Table 3.

Correlation coefficients among phenolic contents and antioxidant activities

	TP	TFO	TFA	TAC	DPPH
Fresh skins
TFO	0.994**
TFA	0.954**	0.964**
TAC	0.113	0.104	− 0.111
DPPH	0.745	0.736	0.569	0.737
Dp	0.951**	0.948**	0.858*	0.415	0.917**
Pt	0.768	0.762	0.605	0.724	0.998**
Mv	0.317	0.309	0.097	0.978**	0.865*
3',4',5'-	0.281	0.272	0.059	0.985**	0.845*
Nonmet	0.340	0.332	0.121	0.973**	0.877*
Cm	0.988**	0.987**	0.929**	0.264	0.842*
Cf	0.928**	0.925**	0.821*	0.476	0.943**
Pomace skins
TFO	0.995**
TFA	0.999**	0.990**
TAC	− 0.961**	− 0.984**	− 0.949**
DPPH	0.962**	0.985**	0.951**	− 0.952**
Cm	0.973**	0.945**	0.981**	− 0.872*	0.874*
Fresh seeds
TFO	0.999**
TFA	0.914*	0.932**
DPPH	0.996**	0.996**	0.921**
Pomace seeds
TFO	1.000**
TFA	0.921**	0.924**
DPPH	0.977**	0.979**	0.976**

* and ** represent significance at P < 0.05 and P < 0.01, respectively

TP total phenolics, TFO total flavonoids, TFA total flavan-3-ols, DPPH DPPH radical scavenging capacities, Dp delphinidin, Pt petunidin, Mv malvidin, 3',4',5'- trihydroxylated anthocyanins including Dp-, Pt- and Mv-derivatives, Nonmet nonmethylated anthocyanins including Dp- and Cy –derivatives, Cm 6-coumaroyl, Cf 6-caffeoyl