Table 1.

Summarized list of the most relevant phenolic compounds in the parts that make up Grape Pomace (skins, seeds, stems).

Chemical Structure	Phenolic Compounds	Grape Pomace	References
Flavonoid	Procyanidins (polymers of catechin), flavan-3-ol monomers; catechin, epicatechin and oligomers (B1, B2, B3, B4 and the trimer C1)	Seeds and skins	[70,71,72,73,74,75,76,77]
	Prodelphinidins (polymers of gallocatechin), gallocatechin, epigallocatechin, epigallocatechin gallate	Skins	[74,76,77,78]
	Anthocyanins; malvidin-3-O-glucoside, cyanidin-3-O-glucoside, delphinidin-3-O-glucoside, peonidin-3-O-glucoside, and petunidin-3-O-glucoside	Skins and pulp	[24,71,73,75,79]
	Flavonols (quercetin 3-O-glucoside, quercetin 3-glucuronide, myricetin 3-O-glucoside, kaempferol 3-O-glucoside, laricitrin 3-O-glucoside, isorhamnetin 3-O-glucoside, and syringetin3-O-glucoside)	Seeds and skins	[80,81,82]
Non-Flavonoid	Hydroxybenzoic acids (gallic acid, protocatechuic acid, vanillic acid)	Seeds, skins and stems	[83,84]
	Stilbenes (glucosides piceid, resveratrol, astringin, viniferin)	Stems, seeds skins	[73,85,86]
	Hydroxycinnamic acids (caffeic acid, caftaric acid, p-coumaric acid, fertaric acid)	Skins, seeds and stems	[85,87]