Table 2.

Antioxidant activity (IC₅₀, µg/mL) evaluated by 2,2-diphenyl-1-picrylhydrazyl (DPPH), 2,2’-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS), β carotene-bleaching test and Relative Antioxidant Capacity Index (RACI) values.

Essential oil	DPPH Test	ABTS Test	β-Carotene-Bleaching Test		RACI
P. armeniaca
P1	83.86 ± 1.25 *	0.47 ± 0.07 *	28.33 ± 0.48 *	20.73 ± 0.54 *	0.48
P2	105.76 ± 2.81 *	0.54 ± 0.06 *	23.05 ± 0.65 *	18.55 ± 0.57 *	0.16
P3	80.05 ± 2.44 *	0.57 ± 0.04 *	22.64 ± 0.46 *	17.30 ± 0.47 *	−0.55
P. domestica
P4	88.33 ± 1.90 *	0.45 ± 0.07 *	14.75 ± 0.56 *	16.19 ± 0.54 *	−0.03
P5	73.78 ± 1.64 *	0.48 ± 0.05 *	14.68 ± 0.51 *	13.07 ± 0.70 *	−1.20
P6	103.32 ± 3.26 *	0.50 ± 0.04 *	11.15 ± 0.43 *	11.39 ± 0.53 *	1.10
Positive control
Ascorbic acid	5.01 ± 0.83	1.70 ± 0.11
Propyl gallate			1.0 ± 0.04	1.0 ± 0.03

Data are expressed as mean ± S.D. (n = 3); DPPH Radical Scavenging Activity Assay; Antioxidant Capacity Determined by Radical Cation (ABTS⁺); β-Carotene bleaching test. Differences within and between groups were evaluated by one-way analysis of variance test followed by a multicomparison Dunnett’s test. DPPH: * p < 0.01; ABTS: * p < 0.01; β-carotene-bleaching test: * p < 0.01.