Table 1.

Phenolic compounds in grape pomace.

Phenolic compound	Malbec (red) grape pomace extract (μg/g) [22]	Chardonnay pomace (μg/g dry weight) [21]	Vitaflavan® grape seed extract (mg/g) [23]	Cencibel grape pomace (mg/mL) [24]	Voignier pomace extract (mg/g) [25]	Vidal Blanc pomace extract (mg/g) [25]	Cabernet Franc pomace extract (mg/g) [25]	Chambourcin pomace extract (mg/g) [25]
Gallic acid	252.8 ± 18.5	116 ± 2	9.11 ± 0.10	99.6
Vanillic acid		15 ± 2
Syringic acid	1731.7 ± 156.3
Caffeic acid	16.0 ± 2.6			100.5
(+)-Catechin	3387.5 ± 374.7	670 ± 10	74.54 ± 0.09	99.6	910 ± 10.5	631 ± 13.4	560 ± 4537	214 ± 4.80
(−)-Epicatechin	1763.4 ± 221.8	890 ± 30	67.68 ± 0.75	99.9	625 ± 9.20	451 ± 22.2	215 ± 4.67	109 ± 4.17
(−)-Gallocatechin		1490 ± 40
Epicatechingallate					427 ± 11.7		122 ± 2.99	56.9 ± 5.36
(−)-Epigallocatechin		250 ± 4
(−)-Epigallocatechin gallate		24.2 ± 0.2			96.1 ± 3.47	62.8 ± 0.78	171 ± 7.26
(−)-Epicatechin gallate		28 ± 1
(−)-Epicatechin-3-O-gallate			26.21 ± 0.41
Gallocatechin gallate					99.1 ± 1.29		232 ± 3.19	146 ± 3.37
Trans-resveratrol		26.3 ± 0.5
Quercetin-3-glucoside	112.2 ± 12.1
Quercetin-3-rhamnoside					27.1 ± 2.59	33.5 ± 1.57
Quercetin	557.3 ± 83.9			100.9	17.3 ± 0.38	20.7 ± 0.01	56.5 ± 1.95	31.2 ± 2.26
Rutin					255 ± 16.7	435 ± 14.0	343 ± 11.0	99.5 ± 0.39
Tyrosol	34.0 ± 2.7
Trans-resveratrol		26.3 ± 0.5
Procanidin B3			20.39 ± 0.33
Procyanidin B1			60.99 ± 1.42
Procyanidin T2			6.81 ± 0.06
Procyanidin B4			15.04 ± 0.13
Procyanidin B2			45.13 ± 0.95
Procyanidin C1			7.07 ± 0.08
B1-3-O-gallate			0.32 ± 0.04
B2-3-O-gallate			1.80 ± 0.06
B2-3′-O-gallate			1.61 ± 0.00