Table 2. Peak positions of main Raman bands in the Raman active components (Refs. 2, 9, 19, 31, 33, 38).
| Raman peaks [cm−1] |
Band assignments | Components |
|---|---|---|
| 835 | DNA backbone: O-P-O/ tyrosine | nucleus |
| 855 | CCH bending (aromatic) of protein | elastin, keratin |
| 856 | C-C vibration of the collagen backbone | collagen |
| 937 | C-C stretching of proline and valine and protein backbone | keratin |
| 940 | C-C stretching of protein backbone | collagen, elastin |
| 1003 | C-C vibration of phenyl ring | collagen, elastin, keratin |
| 1063 | C-C asymmetric skeletal stretching of lipids (trans-conformation); | ceramide |
| 1080 | C-C skeletal stretching | triolein |
| 1093 | O-P-O symmetric stretching vibration of the DNA backbone | nucleus |
| 1128 | C-C symmetric skeletal stretching | ceramide |
| 1248 | Amide III (β-sheet and random coil conformations) | collagen, elastin |
| 1254 | β sheet/ thymine/ cytosine (DNA base/ DNA & RNA base) | nucleus |
| 1269 | Amide III (α-helix conformation), C-N stretching, N-H in-plane bending | collagen, elastin, keratin |
| 1301 | C-H modes (CH2 twisting and wagging) of lipids; CH2/CH3 bands | triolein |
| 1336 | desmosine/isodesmosine | elastin |
| 1337 | adenine, guanine (DNA & RNA base) | nucleus |
| 1378 | linear stretching of the C-C bonds within the rings | melanin |
| 1440 | CH2/CH3 bands | triolein, ceramide |
| 1450 | C-H bending of proteins | keratin |
| 1454 | C-H stretching, C-H asymmetric deformation | collagen, elastin |
| 1573 | in-plane stretching of the aromatic rings | melanin |
| 1645 | O-H bending mode of liquid water | water |
| 1653 | C-O stretching model of amide I | keratin |
| 1656 | C-C lipids | triolein |
| 1665 | C-O amide I vibration | collagen, elastin |