Table 5.
ATR-FTIR wavenumber values (cm−1) and band assignment to functional groups.
| Wavenumber Values (cm −1) | Band Assignment | References |
|---|---|---|
| 3300–3200 | OH-stretching and NH-stretching | [56,57] |
| 3000–2800 | CH2 and CH3 of lipids | [58] |
| 1600–1700 | Amide A | [59] |
| 1690–1618 | Amide I, C-O-peptidic conformation | [56,59] |
| 1548–1530 | Amide II N-O peptidic conformation | [57] |
| 1456–1453 | -CH2 of lipids | [58] |
| 1400–1380 | CH2 and CH3 of lipids, dipicolinic acid, amide III |
[58] |
| ~1250 | CH-NH stretching | [56,57,58] |
| 1055–1050 | Phosphate groups | [56,57,58] |
| 1035–1030 | Stretching vibrations of the C–O group in esters | [60] |