Table 2.
FTIR bands and their assignments for CG, PAM, HCG and HCGP.
| Sample | Wave Number (cm−1) | Functional Group/Chemical Bond |
|---|---|---|
| HCG | 3382 | Stretching O–H bond in hydroxyl groups |
| 2935 and 2890 | C–H stretching | |
| 1642 and 1375 | Deformation O–H bond and flexion C-H bond | |
| 1158, 1080 and 1038 | C–O–C glycosidic bonds and O–H bending from alcohols | |
| PAM | 3401 and 3193 | Axial deformation vibrations in N–H bond |
| 1670 and 1610 | C=O stretching vibration in amide and N–H stretching vibration in amide | |
| 1450, 1414, and 1102 | –CH2 scissoring, CN and N–H stretching vibrations | |
| HCG and HCGP | 3600–3000 | Overlap of the N–H and O–H stretching vibration |
| 1669 | C=O stretching | |
| 1564 and 1566 | N–H stretching vibration in amide group | |
| 885 | Out-of-plane C–H bending vibrations |