Table 2.
Lignocellulosic composition, CrI, and recovery of untreated and pretreated rice straw
| Pretreatment | Composition (%) | Delignification (%) | CrI (%) | Biomass recovery (%) | Sugar yield (%) | Theoretical yield of ethanola (%) | ||
|---|---|---|---|---|---|---|---|---|
| Hemicellulose | Cellulose | Lingin | ||||||
| Untreated | 35.49 ± 0.73 | 22.87 ± 1.55 | 19.91 ± 1.56 | 0 | 67.6 | 100.0 | 31.5 ± 1.8 | 16.1 |
| ILM | 38.31 ± 1.21 | 26.30 ± 0.99 | 13.14 ± 0.25 | 38.4 | 62.3 | 93.4 ± 2.5 | 38.6 ± 1.3 | 19.7 |
| ILM | 39.56 ± 0.37 | 30.54 ± 1.30 | 12.35 ± 0.45 | 42.7 | 60.9 | 92.3 ± 0.8 | 46.8 ± 2.4 | 23.9 |
| UHP | 38.66 ± 0.97 | 28.64 ± 0.73 | 16.68 ± 0.56 | 21.6 | 56.3 | 93.6 ± 1.0 | 62.5 ± 2.4 | 31.9 |
| UHP | 38.83 ± 0.36 | 32.57 ± 1.22 | 16.03 ± 0.60 | 25.6 | 53.4 | 92.4 ± 0.2 | 50.4 ± 3.2 | 25.7 |
| UHP | 40.50 ± 0.24 | 35.55 ± 0.54 | 15.49 ± 0.20 | 29.6 | 48.3 | 90.5 ± 1.4 | 74.9 ± 2.8 | 38.2 |
| ILM + UHP | 40.46 ± 1.23 | 30.23 ± 0.33 | 10.36 ± 0.15 | 57.3 | 47.9 | 82.0 ± 0.5 | 71.0 ± 2.6 | 36.2 |
| ILM + UHP | 42.92 ± 1.30 | 33.14 ± 0.49 | 11.63 ± 0.46 | 50.0 | 46.3 | 85.6 ± 1.9 | 75.3 ± 2.0 | 38.4 |
| ILM + UHP | 43.30 ± 0.89 | 37.16 ± 1.36 | 8.40 ± 0.38 | 66.2 | 42.4 | 80.1 ± 1.5 | 89.6 ± 3.1 | 45.7 |
aMaximum theoretical yield for ethanol from hexose as well as pentose sugars is 0.51 g/g sugar (Singh et al. 2014)