Category:FL

Revision as of 00:26, 17 March 2008

Figure 1: The Backbone of Flavonoid Structure

FL: 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, is linked to a hydroxyl group in the A-ring to form the C-ring. The class of flavonoids are usually determined by the modification pattern of the C-ring (Table 1).

1st Class
FL1:Aurone and Chalcone	FL2:Flavanone	FL3:Flavone
2nd Class FL1A Aurone FL1B Auronol FL1C Chalcone FL1D Dihydrochalcone	FL2F: Flavanone	FL3F: Flavone
FL4: Dihydroflavonol	FL5: Flavonol	FL6: Flavan
FL4D: Dihydroflavonol	FL5F: Flavonol	2nd Class FL6F Flavan FL63 Flavan 3-ol FL64 Flavan 4-ol FL6D Flavan 3,4-diol
FL7: Anthocyanin	FLI: Isoflavonoid	FLN: Neoflavonoid
2nd Class FL7A Anthocyanin FL7D 3-Desoxyanthocyanin	2nd Class FLIA Isoflavone FLIB Isoflavanone FLIC Isoflavan FLID Pterocarpane FLIE Coumestan FLIF Rotenoid FLIG Coumaranochromone FLIH 3-Arylcoumarin FLII 2-Arylbenzofuran FLIJ alpha-Methoxynbenzoin	2nd Class FLNA 4-Arylcoumarin FLNB 4-Arylchroman FLNC Dalbergiquinol FLND Dalbergione FLNE Neoflavene FLNF Coumarinic acid

Biosynthesis

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.

Records in this database

This database collects original references that report identification of flavonoid in various plant species. The database consists of three major namespaces: (flavonoid) compounds, plant species, and references.

Familiar examples

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