Table 3.
FTIR analysis of banana pseudostem and their shift difference of alkaline-treated, bleached fibers and microcrystalline cellulose
| Peak no | Wavelength assignment | Banana pseudostem fibers | Alkaline treated fibers | Bleached fibers | Microcrystalline cellulose |
|---|---|---|---|---|---|
| 1 | O–H…O intermolecular stretching | 3418.19 | + 0.39 | + 0.23 | + 0.40 |
| 2 | C–H stretching | 2919.96 | − 1.15 | + 2.22 | − 20.05 |
| 3 | C=O stretching | 1608.44 | + 33.05 | + 35.67 | + 42.93 |
| 4 | C=C aromatic skeletal vibration in lignin | 1507.19 | – | – | – |
| 5 | CH2 deformation | 1425.79 | + 3.76 | + 3.71 | + 5.1 |
| 6 | CH3 deformation in lignin | 1384.41 | − 11.64 | − 12.07 | − 10.08 |
| 7 | C–O stretch in lignin and C–O linkage in guaiacyl aromatic group | 1260.14 | – | – | – |
| 8 | C–O–C vibration in cellulose and hemicellulose | 1160.31 | + 2.23 | + 2.25 | − 0.13 |
| 9 | C–O stretching in cellulose and hemicellulose | 1037.83 | + 22.83 | + 22.49 | + 22.49 |
| 10 | C–H deformation in cellulose | 897.50 | + 0.29 | + 0.29 | + 0.26 |
Shift difference (shift increase +, shift decrease/remove −) in the respective wavelength peak of banana pseudostem fiber compared to alkaline-treated fibers, bleached fiber and microcrystalline cellulose