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	<table>		<table>
	<tr>		<tr>
−	<td>[[Image:Fl1c.gif|thumb|150px|Chalcones and Aurones]]</td>	+	<td>[[Image:Fl1c.gif|150px|Aurones and Chalcones]]</td>
−	<td>[[Image:Fl2.gif|thumb|150px|Flavanone]]</td>	+	<td>[[Image:Fl2.gif|150px|Flavanone]]</td>
−	<td>[[Image:Fl3.gif|thumb|150px|Flavone]]</td>	+	<td>[[Image:Fl3.gif|150px|Flavone]]</td>
	</tr>		</tr>
	<tr>		<tr>
−	<td>[[Image:Fl4.gif|thumb|150px|Dihydroflavonol]]</td>	+	<td>[[Image:Fl4.gif|150px|Dihydroflavonol]]</td>
−	<td>[[Image:Fl5.gif|thumb|150px|Flavonol]]</td>	+	<td>[[Image:Fl5.gif|150px|Flavonol]]</td>
−	<td>[[Image:Fl6.gif|thumb|150px|Flavan]]</td>	+	<td>[[Image:Fl6.gif|150px|Flavan]]</td>
	</tr>		</tr>
	<tr>		<tr>
−	<td>[[Image:Fl7.gif|thumb|150px|Anthocyanin]]</td>	+	<td>[[Image:Fl7.gif|150px|Anthocyanin]]</td>
−	<td>[[Image:Fli.gif|thumb|150px|Isoflavonoid]]</td>	+	<td>[[Image:Fli.gif|150px|Isoflavonoid]]</td>
−	<td>[[Image:Fln.gif|thumb|150px|Neoflavonoid]]</td>	+	<td>[[Image:Fln.gif|150px|Neoflavonoid]]</td>
	</tr></table>		</tr></table>

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Revision as of 14:41, 2 March 2008

Flavonoid

Flavonoid is a class of plant secondary metabolites that have two benzene rings (each called A-ring and B-ring) connected by a chain of three carbons (Figure 1). The carbon chain, corresponding to the numbers 2,3,4 in Figure 1, can link to a hydroxyl group in the A-ring to form the C-ring. Flavonoid is structurally classified by the modification pattern of this C-ring.

Aurones and Chalcones	Flavanone	Flavone
Dihydroflavonol	Flavonol	Flavan
Anthocyanin	Isoflavonoid	Neoflavonoid

Flavonoid is synthesized through the phenylpropanoid-acetate pathway in all higher plants. It is responsible for many biological activities including pigments, anti-oxidative or anti-allergic agents, and signaling elements in nodule formation. Some of them are quite familiar in our daily life.

Familiar examples. anthocyanin (blueberry), isoflavone (soybean), rutin (soba noodle), catechin (tea), flavan-diol (tea), naringeninchalcone (tomato), polyphenol (wine, cacao)