From: Alkali delignification and Bacillus sp. BMP01 hydrolysis of rice straw for enhancing biofuel yields
Assignment of bands | Related structure | Adsorption band of raw RS | Adsorption band appeared or disappeared due to NaOH pretreatment of rice straw | ||||
---|---|---|---|---|---|---|---|
1% | 3% | 5% | 7% | 10% | |||
O–H stretching | Lignin | 3409.26 | 3409.97 | 3410.31 | 3429.48 | 3425.09 | 3407.36 |
C–H stretching | Lignin | 2854.95 | 2852.00 | 2854.95 | 2849.06 | ||
C≡C stretching | aromatic rings | 2360.43 | 2360.43 | 2363.37 | 2366.31 | ||
C≡C stretching | aromatic rings | 2330.99 | 2336.88 | 2339.82 | 2333.93 | ||
Carbonyl stretching conjugate with aromatic rings | Cellulose | 1639.25 | 1621.59 | 1636.30 | 1648.08 | ||
Aromatic C–O stretch | Lignin | 1505.84 | |||||
C–O stretching | Cellulose | 1405.19 | 1406.11 | 1405.18 | 1405.50 | 1406.34 | |
C–H symmetric and asymmetric deformation | Cellulose | 1380.21 | 1383.16 | 1383.16 | 1380.21 | 1380.21 | |
C–O stretching | Cellulose | 1333.12 | 1333.12 | 1330.17 | 1336.06 | 1336.06 | |
Acetylated hemicellulos | Hemicellulose | 1256.58 | 1262.47 | 1268.16 | 1265.41 | 1265.41 | |
Weak C–O stretching | Cellulose | 1206.54 | 1200.65 | 1203.06 | |||
Glycosidic linkage | Hemicellulose | 1197.71 | 1197.71 | ||||
C–O stretching | Cellulose hemicellulose | 832.71 | 835.65 | 835.65 | 841.54 | ||
C–H bending | Hemicellulose | 770.89 | 709.08 | 712.02 | |||
C–C stretching | Hemicellulose | 467.70 | 470.65 | 520.69 |