
| − | [[:Category:FL6D|Flavan 3,4-diol]] はロイコアントシアニジンと呼ばれ、 | + | [[:Category:FL6D|Flavan 3,4-diol]] と [[:Category:FL64|Flavan 4-ol]] はロイコアントシアニジンと呼ばれ、 |
植物色素アントシアンの前駆体です。この言葉をはじめて用いたのはRosenheim (1920)で、"ロイコ"とはギリシャ語λευκόςで「白」を意味します。 | 植物色素アントシアンの前駆体です。この言葉をはじめて用いたのはRosenheim (1920)で、"ロイコ"とはギリシャ語λευκόςで「白」を意味します。 | ||
| + | </p> | ||
| + | <p> | ||
| + | より詳しくいうと、ロイコアントシアニジンは単量体を意味し、アントシアニジン合成酵素と呼ばれる2-オキソグルタル酸、鉄依存型オキシゲナーゼ（ヘム非依存型）によりアントシアニジンへ変換されます。 | ||
| + | プロアントシアニジンという言葉がありますが、こちらは[[:Category:FL63|flavan 3-ol]] のオリゴマー（ポリマー）を意味し、強酸下でアントシアニジンに分解されます。 | ||
}} | }} | ||
* Rosenheim O. ''Biochem. J.'', 14, 178-188, 1920. | * Rosenheim O. ''Biochem. J.'', 14, 178-188, 1920. | ||
Revision as of 11:15, 14 October 2008
Flavan
| Flavonoid Top | Molecule Index | Author Index | Journals | Structure Search | Food | New Input |
Upper classes : FL Flavonoid
| 2nd Class | |||
|---|---|---|---|
| FL6F | Flavan hydroxy-, methoxyflavan, diffutidin etc. |
FL63 | Flavan 3-ol (epi)catechin, (epi)fisetinidol, mesquitol, etc. |
| FL64 | Flavan 4-ol apiforol, luteoforol etc. |
FL6D | Flavan 3,4-diol leucoanthocyanidin etc. |
Catechins refer to a subgroup of Flavan 3-ol derivatives (FL63AC). In a stricter sense, it means (+)-Catechin and its stereoisomer (-)-Epicatechin.
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. On the other hand, proanthocyanidins are flavan 3-ol oligomers, which are cleaved to anthocyanidins under strongly acidic conditions.
- Rosenheim O. Biochem. J., 14, 178-188, 1920.
Database statistics データベース統計
