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Peak assignment in the spectrum.
| Wavelength (cm−1) | 1036.2 to 1442.5 | 1555.5 to 1636.3 | 2922.6 to 3338.7 |
| Transmittance0 | 44.962 to 76.401 | 63.439 to 66.145 | 74.179 to 53.157 |
| Functional group | Bending vibration of | C-H for sp3 carbon, | Presence of O-H of carboxylic acid and C-H |
| O-Ca-O group. | C=O for sp2 carbon | ||
| Presence of sp2 in aldehyde/ketone and ester | N-H bond |
