| 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 | - | - |
| 2953, 2922, 2852 | 2335.38 | 2953,2922, 2852 | 2197.72 | -C-H (CH3), -C-H (CH2) | Asymmetric and symmetrical axial deformation |
| 1749 | 30.92 | 1741 | 482.69 | -C=O | Axial deformation |
| 1670 | 2.94 | Absent | - | C=C (trans) | Axial deformation |
| 1652 | 11.00 | Absent | - | C=C (cis) | Axial deformation |
| 1458 | 323.86 | 1462 | 409.14 | -C-H (CH2) | Symmetrical angular deformation |
| 1417 | 2.72 | Absent | - | =C-H (cis) | Angular deformation |
| 1396 | 3.10 | Absent | - | =C-H (cis) | Angular deformation |
| 1377 | 102.60 | 1377 | 351.89 | -C-H (CH3) | Symmetrical angular deformation |
| Ausente | - | 1228, 1217, 1207 | 218.29 | C-O | Axial deformation |
| 1157 | 50.52 | 1157 | 19.91 | C-O | Axial deformation |
| 721 | 74.17 | 721 | 68.12 | -(CH2)n- | Asymmetric angular deformation |