Table 2.

Classification of polyphenols.

Class	Subclass	Polyphenolic Compounds	Refs.
Phenolic Acids	Hydroxycinnamic acids	Rosmarinic acid, caffeoylquinic acid, sinapic acid, ferulic acid, caffeic acid, and p-coumaric acid	[132-135]
	Hydroxybenzoic acids	Ellagic acid and gallic acid	[136, 137]
Flavonoids	Flavanols	Epicatechin, epigallocatechin, epicatechin, and catechins	[138, 139]
	Anthocyanidins	Cyanidin, malvidin, petunidin, peonidin, delphinidin, and pelargonidin	[140-142]
	Flavanones	Eriodictyol, hesperidin, hesperetin, and naringenin	[143, 144]
	Isoflavones	Genistein and daidzein	[145-147]
	Flavones	Luteolin and apigenin	[148]
	Flavonols	Rutin, kaempferol, and quercetin	[149-151]
Stilbenes	Stilbenes	e-Viniferin, piceatannol, and resveratrol	[152, 153]
Lignans	Lignans	Matairesinol, lariciresinol, pinoresinol, secoisolariciresinol, enterolactone, enterodiol, arctigenin, and sesamin	[154, 155]
Other polyphenols	Curcuminoids	Curcumin	[156]
	Hydroxyphenylpropnes	6-Gingerol	[157]