TABLE 1.
Secondary metabolites of fresh and dry key lime’s essential oils are identified by GC-MS analysis.
| Compound name | a Kovats index (RI) calculated | b Kovats index (RI) | Area% fresh | Area% dry | Identification |
|---|---|---|---|---|---|
| Monoterpene hydrocarbon | |||||
| α-Thujene | 923 | 927 | 0.15 | 0.26 | RI, MS |
| α-Pinene | 929 | 939 | 2.79 | 1.79 | RI, MS |
| Camphene | 943 | 940 | 0.65 | 0.07 | RI, MS |
| β-Pinene | 971 | 981 | 10.88 | 1.33 | RI, MS |
| β-Myrcene | 988 | 993 | 1.65 | 2.27 | RI, MS |
| D-Limonene | 1031 | 1035 | 42.02 | 72.64 | RI, MS |
| α-Phellandrene | 1001 | 1003 | 0.49 | 0.22 | RI, MS |
| α- Terpinene | 1013 | 1017 | -- | 0.55 | RI, MS |
| γ-Terpinene | 1057 | 1058 | 10.16 | 15.69 | RI, MS |
| α-Terpinolene | 1088 | 1090 | 4.36 | 1.35 | RI, MS |
| α -Terpinyl acetate | 1331 | 1330 | -- | 0.07 | RI, MS |
| O-Cymene | 1022 | 1027 | 2.43 | -- | RI, MS |
| Trans-β-Ocimene | 1035 | 1043 | 0.29 | -- | RI, MS |
| β -Ocimene | 1045 | 1050 | 0.55 | -- | RI, MS |
| Monoterpene hydrocarbon total % | 76.42% | 96.24% | |||
| Oxygenated monoterpene | |||||
| Linalool | 1097 | 1094 | 0.44 | 0.14 | RI, MS |
| β-Terpineol | 1141 | 1159 | 0.56 | 0.13 | RI, MS |
| 4-Terpinenol | 1174 | 1177 | 1.71 | 0.77 | RI, MS |
| α-Terpineol | 1188 | 1192 | 7.84 | 1.61 | RI, MS |
| Trans-p-mentha-1(7),8-dien-2-ol | 1185 | 1185 | -- | 0.15 | RI, MS |
| Cis-Dihydrocarvone | 1194 | 1194 | -- | 0.10 | RI, MS |
| Cis-Carveol | 1206 | 1214 | -- | 0.11 | RI, MS |
| Cis-p-mentha-1(7),8-dien-2-ol | 1226 | 1231 | -- | 0.08 | RI, MS |
| (−)-Carvone | 1242 | 1242 | -- | 0.11 | RI, MS |
| Fenchol | 1110 | 1113 | 0.7 | -- | RI, MS |
| Endo-Borneol | 1163 | 1165 | 0.78 | -- | RI, MS |
| 1-Terpinenol | 1131 | 1134 | 0.33 | -- | RI, MS |
| 8-p-Cymenol | 1184 | 1183 | 0.11 | -- | RI, MS |
| γ-Terpineol | 1195 | 1199 | 0.78 | -- | RI, MS |
| Decanal | 1202 | 1207 | 0.26 | -- | RI, MS |
| Oxygenated monoterpene total % | 13.51% | 3.2% | |||
| Sesquiterpene hydrocarbon | |||||
| Caryophyllene | 1418 | 1414 | 0.98 | 0.18 | RI, MS |
| α-Farnesene | 1504 | 1509 | 1.55 | 0.12 | RI, MS |
| Elemene | 1389 | 1382 | 0.07 | -- | RI, MS |
| Humulene | 1453 | 1455 | 0.22 | -- | RI, MS |
| β-Santalene | 1458 | 1457 | 0.66 | -- | RI, MS |
| α-Guaiene | 1494 | 1490 | 0.1 | -- | RI, MS |
| Cis-α-Bisabolene | 1499 | 1501 | 0.15 | -- | RI, MS |
| β-Bisabolene | 1506 | 1509 | 2.89 | -- | RI, MS |
| Selina-3,7(11)-diene | 1542 | 1542 | 0.12 | -- | RI, MS |
| Eudesma-4(14),11-diene | 1486 | 1486 | 0.08 | -- | RI, MS |
| Sesquiterpene hydrocarbon total % | 6.82% | 0.30% | |||
| Total percentage | 96.75% | 99.74% | |||
a
Calculated Kovats index (RI).
b
NIST, literature, and Adams Kovats index (RI). MS, mass spectral.