Essential Oil Extracted from Cymbopogon citronella Leaves by Supercritical Carbon Dioxide: Antioxidant and Antimicrobial Activities

Table 4

Chemical compositions of essential oils.

No.	Components	Concentration of essential oil (%)
		HD	SFE
1	α-Pinene	0.71	0.67
2	β-Pinene	4.31	6.00
3	D-Limonene	0.2	3.55
4	β-Ocimene	ND	0.15
5	8-Methyl, 1-hendecene	ND	0.18
6	α-Guaiene	0.25	0.45
7	β-Caryophyllene	2.46	0.1
8	α-Bergamotene	ND	ND
9	3-Carene	0.46	ND
10	α-Cubebene	0.94	0.46
11	α-Muurolene	0.26	0.3
12	γ-Muurolene	1.67	0.2
13	α-Copaene	1.29	1.13
14	β-Bourbonene	1.97	ND
15	β-Guaiene	0.14	ND
	Hydrocarbons	14.66	13.19
16	Hinesol	0.91	2.8
17	2-Borneol	ND	0.76
18	Isopulegol	0.35	0.18
19	trans-Verbenol	ND	0.33
20	cis-Verbenol	0.46	0.95
21	Nerol	0.35	0.19
22	Geraniol	9.39	6.43
23	trans-Farnesol	ND	1.34
24	Geraniol	25.45	10.22
25	trans-Geranylgeraniol	0.4	1.31
26	3-Methyl cyclohexanol	0.71	2.01
27	cis-Geranylgeraniol	0.35	ND
28	Globulol	1.37	0.55
29	γ-Eucalyptol	ND	0.80
30	Carotol	0.37	ND
31	α-Cadinol	0.25	1.47
32	Cubenol	0.55	3.41
	Alcohols	40.91	32.75
33	Citronellal	12.77	12.57
34	Lauraldehyde	0.3	0.13
35	Neral	11.15	15.11
36	Geranialdehyde	15.12	20.02
	Aldehydes	39.34	47.83
37	Citronellyl acetate	ND	0.23
38	Citronellyl isobutyrate	0.61	1.27
39	Geraniol acetate	2.24	0.65
	Esters	2.85	2.15
40	D-Carvone	ND	0.15
41	D-Verbenone	ND	0.30
	Ketones	0	0.45
42	Hexadecane	0.19	ND
43	Dioctylmethane	ND	0.40
	Alkanes	0.19	0.40
44	Rose oxide	ND	0.10
45	Geranic acid	ND	0.14
46	Eugenol	0.17	0.33
47	2-Epoxy-trans-p-menthane	ND	0.39
48	Caryophyllene oxide	1.57	0.41
49	3-Decyne	0.19	ND
	Others	1.74	1.37
Total identified	99.69	98.14

ND, not detected.