Table 2.

Antioxidant potency composite index of 14 CPFEs (mg TE/g DW).

Cultivars	DPPH	ABTS	FRAP	CUPRAC	APC (%)	Rank
Satsuma orange	55.12 ± 0.08a	17.15 ± 0.22h	76.25 ± 0.75c	25.87 ± 0.27d	87.68	3
Chachiensis	43.19 ± 0.11c	20.12 ± 0.12e	88.84 ± 1.13a	25.87 ± 0.17d	89.13	2
Ponkan	27.44 ± 0.24i	21.37 ± 0.15b	79.30 ± 1.11b	25.03 ± 0.06e	79.99	6
Lane late navel orange	32.67 ± 0.16g	21.04 ± 0.16bc	53.59 ± 0.43g	18.87 ± 0.12h	69.51	9
Blood orange	36.03 ± 0.13e	20.36 ± 0.06de	66.99 ± 1.20e	21.02 ± 0.10g	75.87	7
Apple pomelo	17.95 ± 0.24l	21.42 ± 0.08b	25.18 ± 0.60jk	8.39 ± 0.05k	46.33	12
Majia pomelo	20.18 ± 0.38k	22.35 ± 0.11a	28.51 ± 0.60i	10.76 ± 0.11i	51.34	11
Grapefruit	53.73 ± 0.10b	21.25 ± 0.06b	74.68 ± 0.86c	27.04 ± 0.35c	92.19	1
Dekopon	34.71 ± 0.11f	20.07 ± 0.08e	63.75 ± 1.32f	34.71 ± 0.11a	73.59	8
Fertile orange	37.48 ± 0.18d	20.84 ± 0.07c	71.15 ± 1.61d	23.39 ± 0.05f	80.26	5
Lemon	43.16 ± 0.18c	18.95 ± 0.24f	74.95 ± 0.26c	29.35 ± 0.13b	86.86	4
Sichuan kumquat	23.96 ± 0.56j	17.72 ± 0.11g	27.82 ± 0.37ij	9.51 ± 0.03j	46.62	13
Longyan kumquat	28.94 ± 0.13h	20.73 ± 0.12cd	35.80 ± 0.80h	11.01 ± 0.08i	55.77	10
Bergamot	17.51 ± 0.34l	15.85 ± 0.09i	23.78 ± 0.56k	8.60 ± 0.06k	39.69	14

DPPH, free radical scavenging properties by diphenyl-1-picrylhydrazyl radical; ABTS, 2,2′-azino-bis (3-ethylbenzthiazoline-6-sulfonic acid); FRAP, ferric reducing antioxidant capacity; CUPRAC, cupric reducing antioxidant capacity.

Data are shown as the mean ± SD (n = 3). The APC index is the average of the antioxidant potency composite index in all tested CPFEs, and APC index = (measured score / maximum score) ×100%. Different letters above the error bars in the same column indicate significant differences among varieties based on Tukey's test (P <0.05).