TABLE 3.
Structure attribution and relative strength of absorption peaks in IR spectra (Kim and Lee, 2005).
| Wave number/cm−1 | Response peak | Pretreatment methods | ||
|---|---|---|---|---|
| Raw material | Pretreated by LHW | Pretreated by MA-LHW | ||
| 3,600–3,000 | O-H stretching vibration | 2.366 | 2.234 | 2.211 |
| 2,900 | C-H stretching vibration | 1.750 | 1.527 | 1.465 |
| 1,432 | Cellulose CH2 bending vibration and shear vibration | 0.757 | 1.006 | 1.099 |
| 1,730 | Hemicellulose C=O stretching vibration | 0.919 | 0.285 | 0.174 |
| 1,372 | Cellulose and hemicellulose-CH bending vibration | 1.000 | 1.000 | 1.000 |
| 1,163 | Cellulose and hemicellulose C-O-C stretching vibration | 1.577 | 1.578 | 1.429 |
| 898 | β-glucoside bond vibration | 1.197 | 0.668 | 0.504 |