Online Resource 4. Gas chromatography–mass spectrometry (GC-MS) analyses of the essential
oils used in this study. Only those components which were >1% of the largest peak are listed for
each oil. In each of the tables below, compounds in bold-face type were confirmed by matching
their retention times and mass spectra with those of authentic standards, compounds in italics
were identified in previous studies, listed, and compounds shown in normal font (i.e., no
formatting) were tentatively identified only by matches with the NIST mass spectral database,
with the match quality shown.
Table 1. Gas chromatography–mass spectrometry (GC-MS) analysis of bitter orange oil.
Compound
Myrcene
Limonene
% of largest peak
1.6
100
MS database match quality (%)
n/a
n/a
Table 2. Gas chromatography–mass spectrometry (GC-MS) analysis of cedarwood oil.
Compounds in italics were identified in Eller and King (2000).
Compound
α-Cedrene
β-Cedrene
cis-thujopsene
Unknown sesquiterpene
α-longipinene
β-chamigrene
Unknown sesquiterpene
α-chamigrene
Cuparene
Unknown
β-curcumene
Cedrol
% of largest peak
100
24.1
97.5
1.7
1.6
6.1
14.1
5.1
7.2
2.3
4.9
92.6
MS database match quality (%)
98
95
99
89
98
96
98
81
97
Table 3. Gas chromatography–mass spectrometry (GC-MS) analysis of cinnamon (cassia) oil.
Compounds in italics were identified in Ranger et al. (2013).
Compound
Benzaldehyde
Cinnamaldehyde
Cinnamyl acetate
2-methoxycinnamaldehyde
% of largest peak
1.5
100
4.7
9.2
MS database match quality (%)
n/a
97
97
98
Table 4. Gas chromatography–mass spectrometry (GC-MS) analysis of clove bud oil.
Compounds in italics were identified in Ranger et al. (2013).
Compound
Eugenol
-Caryophyllene
Humulene
Eugenol acetate
% of largest peak
100
10.2
1.2
21.7
MS database match quality (%)
98
n/a
n/a
98
Table 5. Gas chromatography–mass spectrometry (GC-MS) analysis of eucalyptus oil.
Compound
α-pinene
p-cymene
Eucalyptol & limonene (~5%)
γ-terpinene
α-terpineol
% of largest peak
3.0
4.6
100
2.4
1.6
MS database match quality (%)
n/a
n/a
n/a
n/a
n/a
Table 6. Gas chromatography–mass spectrometry (GC-MS) analysis of garlic oil. Compounds in
italics were identified in Li et al. (2014) and Mnayer et al. (2014).
Compound
% of largest peak
MS database match quality (%)
Diallyl sulfide
29.1
96
Allyl methyl disulfide
6.4
Not in database; m/z 120
Diallyl disulfide
100
45**
Allyl methyl trisulfide
5.6
Not in database; m/z 152
Unknown
5.3
m/z 138
Unknown
2.5
m/z 136
Diallyl trisulfide
68.9
64**; m/z 188
Unknown
4.7
m/z 170
Diallyl tetrasulfide
29.2
93
** From visual examination of spectrum, match quality was much higher than predicted by the
search algorithm
Table 7. Gas chromatography–mass spectrometry (GC-MS) analysis of lemongrass oil.
Compounds in italics were identified in Vazirian et al. (2012).
Compound
Camphene
6-Methyl-5-hepten-2-one
Limonene
4-Nonanone
Linalool
Isoborneol
Unknown
Neral
Geraniol
Geranial
Geranyl acetate
-Caryophyllene
-cadinene
-cadinene
% of largest peak
2.6
4.5
1.9
2.3
3.0
2.0
2.0
71.9
9.9
100
10
5.9
3.9
2.1
MS database match quality (%)
n/a
n/a
n/a
94
n/a
n/a
m/z 152
95
94
94
91
n/a
97
96
Table 8. Gas chromatography–mass spectrometry (GC-MS) analysis of peppermint oil.
Compounds in italics were identified in Ranger et al. (2013).
Compound
-Pinene
Unknown monoterpene
-Pinene
Limonene
Eucalyptol
-terpinene
Trans--terpineol
Menthone
Menthofuran +
Unknown
Menthol
Terpinen-4-ol
Unknown
Pulegone
Menthyl acetate
-Caryophyllene
-copaene
% of largest peak
1.5
1.0
2.0
3.0
13.9
1.3
2.2
57.2
23.5
100
3.2
2.1
3.9
11.4
5.2
2.6
MS database match quality (%)
n/a
n/a
n/a
n/a
n/a
96
n/a
90
m/z 154
91
n/a
95
91
n/a
94
Table 9. Gas chromatography–mass spectrometry (GC-MS) analysis of white pine (Pinus
strobus) oil.
Compound
% of largest peak
MS database match quality (%)
1.8
n/a
Limonene
5.8
n/a
4-Carene
Fenchol
4.6
98
1-Terpineol
4.7
50**
6.3
97
-Terpineol
Isoborneol
1.3
95
p-Menth-8-en-1-ol stereoisomer
2.4
95
Endoborneol
5.6
97
2.3
n/a
Terpinen-4-ol
100
n/a
-Terpineol
15.0
96
-Terpineol
Unknown
6.4
** From visual examination of spectrum, match quality was much higher than predicted by the
search algorithm
Table 10. Gas chromatography–mass spectrometry (GC-MS) analysis of rosemary oil.
Compounds in italics were identified in Ranger et al. (2013).
Compound
α-Pinene
Camphene
β-pinene
Myrcene
p-Cymene
Eucalyptol
γ-Terpinene
Linalool
Camphor
Endoborneol
Terpinen-4-ol
α-Terpineol
Isobornyl acetate
-Caryophyllene
% of largest peak
21.7
8.7
15.9
2.0
3.6
100
1.3
1.3
19.8
5.2
1.5
3.2
2.2
7.9
MS database match quality (%)
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
98
97
n/a
n/a
98
n/a
Table 11. Gas chromatography–mass spectrometry (GC-MS) analysis of spearmint oil.
Compounds in italics were identified in Jalali-Heravi et al. (2014).
Compound
β-pinene
Myrcene
3-octanol
Limonene
Eucalyptol
-Terpineol
Terpinen-4-ol
Dihydrocarvone
Carvone
β-Bourbonene
Caryophyllene
% of largest peak
1.1
2.6
1.1
19.1
3.4
1.2
1.7
1.8
100
3.3
2.1
MS database match quality (%)
n/a
n/a
83
n/a
n/a
96
n/a
99
96
96
n/a