Evaluation of the Chemical Composition and Antioxidant Activity of the Peel Oil of Citrus nobilis

Figures & data

Table 1 Chemical composition of the peel oil of C. nobilis

		GC			FID
No	Compounds	% Area	Exp. RT ^a	Exp. RI ^b	% Area	RI ^c	Ident. RI ^d
1	α-Thujene	0.18	4.96	929	0.73	931	930
2	α-Pinene	1.08	5.14	936	0.30	940	939
3	β-Pinene	0.77	6.32	954	0.21	960	956
4	Myrcene	2.38	6.79	995	2.22	993	991
5	Limonene	76.77	8.26	1032	86.17	1031	1029
6	γ-Terpinene	8.24	9.18	1067	4.02	1063	1060
7	Terpinolene	0.71	10.25	1091	0.27	1090	1089
8	Linalool	3.01	11.02	1102	1.46	1099	1097
9	Terpinen-4-ol	0.73	14.17	1189	0.29	1175	1177
10	Methyl chavicol	3.65	15.01	1201	1.62	1192	1196
11	Exo-Fenchyl Acetate	0.33	16.23	1236	1.44	1228	1233
12	Perilla aldehyde	0.39	18.19	1274	0.47	1269	1272
13	β-Elemene	0.36	23.01	1396	0.59	1395	1391
14	E,E-α-Farnesene	0.51	27.83	1511	0.21	1508	1506
	Total Identification	99.11			100.00
	Compound Classes	% Area			% Area
	Monoterpenes	90.13			90.23
	Monoterpenoids	8.11			5.28
	Sesquiterpenes	0.87			0.80
^aExp. RT: experimental retention time (as minutes); ^bExp. RI: experimental retention indices; ^cRI: retention indices; and ^dIdent. LRI: identification library retention indices.

Table 2 Antioxidant activity of the peel oil of C. nobili s. ^a

	Sample concentration (mg.ml^−1)	Essential Oil	BHT ^b	TOC ^c
β-Carotene Linoleic Acid (%)	0.50	71.21 ± 1.29	98.13 ± 0.76	97.71 ± 0.52
	2.00	86.78 ± 0.53	–	–
	8.00	94.62 ± 0.31	–	–
	20.00	96.80 ± 0.16	–	–
DPPH (%)	0.025	–	92.26 ± 0.87	76.75 ± 0.48
	0.25	18.95 ± 0.46	–	–
	0.50	48.46 ± 1.23	–	–
	1.00	82.51 ± 0.59	–	–
	1.50	96.44 ± 0.10	–	–
Reducing power (%)	1.00	0.29 ± 0.07	3.379 ± 0.043	2.181 ± 0.033
	2.00	0.36 ± 0.05	–	–
	4.00	0.79 ± 0.03	–	–
	6.00	1.26 ± 0.05	–	–
Chelating effect (%)	0.0625	48.13 ± 0.52	19.01 ± 0.52	42.40 ± 0.74
	0.125	62.21 ± 1.14	30.19 ± 1.01	44.72 ± 0.39
	0.25	89.44 ± 0.88	41.39 ± 0,64	50.70 ± 1.18
	0.50	92.26 ± 0.13	68.20 ± 1.25	56.55 ± 0.66
^aValues expressed are means ± S.D. of three parallel measurements; ^bBHT: butylated hydroxy toluene; and ^cTOC: α-Tocopherol.