Table 1.
Position and assignment of typical IR bands of REVs.
| Wavenumber (cm−1) | Vibrational mode | Assigment |
|---|---|---|
| 3288 | N–H stretching (amide A) overlapped with –OH stretching | Proteins |
| 2955 | CH3 antisymmetric stretching | Lipids and proteins, carbohydrates |
| 2923 | CH2 antisymmetric | Lipids and side chains of proteins |
| 2850 | CH2 symmetric stretching | Lipids and side chains of proteins |
| 1734 | C=O stretching | Phospholipids, triglycerides, cholesterol esters |
| 1654 | C=O stretching (amide I) | Proteins |
| 1542 | N–H deformation with C–N stretching (amide II) | Proteins |
| 1459 | CH2 deformation | Lipids |
| 1395 | CH3 deformation | Lipids and side chains of proteins, carbohydrates |
|
1299 1238 |
PO2- antisymmetric stretching and C–N stretching (amide III) | Lipids and proteins |