| Peak position (cm−1) | Vibrational mode | Proposed primary source | |
| Leukoplakia tissue | Cancer/normal tissue | ||
| 1024 | 1030 | C-O streching, C-O bending | glycogen |
| 1238 | 1238 | PO2-stretching | nucleic acid |
| 1388 | 1388/1390 | CH2 bending | protein |
| 1454 | 1451 | CH2 bending | protein |
| 1535 | 1535 | amide II: CN-H, C-N | protein |
| 1650 | 1650 | amide I: C=O streching | protein |