Efficacy and Safety of a Novel Herbal Medicine in the Treatment of Irritable Bowel Syndrome: A Randomized Double-Blinded Clinical Trial

Table 4

Composition of essential oil with retention time and percentage of each compound.

Compounds	EO			RI
	ZM%	TA%	AG%
α-Pinene	2.42	0.24	1.10	931
β-Pinene	—	1.48	0.80	980
Myrcene	1.53	0.46	—	986
α-Phellandrene	—	—	15.76	1008
ρ-Cymene	8.64	21.67	0.89	1021
Limonene	—	—	16.85	1032
β-Phellandrene	—	—	3.32	1037
γ-Terpinene	12.27	20.31	—	1055
Linalool	3.52	—	—	1096
Dill ether	—	—	5.29	1190
trans-dihydrocarvone	—	—	8.34	1205
Carvacrol methyl ether	1.12	—	—	1240
D-Carvone	—	—	33.18	1247
Thymol	30.34	50.26	—	1292
Carvacrol	28.84	1.34	—	1304
Dill apiol	—	—	6.80	1628

EO: essential oil; ZM: Zataria multiflora Boiss; TA: Trachyspermum ammi L.; AG: Anethum graveolens L.; RI: the retention index of compounds on the HP-5 column.