Table 1.

Chemical composition of the essential oil of Zingiber cassumunar.

NO.	RRIa	RIlitb	compounds	relative content (%)c	identification
1	933	924	α-thujene	0.47	MS, RI
2	942	932	α-pinene	1.33	MS, RI
3	982	969	sabinene	49.90	MS, RI
4	988	974	β-pinene	2.60	MS, RI
5	993	988	myrcene	1.60	MS, RI
6	1025	1014	α-terpinene	1.89	MS, RI
7	1032	1022	o-cymene	0.28	MS, RI
8	1037	1024	limonene	0.47	MS, RI
9	1040	1025	β-phellandrene	0.84	MS, RI
10	1042	1026	cineole	0.17	MS, RI
11	1067	1054	γ-terpinene	3.79	MS, RI
12	1077	1065	trans-4-thujanol	0.91	MS, RI
13	1098	1086	terpinolene	0.71	MS, RI
14	1109	1098	trans-4-thujanol	0.80	MS, RI
15	1133	1118	cis-p-menth-2-en-1-ol	0.44	MS, RI
16	1151	1136	trans-p-menth-2-en-1-ol	0.25	MS, RI
17	1192	1174	(−)-terpinen-4-ol	13.51	MS, RI, NMR
18	1203	1186	α-terpineol	0.26	MS, RI
19	1220	1207	trans-piperitol	0.12	MS, RI
20	1361	1346	α-terpinyl acetate	0.25	MS, RI
21	1508	1493	α-zingiberene	0.26	MS, RI
22	1540	1521	β-sesquiphellandrene	1.59	MS, RI
23	1643		(E)-1-(3,4-dimethoxyphenyl)butadiene	10.31	NMR
Total				92.75
Monoterpene hydrocarbons				63.88
Oxygenated monoterpenes				27.02
Sesquiterpene hydrocarbons				1.85

The essential oil was diluted with n-hexane as a concentration of 2%.

^aRelative retention index calculated using a series of n-alkanes (C₈–C₃₀) on the HP-5 capillary column.

^bLiterature relative index.

^cRelative content calculated using peak normalization method by GC-FID.