Table 1 Chemical composition of sugarcane bagasse before and after alkaline-sulfite pretreatment, and glucurono-arabinoxylans (GAX) extracted from the pretreated material
From: Xylan extraction from pretreated sugarcane bagasse using alkaline and enzymatic approaches
Components (g/100 g of sample on dry basis) | Untreated bagasse
| Unwashed pretreated bagasse
| Alkaline-extracted GAX (Hoije method)
| Alkaline-extracted GAX (Lopez method)
| Enzymatically extracted GAX
|
|---|---|---|---|---|---|
Total lignin | 21.1 ± 0.4 | 13.6 ± 0.2 | 8.4 ± 0.1 | 10.2 ± 0.2 | < 4 |
Glucan | 40.4 ± 0.2 | 45.2 ± 0.3 | 5.23 ± 0.1 | 4.4 ± 0.1 | 2.2 ± 0.1 |
Xylan | 22.4 ± 0.3 | 23.2 ± 0.3 | 61.7 ± 0.8 | 64.2 ± 0.2 | 72.5 ± 0.1 |
Arabinosyl groups | 2.6 ± 0.1 | 2.8 ± 0.1 | 7.7 ± 0.1 | 6.8 ± 0.1 | 11.5 ± 0.8 |
Uronic acid groups | 2.5 ± 0.2 | 2.4 ± 0.4 | 6.5 ± 0.1 | 5.7 ± 0.1 | 13.3 ± 0.8 |
Acetyl groups | 3.3 ± 0.9 | 0.2 ± 0.0 | nd | nd | nd |
Extractives | 4.5 ± 0.5 | 5.4 ± 0.1 | na | na | na |
