Table I.
Peak positions and tentative assignments of the major Raman bands of early and advanced stage NPC tissue samples.
| Peak position, cm−1 | Vibrational mode | Major assignments |
|---|---|---|
| 853 | ν (C-C) | Pro |
| 937 | ν (C-C) in α-helix conformation | Pro and Val |
| 1004 | νs (C-C) breathing | Phe |
| 1094 | ν (C-N) | Lipids, DNA |
| 1209 | ν (C-C6H5) | Tryp and Phe |
| 1268 | δ (=C-H), δ (N-H) | PLPs, amide III |
| 1304 | δ (CH2) | Proteins and lipids |
| 1340 | (CH3CH2) wagging | Proteins and nucleic acids |
| 1450 | δ (CH2) | PLPs and collagen |
| 1660 | ν (C=C) | Lipids |
NPC, nasopharyngeal carcinoma; ν, stretching mode; νs, symmetric stretching; δ, bending mode; Pro, proline; Val, valine; Phe, phenylalanine; Tryp, tryptophan; PLPs, phospholipids.