Flavonoids are synthesized by the phenylpropanoid metabolic pathway in which the amino acid phenylalanine is used to produce 4-coumaroyl-CoA. [1] This can be combined with malonyl-CoA to yield the true backbone of flavonoids, a group of compounds called chalcones, which contain two phenyl rings. Conjugate ring-closure of chalcones results in the familiar form of flavonoids, the three-ringed structure of a flavone. The metabolic pathway continues through a series of enzymatic modifications to yield flavanones → dihydroflavonols → anthocyanins. Along this pathway, many products can be formed, including the flavonols, flavan-3-ols, proanthocyanidins (tannins) and a host of other various polyphenolics.
Flavanoids can possess chiral carbons. Methods of analysis should take this element into account [2] especially regarding bioactivity or enzyme stereospecificity. [3]
The biosynthesis of flavonoids involves several enzymes.
Path to cyanidin:
Path to (–)-epicatechin:
Path to (+)-catechin:
Path to flavones:
Path to flavonols:
Path to 3-deoxyanthocyanidins: