| Frequency (cm)−1 | Possible Assignment |
| 3398.56 cm−1 | OH stretching vibrations |
| 2912.09 cm−1 | The C-H stretch in alkanes |
| 2845.74 cm−1 | O-H stretch in carboxylic acid |
| 1561.06 cm−1 | C=C stretch in aromatic ring and C=O stretch in polyphenols |
| 1461.45 cm−1 | C-N stretch of amide-I in protein |
| 1018.12 cm−1 | C-O stretching in amino acid |
| 533.71 cm−1 | hexagonal phase ZnO |