Table 6.

Correlation between Polyphenolic Compounds and Antioxidant Capacity of Grape Fruits Depending on the Cultivation Method.

	DPPH	FRAP	ABTS	ORAC
Farming methods—organic
GRP (cis- and trans- isomers)	0.14	0.22	0.00	0.08
Caftaric acid (cis- and trans- isomers)	−0.44	−0.04	0.20	−0.21
Coutaric acid (cis- and trans- isomers)	0.29	0.57	0.23	−0.05
Coutaric acid (cis- and trans- isomers)	−0.38	0.15	−0.02	−0.30
Fertaric acid	0.45	0.44	0.27	0.48
Gallic acid	0.33	0.35	0.67 *	0.33
Procyanidin dimer B1	−0.06	0.16	−0.04	0.14
(+)-Catechin	0.15	−0.31	−0.47	0.29
Procyanidin dimer B2	−0.01	0.03	−0.11	−0.67
(−)-Epicatechin	0.08	0.64	0.44	−0.30
Farming methods—conventional
GRP (cis- and trans- isomers)	−0.53	−0.58	−0.19	0.02
Caftaric acid (cis- and trans- isomers)	0.05	−0.34	−0.06	0.08
Coutaric acid (cis- and trans- isomers)	−0.08	0.78	0.66	−0.63
Coutaric acid (cis- and trans- isomers)	0.13	−0.49	−0.04	−0.08
Fertaric acid	0.62	0.80	−0.46	0.36
Gallic acid	0.05	0.83	0.39	0.46
Procyanidin dimer B1	−0.46	−0.40	-0.36	0.66
(+)-Catechin	−0.17	−0.36	-0.31	0.41
Procyanidin dimer B2	0.25	0.07	-0.69	−0.05
(−)-Epicatechin	−0.02	0.47	0.19	−0.79

* Significant p-values are in (red font).