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Table 1 Essential oil constituents of Mentha piperita L. by HS/SPME and hydrodistillation methods of this study and the comparison of this study results (hydrodistillation and HS/SPME methods) with the previous studies (Ref. (Rohloff 1999) and (Moradi & Najafian 2015)) in this plant

From: Chemical composition analysis of the essential oil of Mentha piperita L. from Kermanshah, Iran by hydrodistillation and HS/SPME methods

No. HS/SPME method Hydrodistillation method Results of other studies
Retention time (min) Compound % Retention time (min) Compound % Ref. (Rohloff 1999) SPME Ref. (Moradi and Najafian 2015)
Hydro D. HS
1 5.171 2-Hexenal 0.08 5.171 2-Hexenal 0.16
2 7.286 α-Pinene 1.55 7.286 α-Pinene 0.79 4.12 0.85 8.06
3 8.749 β-Pinene 2.26 7.645 Camphene 0.02 5.14 1.29 7.67
4 9.315 Myrcene 0.34 8.531 Sabinene 0.42
5 9.812 l-Phellandrene 0.15 8.749 β-Pinene 0.97
6 10.383 α-Terpinene 0.10 9.315 Myrcene 0.18
7 10.578 p-Cymene 0.03 9.56 3-Octanol 0.14
8 10.978 1,8-cineole 9.45 9.812 l-Phellandrene 0.06 20.29   17.85
9 11.601 Δ-3 Carene 0.07 10.383 α-Terpinene 0.29
10 12.047 γ-Terpinene 0.25 10.578 p-Cymene 0.09
11 12.595 trans-sabinene hydrate 1.28 10.692 Dl-limonene 2.22 9.32 3.11 13.36
12 13.264 Terpinolen 0.12 10.978 1,8-cineole 4.46 6.30
13 14.15 iso-amyl isovalerat 0.44 11.601 Δ-3 Carene 0.18 a a a
14 15.093 Neo-allo-ocimene 0.03 12.047 γ-Terpinene 0.47
15 16.785 L-menthone 16.88 12.595 trans-sabinene hydrate 0.61 16.08 18.75
16 17.036 Menthofuran 11.38 13.264 Terpinolen 0.14 3.33 3.98
17 17.179 Neo-menthol 2.37 14.15 iso-amyl isovalerate 0.15 a a a-
18 18.242 L-menthol 29.38 14.464 Thujone 0.01 16.65 9.28
19 20.94 Piperitone 0.46 16.785 L-menthone 16.04 34.86
20 21.694 3-menthene 0.92 17.036 Menthofuran 8.91 5.11
21 22.883 cis-carane 14.39 17.179 Neo-menthol 4.24 23.98
22 23.231 Neoisomenthyl acetate 1.02 18.242 L-menthol 45.34
23 24.226 Bicycloelemene 0.16 20.025 Pulegone 0.80
24 25.472 α-Farnesene 0.01 20.94 Piperitone 0.61
25 25.643 Ylangene 0.01 21.694 3-menthene 0.42
26 25.849 Copaene 0.09 22.883 cis-carane 8.70
27 26.278 β-Bourbonene 0.96 23.231 Neoisomenthyl acetate 0.51
28 26.449 β-Cubebene 0.05 23.157 trans-carane 0.18  
29 26.586 β- Elemene 0.12 26.278 β-Bourbonene 0.21
30 27.615 trans-Caryophyllene 2.76 26.586 β-Elemene 0.06
31 27.958 Calarene 0.04 27.615 trans-Caryophyllene 0.79
32 28.438 α-Humulene 0.19 28.524 trans-β-Farnesene 0.18
33 28.524 trans-β-Farnesene 0.57 29.073 Germacrene-D 0.82
34 29.073 Germacrene-D 1.41 29.33 Bicyclogermacrene 0.15
35 29.33 Bicyclogermacrene 0.33 29.775 δ-Cadinene 0.03
36 29.775 δ-Cadinene 0.10 30.701 Caryophyllene oxide 0.05
37 30.016 α-Muurolene 0.03 30.861 Viridiflorol 0.23
38 30.701 Caryophyllene oxide 0.04 32.736 Eicosane 0.36
39 30.776 Hexadecane 0.03 33.456 Di-isobutyl phthalate 0.01
40 30.861 Viridiflorol 0.15
41 33.456 Di-isobutyl phthalate 0.01
42 iso-menthone a a a 2.98 7.99 4.63
  1. aThe starred components (iso-amyl isovalerat and iso-menthone) were not found in the addressed studies