Seasonal Variation in Essential Oils Composition and the Biological and Pharmaceutical Protective Effects of Mentha longifolia Leaves Grown in Tunisia
Table 2
Seasonal variation in content and chemical composition of essential oils from leaves of M. longifolia.
ComponentA
Rt (min)
KIC
Area
Spring
Winter
Monoterpene hydrocarbons
α-pinene
8.557
941
0.12±0.008
0.93±0.02
camphene
9.764
953
0.18±0.03
0.41±0.008
β-pinene
9.827
978
0.24±0.02
1.22±0.05
Oxygenated monoterpenes
1,8 cineole
11.492
1030
2.37±0.16
21.3±0.24
L-menthone
15.206
1152
4.68±0.2
10.66±0.1
Iso-menthone
15.429
1163
0.16±0.008
8.69±0.12
Borneol
15.503
1166
2.6±0.02
1.87±0.04
Menthol
15.801
1171
4.29±0.2
0
Cis-isopulegone
17.960
1175
0
0.86±0.04
Pulegone
18.349
1237
38.2±0.28
26.92±0.53
Piperitone
19.539
1251
0
0.82±0.1
Piperitenone
21.324
1340
1.18±0.12
9.62±0.2
cis-Jasmone
22.406
1400
0
0.45±0.02
Sesquiterpene hydrocarbons
trans-Caryophyllene
22.949
1419
0.87±0.04
2.7±0.1
D-germacrene
24.046
1482
0.34±0.008
0
gamma.-Cadinene
25.106
1514
0
0.52±0.08
d-Cadinene
27.607
1523
0.4±0.006
0
delta.-Selinene
27.857
1578
0
0.30±0
Oxygenated sesquiterpenes
alpha.-Humulene
23.659
1454
0
0.2±0
alpha.-Cadinol
28.196
1654
0
2.81±0.05
Esters
Geranyl tiglate
29.260
1685
0
0.24±0.008
Fatty Acids
Palmitic acid
34.729
1927
15.26±0.2
0
Oleic acid
38.002
2128
23.79±0.5
0
Linoleic acid
38.317
2173
3.27±0.01
0
Total compound
97.95
89.91
Compounds listed in order of elution from a HP-5 MS column. Retention time (as minutes). K.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).