Table 1 Frequency (cm-1) assignment, proposed vibrational mode and molecular source of 6 prominent significant wavenumbers.
From: Evaluation of FTIR Spectroscopy as a diagnostic tool for lung cancer using sputum
Peak | Peak position from second derivative (cm-1) | Proposed vibrational mode | Proposed primary source | |
|---|---|---|---|---|
| Â | normal | cancer | Â | Â |
A | 964 | 966 | PO4 = stretch; C-C stretch | Protein and nucleic acid |
B | 1024 | 1024 | C-O stretch, C-O bend | Glycogen |
C | 1049 | 1051 | C-O stretch, C-O bend | Glycogen |
D* | 1411 | 1417 | COO- stretch, C-H bend | Protein |
E | 1577 | 1577 | Amide II, NH bend, C-N stretch, C = N imidazole ring stretching | Protein and nucleic acid |
F | 1656 | 1654 | Amide I, C = O stretch | Protein |