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| Description | Expected peak position (cm−1) | Observed peak position (cm−1) |
|---|---|---|
| Stretching of CH alkane chain | 2640–3000 | 2949 |
| Free carboxylic acid | 1743 | 1739 |
| CH2 bending | 1465 | 1458 |
| CH3 bending | 1375 | 1361 |
| Amide-I bond | 1600–1700 | 1657 |
| Amide-II bond | 1510–1580 | 1550 |
| C–N stretch | 1020–1250 | 1097 |
| Amide A, N–H stretch | 3225–3280 | 3288 |
