Table 6.
Assignment of FTIR frequencies of H. revolutum subsp. keniense essential oils.
| Peak number | Frequency peak value of H. revolutum subsp. keniense essential oils | Assignment of the functional group | |
|---|---|---|---|
| HRLEO | HRFEO | ||
| 1 | 3749.4 | Not detected | O-H stretch |
| 2 | 3315.5–3160.2 | 3417–3255.6 | O-H stretch |
| 3 | 2923 | 2923 | A symmetric stretching of –CH (CH2) vibration |
| 4 | 2862.2 | 2862.2 | Symmetric stretching of –CH (CH2) vibration |
| 5 | 2731.8 | Not detected | O-H stretch |
| 6 | 2376.1–2113.8 | 2376.1–2275.8 | C-H bend |
| 7 | 1635.5 | 1643.2 | C=C, stretch |
| 8 | 1558.4 | 1566.1 | Carboxylate |
| 9 | 1450.4 | 1450.4 | C-H bend |
| 10 | 1380.9 | 1380.9 | O-H bend, alcoholic group |
| 11 | 1257.5 | 1257.5 | CN, aromatic primary amine |
| 12 | 1180.4 | 1180.4 | C-O |
| 13 | 1103.2 | 1110.9 | CH3 |
| 14 | 987.5 | 987.5 | C-H Alkene |
| 15 | 887.2 | 887.2 | C-H |
| 16 | 748.3 | 740.6 | -(CH2) n |