| Wave number (cm−1) | Functional Group Assignments |
| 3500 - 3700 | O-H stretching vibration of hydroxyl groups (mainly lipids and proteins) |
| 3380 | O-H stretching, Amine (N-H stretching vibration) mainly carbohydrates proteins |
| 2957 | CH3 asym stretching (mainly lipids) |
| 2922 | CH2 asym stretching (mainly lipids) |
| 2873 | CH3 sym stretching (mainly proteins) |
| 2852 | CH2 sym stretching (mainly lipids) |
| 1710, 1733 | C=O carbonyl stretching of saturated aliphatic esters |
| 1630 | Amide I (protein C=O stretch) |
| 1555 | Amide II (C-N, N-H stretching) mainly proteins |
| 1415 | O-H bending, polysaccarides |
| 1377 | Symmetric bending of aliphatic CH3, triterpene compounds (CH2=CH-CH3) |
| 1250 | Pectic substances |
| 1235 | Amide III (C-N, N-H stretching) mainly proteins |
| 1145 | Cellulose (b-glucan), triterpene compounds (C-O) |
| 1101 | Antisym in-phase, pectic substances |
| 1073 | Rhamnogalactorunan, b-galactan |
| 1064 | C-O stretching , cell wall polysaccharides (glucomannan) |
| 1035 | OH and C-OH stretching in sugars, cell wall polysaccharides (arabinan) |