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[[: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. | [[: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'' comes from the Greek word λευκός (leukos) meaning white. | ''Leuco'' comes from the Greek word λευκός (leukos) meaning white. | ||
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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 [[:Category:FL63|flavan 3-ol]] oligomers, which are cleaved to anthocyanidins under strongly acidic conditions. | 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 [[:Category:FL63|flavan 3-ol]] oligomers, which are cleaved to anthocyanidins under strongly acidic conditions. | ||
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[[: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、 | [[: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。 | ||
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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。 | 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。 | 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。 | ||
Revision as of 17:01, 12 January 2010
Flavan, Leucoanthocyanidin
| 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-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. 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
Major Plant Families
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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. 各科のカウントは種名でなく文献に記載された属名の数です。文献は代謝物ページのリンクからたどれ、分類はAPG-IIです。左の図が表示されない場合はここをクリックしてください。 |
