Repellent Activities of Essential Oils of Some Plants Used Traditionally to Control the Brown Ear Tick, Rhipicephalus appendiculatus

Table 1

The major chemical components in the essential oils of Tagetes minuta (a) and Tithonia diversifolia (b) identified using capillary column gas chromatography in combination with gas chromatography/mass spectrometry.

(a)

RT (min)	Chemical name	IUPAC name	Molecular formula	M^+ (g/mol)	Density (g/cm^3)	CAS number	Structure	Relative abundance (%)
22.701	cis-Ocimene	3,7-Dimethyl-1,3,7-octatriene	C10H16	136.24	0.800	3338-55-4		43.78
23.126	Dihydrotagetone	2,6-Dimethylocta-7-en-4-one	C10H18O	154.25	0.826	1879-00-1		16.71
29.401	Piperitenone	2-Methyl-6-propan-2-ylidenecyclohex-2-en-1-one	C10H14O	150.22	0.977	491-09-8		10.15
26.476	trans-Tagetone	(5E)-2,6-dimethylocta-5,7-dien-4-one	C10H16O	152.23	0.847	6752-80-3		8.67
29.076	3,9 Epoxy-p-mentha-1,8 (10) diene	3,6-Dimethylidene-4,5,7,7a-tetrahydro-3aH-1-benzofuran	C10H14O	150.22	0.967	494-90-6		6.47
25.851	β-Ocimene	(3E)-3,7-Dimethylocta-1,3,6-triene	C10H16	136.23	0.776	3779-61-1		3.25
26.126	cis-Tagetone	(Z)-2,6-Dimethylocta-5,7-dien-4-one	C10H16O	152.23	0.847	3588-18-9		1.95
35.701	β-Caryophyllene (trans)	4,11,11-Trimethyl-8-methylene-bicyclo[7.2.0]undec-4-ene	C15H24	204.36	0.905	87-44-5		0.84
37.726	Bicyclogermacrene	(1R, 4E,8E, 10S)-4,8,11,11-Tetramethylbicyclo[8.1.0]undeca-4,8-diene	C15H24	204.35	0.861	24703-35-3		0.62
50.626	AR-turmerone	(6S)-2-Methyl-6-(4-methylphenyl)hept-2-en-4-one	C15H20O	216.32	0.945	532-65-0		0.50

(b)

RT (min)	Compound	IUPAC name	Molecular formula	M^+ (g/mol)	Density (g/cm^3)	CAS registry number	Structure	Relative abundance (%)
18.975	𝛼-Pinene	2,6,6-Trimethylbicyclo[3.1.1]hept-2-ene	C10H16	136.24	0.858	2437-95-8		63.64
20.425	β-Pinene	6,6-Dimethyl-2-methylenebicyclo[3.1.1]heptane	C10H16	136.24	0.860	18172-67-3		15.00
35.476	Isocaryophyllene	(1R,4Z,9S)-4,11,11-trimethyl-8-methylidenebicyclo[7.2.0]undec-4-ene	C15H24	204.36	0.893	118-65-0		7.62
38.651	Nerolidol	(6E)-3,7,11-Trimethyl-1,6,10-dodecatrien-3-ol	C15H26O	222.37	0.872	7212-44-4		3.70
36.876	1-Tridecanol	1-Tridecanol	C13H28O	200.36	0.822	112-70-9		1.75
22.200	Limonene	1-Methyl-4-(1-methylethenyl)-cyclohexene	C10H16	136.24	0.841	5989-27-5		1.52
20.150	Sabinene	4-Methylene-1-(1-methylethyl)bicyclo[3.1.0]hexane	C10H16	136.24	0.844	3387-41-5		1.00
34.101	𝛼-Copaene	(1R,2S,6S,7S,8S)-8-Isopropyl-1,3-dimethyltricyclo[4.4.0.0^2,7]dec-3-ene	C15H24	204.36	0.910	3856-25-5		0.95
34.376	𝛼-Gurjunene	(4R,4aR)-1,1,4,7-Tetramethyl-1a,2,3,4,4a,5,6,7b-octahydrocyclopropa[e]azulene	C15H24	204.36	0.918	489-40-7		0.56
41.251	Cyclodecene	6,10-Dimethyl-3-(1-methylethyl)-6-cyclodecene-1,4-dione	C10H18	138.25	0.867	13657-68-6		0.54

Key:
M⁺: molecular weight.
RT: retention time in minutes (min.).
IUPAC: The IUPAC nomenclature system of organic chemistry is a systematic method of naming organic chemical compounds as recommended by the International Union of Pure and Applied Chemistry (IUPAC).
CAS registry numbers: Are unique numerical identifier (values) numbers assigned by the chemical abstracts service (CAS) to every chemical described in the open scientific literature (currently including those chemicals described from at least 1957 through the present) and including elements, isotopes, organic and inorganic compounds, ions, organometallics, metals, nonstructurable materials, and so forth.