. 2018 Dec 9;2018:7856517. doi: 10.1155/2018/7856517

Table 2.

Seasonal variation in content and chemical composition of essential oils from leaves of M. longifolia.

Component ^A	Rt (min) ^B	KI ^C	% Area
Component ^A	Rt (min) ^B	KI ^C	Spring	Winter
*Monoterpene hydrocarbons*
α-pinene	8.557	941	0.12±0.008^b	0.93±0.02^a
camphene	9.764	953	0.18±0.03^b	0.41±0.008^a
β-pinene	9.827	978	0.24±0.02^b	1.22±0.05^a
*Oxygenated monoterpenes*
1,8 cineole	11.492	1030	2.37±0.16^b	21.3±0.24^a
L-menthone	15.206	1152	4.68±0.2^b	10.66±0.1^a
Iso-menthone	15.429	1163	0.16±0.008^b	8.69±0.12^a
Borneol	15.503	1166	2.6±0.02^a	1.87±0.04^b
Menthol	15.801	1171	4.29±0.2^a	0^b
Cis-isopulegone	17.960	1175	0^b	0.86±0.04^a
Pulegone	18.349	1237	38.2±0.28^a	26.92±0.53^b
Piperitone	19.539	1251	0^b	0.82±0.1^a
Piperitenone	21.324	1340	1.18±0.12^b	9.62±0.2^a
cis-Jasmone	22.406	1400	0^b	0.45±0.02^a
*Sesquiterpene hydrocarbons*
trans-Caryophyllene	22.949	1419	0.87±0.04^b	2.7±0.1^a
D-germacrene	24.046	1482	0.34±0.008^a	0^b
gamma.-Cadinene	25.106	1514	0^b	0.52±0.08^a
d-Cadinene	27.607	1523	0.4±0.006^a	0^b
delta.-Selinene	27.857	1578	0^b	0.30±0^a
*Oxygenated sesquiterpenes*
alpha.-Humulene	23.659	1454	0^b	0.2±0^a
alpha.-Cadinol	28.196	1654	0^b	2.81±0.05^a
*Esters*
Geranyl tiglate	29.260	1685	0^b	0.24±0.008^a
*Fatty Acids*
Palmitic acid	34.729	1927	15.26±0.2^a	0^b
Oleic acid	38.002	2128	23.79±0.5^a	0^b
Linoleic acid	38.317	2173	3.27±0.01^a	0^b
Total compound			97.95	89.91

^ACompounds listed in order of elution from a HP-5 MS column.

^BRetention time (as minutes).

^CK.I. Kovats Index on HP-5MS column in reference to n-alkanes.

Values in the same line with different subscript (a > b) are significantly different within season (P < 0.05).