Table 2. Tentative assignments for the major Raman bands in colon tissue [23–29].
| Raman band, cm−1 | Vibration mode | Molecular Assignment |
|---|---|---|
| 720 | Choline (RN+(CH3)3) stretching | Phosphatidylcholine |
| 750 | Ring breathing | Tryptophan, DNA |
| 830, 853 | Tyrosine ring breathing | Protein |
| 875 | C-C symmetric stretching | Protein and lipids |
| 875, 877 | Choline group stretching | Phosphatidylcholine |
| 1003 | Phenylalanine ring breathing | Phenylalanine |
| 1068, 1128 | Trans C-C stretching | Backbone of lipid, protein, carbohydrate |
| 1080 | PO2- group in DNA and lipids | DNA, phospholipids |
| 1086 | gauche C-C stretching | Backbone of lipid, protein, carbohydrate |
| 1230-1285 | Amide III | Protein |
| 1270 | = C-H deformation | Lipids |
| 1303 | CH2 twisting | Lipids |
| 1342 | CH deformation | Protein |
| 1447 | CH2 scissoring | Lipid and protein |
| 1600-1700 | Amide I α-helix | Protein |
| 1655 | Cis -C = C- stretching | Lipid |
| 1735 | Ester carbonyl stretching | Lipid |