Table 9.
Locations of FTIR absorption bands’ maxima registered within the spectral range of 500–3600 cm−1 and assignment of particular vibrations to the respective samples from 2019 and 2020—corresponding to data in Figure 2.
| FTIR | Type and Origin of Vibrations |
|---|---|
| Positioning of Band [cm−1] | |
| 3003 | νm(=C-H, cis-) |
| 2919 | νas, vst(-C-Hvst, -CH2) and νs, vst(-C-H, -CH2) (aliphatic groups in triglycerides) |
| 2850 | |
| 1740/1705 | νvst(-C=O) in esters / νvw(-C=O) in acids |
| 1649 | νvw(-C=C-, cis-) |
| 1457 | δvw(-C-H) in CH2 and CH3 groups, deformation (scissor)/ νvw(-C-H, cis-) deformation (wagging) |
| 1372 | νw, m, vw(-C-H, -CH3) and deformation |
| 1315 | δm(-C-H, -CH3) |
| 1270 | νm(-C-O) or δm(-CH2-) |
| 1228 | |
| 1155 | νst(-C-O) or δst(-CH2-) |
| 1137 | |
| 1091 | νm,vw(-C-O) |
| 1027 | δw(-HC=CH-, trans-) out-of-plane deformation |
| 718 | |
| 580 |
ν—stretching vibrations, δ—deformation vibrations, s—symmetric, as—asymmetric, st—strong, w—weak.