Table 1.

Chemical composition of Z. armatum fruit essential oil as shown by GC-MS analysis.

Peak Number	Retention Time (min)	Formula	Compound	Molecular Weight	Retention Indices a	Retention Indices b	Areas c (%)
1	4.78	C10H16	2-thujene	136	968	978	0.1
2	4.9	C10H16	(-)-α-pinene	136	942	936	0.25
3	5.3	C8H16O	2,4-dimethyl-cyclohexanol	128	1032	1032	0.12
4	5.46	C10H16	sabinene	136	967	946	5.79
5	5.53	C10H16	(-)-β-pinene	136	943		0.27
6	5.65	C10H16	β-myrcene	136	983	984	2.04
7	5.82	C8H16O	octanal	128	982	1004	0.06
8	6.08	C10H16	α-terpinene	136	1010	1010	0.33
9	6.27	C10H16	D-limonene	136	1018		11.31
10	6.5	C10H16	β-ocimene	136	1037	1259	0.41
11	6.7	C10H16	γ-terpinene	136	1050	1240	0.5
12	6.84	C10H18O	4-thujanol	154	1093	1109	0.16
13	7.15	C10H16	α-terpinolene	136	1079	1089	0.23
14	7.33	C10H18O	linalool	154	1086	1103	73.57
15	7.47	C10H18O	isothujol	154	1152	1170	0.1
16	7.61	C10H16O	thujone	152	1089	1105	0.07
17	7.67	C10H18O	trans-p-2-menthen-1-ol	154	1112	1108	0.09
18	7.92	C10H18O	cis-p-menth-2-en-1-ol	154	1111	1126	0.07
19	8.07	C10H18O	citronellal	154	1134	1153	0.08
20	8.29	C10H20O	levomenthol	156	1160	1172	0.12
21	8.49	C10H18O	terpinen-4-ol	154	1164	1167	1.39
22	8.68	C10H18O	α-terpineol	154	1175	1183	0.37
23	9.51	C11H18O2	linalyl formate	182	1206	1215	0.08
24	9.61	C10H16O	piperiton	152	1233	1255	0.09
25	11.91	C15H24	caryophyllene	204	1419	1423	0.26
26	12.34	C15H24	humulene	204	1451	1436	0.07
27	12.68	C15H24	germacrene D	204	1477	1482	0.92
28	12.87	C15H24	bicylogermacrene	204	1492	1057	0.25
29	14.89	C15H26O	α-cadinol	222	1642	1635	0.06
Total							99.16

Retention indices ^a = calculated retention index; Retention indices ^b = retention index reported previously; ^c The relative proportions of the essential oil constituents.