Table 3.
Volatile compounds (relative percentage in the volatile fraction) detected in Harpagophytum procumbens root extract (HPE) dissolved in DMSO (HPEDMSO), 100% v/v EtOH (HPEEtOH100), 50% v/v EtOH (HPEEtOH50), and deionized water (HPEH2O).
| No. 1 | Compound 2 | LRI 3 | LRI 4 | MS 5 | HPEDMSO (%) |
HPEEtOH100 (%) |
HPEEtOH50 (%) |
HPEH2O (%) |
|---|---|---|---|---|---|---|---|---|
| 1 | β-pinene | 978 | 974 | + | - | - | 5.1 | - |
| 2 | thymol | 1308 | 1310 | + | 0.8 | - | - | - |
| 3 | eugenol | 1339 | 1344 | + | 6.0 | 14.6 | 51.6 | - |
| 4 | α-copaene | 1381 | 1387 | + | - | 6.3 | 3.7 | - |
| 5 | β-caryophyllene | 1412 | 1416 | + | 77.4 | 77.1 | 38.6 | - |
| 6 | isoeugenol | 1432 | 1439 | + | - | - | 1.0 | - |
| 7 | α-humulene | 1450 | 1454 | + | 10.0 | 0.8 | - | - |
| 8 | δ-cadinene | 1528 | 1530+ | + | 5.8 | 1.3 | - | - |
| Total (%) | 100.0 | 100.0 | 100.0 |
1 Compound identification number; 2 compounds are reported according their elution order on column; 3 linear retention indices measured on apolar columns; 4 linear retention indices from literature; + normal alkane RI; 5 identification by MS spectra, tr < 0.1%.