| Sample “in natura” | Sample after sun exposure | Organic group | Vibration mode | ||
| Wave number cm−1 | Band area cm2 | Wave number cm−1 | Band area cm2 | - | - |
| 3008 | 51.01 | 3008 | 72.09 | =C-H (cis) | Axial deformation |
| 2922, 2852 | 1599.81 | 2922,2852 | 1518.66 | -C-H (CH2) | Asymmetric and symmetrical axial deformation |
| 1743 | 721.82 | 1743 | 1344.08 | -C=O | Axial deformation |
| 1670 | 1.58 | Absent | - | C=C (trans) | Axial deformation |
| 1652 | 7.90 | Absent | - | C=C (cis) | Axial deformation |
| 1463 | 233.74 | 1462 | 311.73 | -C-H (CH2) | Symmetrical angular deformation |
| 1417 | 7.27 | Absent | - | =C-H (cis) | Angular deformation |
| 1396 | 6.62 | Absent | - | =C-H (cis) | Angular deformation |
| 1375 | 79.28 | 1375 | 339.59 | -C-H (CH3) | Symmetrical angular deformation |
| 1236 | 76.62 | 1228, 1217, 1205 | 221.04 | C-O | Axial deformation |
| 1159 | 479.20 | 1159 | 316.89 | C-O | Axial deformation |
| 721 | 692.22 | 721 | 693.97 | -(CH2)n- | Asymmetric angular deformation |