Table 3.

Pearson’s correlation coefficients (r) between total phenolic content (TPC), individual phenolic compound contents and antioxidant activities of olive leaf extracts of different genotypes.

	TPC	TEAC	FRAP	DPPH (EC50)	Emulsion Oxidation a
Hydroxytyrosol	0.614	0.555	0.461	−0.225	0.369
Luteolin glycoside 1	0.359	0.518	0.395	−0.190	0.525
Verbascoside	0.043	0.303	0.218	−0.363	−0.018
Luteolin glycoside 2	0.179	0.107	−0.014	−0.148	0.352
Luteolin 7-O-glucoside	0.669 *	0.666 *	0.728 *	−0.570	0.903 **
Apigenin glycoside	0.040	0.201	−0.204	0.117	−0.186
Apigenin 7-O-glucoside	0.227	0.252	−0.014	−0.171	−0.186
Luteolin 4′-O-glucoside	0.689 *	0.699 *	0.833 **	−0.544	0.846 **
Luteolin glycoside 3	0.464	0.552	0.436	−0.095	0.806 **
Oleuropein	0.744 *	0.664 *	0.836 **	−0.674 *	0.608
Luteolin glycoside 4	−0.004	−0.149	0.024	−0.049	0.380
Quercetin	−0.104	−0.480	−0.024	−0.059	0.140
TPC	1	0.746*	0.885 **	−0.824 **	0.737 *
TEAC		1	0.789 **	−0.676*	0.582
FRAP			1	−0.873 **	0.748 *
DPPH (EC50)				1	−0.485

^a Non-oxidized β-carotene after 180 min of reaction. * Correlation is significant at p < 0.05. ** Correlation is significant at p < 0.01.