Table 8 Summary of FTIR spectral features for tested polymers.
Sample | Key FTIR peaks (cm⁻¹) | Assigned functional groups | Interpretation |
|---|---|---|---|
BSG | 3400–3600, 2930, 1650, 1400 | O–H stretching, C–H stretching, COO⁻ symmetric/asymmetric | Indicates presence of polysaccharide backbone and uronic acids |
XGU | 3200–3400, 2910, 1610, ~ 1040 | O–H stretching, COO⁻, C–O–C stretching | Polysaccharide with glycosidic linkages; similar to BSG |
GGU | 3200–3400, 2920, 1610, 1020 | O–H stretching, C = O, C–O (glycosidic) | Galactomannan structure with glycosidic and carboxylic groups |
HPAM | 3200–3400, 1650, 1450 | Amide I (C = O), Amide II (N–H bend), C–N stretch | Synthetic polymer with amide functional groups |
