From: Structural evaluation of sugar cane bagasse steam pretreated in the presence of CO2 and SO2
Assignment of FT-IR absorption of sugar cane bagasse | Relative absorbance of different groups in bagasse samples | |||
---|---|---|---|---|
Maximum band position (cm-1) | Untreated bagasse | Pretreated bagasse with SO2 | Pretreated bagasse with CO2 | |
O-H stretching (H-bonded) | 3386 | 0.30 | 0.51 | 0.50 |
O-H vibration of phenolic group | 1375 | 0.79 | 0.93 | 0.90 |
O-H stretching of secondary alcohol | 1165 | 0.51 | 0.71 | 0.65 |
O-H stretching of primary alcohol | 1051 | 0.29 | 0.61 | 0.57 |
C-O-C stretching | 1110 | 0.40 | 0.65 | 0.58 |
C-O stretching of phenols | 1250 | 0.69 | 0.95 | 0.89 |
C-H aliphatic axial deformation | 2920 | 0.71 | 0.78 | 0.78 |
C-H aliphatic angular deformation | 1427 | 0.85 | 0.94 | 0.91 |
C-H vibration of methoxyl group | 2852 | 0.85 | 0.87 | 0.89 |
C-H angular deformation of methoxyl group | 1462 | 0.88 | 0.95 | 0.93 |
C-Ph vibration | 1604 | 0.88 | 0.97 | 0.94 |
C=C aromatic skeletal vibration | 1633 | 0.89 | 0.99 | 0.98 |
β-glycisidic linkages | 897 | 1.14 | 1.24 | 1.19 |
C=O stretching | 1735 | 1.03 | 1.19 | 1.24 |