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	=Flavonoid=		=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.	+	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). [[Image:FL.gif|thumb|150px|right|Fig.1 The Backbone of Flavonoid Structure]] 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.
	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.		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.

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Revision as of 12:59, 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.

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)