Table 1.

Chemical Composition of Ginger Essential Oil (Zingiber officinale) Analyzed by Gas chromatography

Components	trA	n	m	Dn	trn	trm	IKA	%
α-Pinene	6.45	9	10	1	5.54	8.64	929.35	3.39
Camphene	6.96	9	10	1	5.54	8.64	945.81	9.55
D-Limonene	9.63	9	10	1	5.54	8.64	1031.94	1.99
β-Phellandrene	9.70	10	11	1	8.64	12.58	1026.90	6.83
Eucalyptol	9.75	10	11	1	8.64	12.58	1028.17	6.68
Borneol	15.52	11	12	1	12.58	16.91	1167.90	1.08
p-mentol-1-en-8-ol	16.52	11	12	1	12.58	16.91	1190.99	1.27
δ-Citronellol	17.90	12	13	1	16.91	21.31	1222.50	0,28
δ-Citral	18.40	12	13	1	16.91	21.31	1233.86	10.25
Trans-Geraniol	18.93	12	13	1	16.91	21.31	1245.91	4.47
Citral	19.70	12	13	1	16.91	21.31	1263.41	17.25
NerolAcetate	24.47	13	14	1	21.31	25.61	1373.49	6.37
Benzene	28.71	14	15	1	25.61	29.72	1475.43	6.18
(-)Zingiberene	29.29	14	15	1	25.61	29.72	1489.54	7.57
α-Farnesene	29.7	14	15	1	25.61	29.72	1499.51	3.63
Cyclohexene	29.81	15	16	1	29.72	33.64	1502.30	2.29
β-Sesquiphellandrene	30.44	15	16	1	29.72	33.64	1518.37	4.57

n, number of alkane carbons eluting before "i"; m, number of alkane carbons eluting after "i"; Dn, "m"-"n"; tri, retention time of i (sample); trn, retention time of standard "n" (standard before); trm, retention time of pattern "m" (pattern after); IKA, 100*n + 100*Dn* (trA-trn/trm-trn); %, Percent of the compound.