Components % (w/v) Untretated material Pretreated material
Bagasse Straw Bagasse Straw Bagasse-straw 1:1 mixture
Cellulose 39.99 ± 3.50 29.39 ± 8.20 48.97 ± 3.28 36.34 ± 3.44 42.66 ± 3.16
Hemicellulose 21.82 ± 4.43 31.38 ± 2.88 4.37 ± 0.42 2.62 ± 0.50  4.41 ± 0.42
Lignin 26.51 ± 1.45 26.00 ± 0.60 32.05 ± 0.53 30.76 ± 2.89 33.34 ± 2.95
Ashes 1.40 ± 0.04 4.83 ± 0.10 2.57 ± 0.50 6.28 ± 0.01 4.64 ± 0.60
Extractives*/others 7.41 ± 0.71 12.65 ± 0.09 9.94 ± 5.8 18,54 ± 4.81 8.37 ± 0.30
Total 97.14 ± 8.30 104.24 ± 6.97 97.90 ± 3.41 94.54 ± 6.81 100.20 ± 6.03
*The extractives content of the pretreated materials was estimated based on mass balance after pretreatment. The untreated straw extractives content, of 12.60%, was determined after washing the material. The straw used in the pretreatment was not washed and presented 17.55 ± 0.53 extractives content
Table 1: Chemical composition of sugarcane bagasse and straw and the bagasse-straw 1:1 mixture before and after hydrothermal pretreatment.