Table 3.

Electrochemical parameters extracted from the cyclic voltammetry curves of the seeds, skins, stems and pomace extracts obtained with different solvents (ethanol, ethanol/water and water).

		Peak a		Peak c
	Q	Ep,a	Ip,a	Ep,c	Ip,c
Seeds
Ethanol	2.03 ± 0.19 a	0.46 ± 0.00 a	2.66 ± 0.39 a	0.32 ± 0.00 a	−1.16 ± 0.20 a
Ethanol/water	2.15 ± 0.00 a	0.48 ± 0.00 b	2.79 ± 0.08 a	0.31 ± 0.00 a	−1.13 ± 0.02 a
Water	2.03 ± 0.07 a	0.41 ± 0.00 c	3.00 ± 0.14 b	0.35 ± 0.00 b	−1.49 ± 0.03 b
Skins
Ethanol	1.06 ± 0.04 a	0.48 ± 0.00 a	1.31 ± 0.04 a	0.45 ± 0.00 a	−0.43 ± 0.05 a
Ethanol/water	1.73 ± 0.03 b	0.49 ± 0.00 b	2.25 ± 0.15 b	0.27 ± 0.00 b	−1.06 ± 0.15 b
Water	1.11 ± 0.08 a	0.44 ± 0.00 c	1.14 ± 0.09 a	0.34 ± 0.00 c	−0.81 ± 0.10 c
Stems
Ethanol	1.65 ± 0.01 a	0.41 ± 0.01 a	1.63 ± 0.05 a	0.27 ± 0.00 a	−0.79 ± 0.01 a
Ethanol/water	2.22 ± 0.02 b	0.47 ± 0.00 b	2.45 ± 0.01 b	0.29 ± 0.00 a	−1.17 ± 0.01 b
Water	1.46 ± 0.01 c	0.42 ± 0.00 a	1.56 ± 0.03 a	0.29 ± 0.00 a	−0.86 ± 0.00 c
Pomace
Ethanol	1.34 ± 0.02 a	0.49 ± 0.00 a	2.21 ± 0.01 a	0.27 ± 0.00 a	−0.95 ± 0.02 a
Ethanol/water	1.48 ± 0.02 b	0.48 ± 0.00 b	2.02 ± 0.00 b	0.27 ± 0.00 a	−0.98 ± 0.03 a
Water	0.72 ± 0.00 c	0.42 ± 0.01 a	1.23 ± 0.03 c	0.33 ± 0.00 b	−0.67 ± 0.00 c

Each value represents the mean (n = 3) ± SD. For the same byproduct, different letters in the same column indicate significant differences by Tukey’s test (p < 0.05). E_p,a (the anodic peak potential) and E_p,c (the cathodic peak potential) are expressed as V, and I_p,a (the anodic peak current) and I_p,c (the cathodic peak current) as μA. Q: the anodic current area.