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38 Lignocellulosic Biomass to Liquid Biofuels
models are shown in Fig. 2.4 [68]. The removal of lignin can well
increase the accessibility of cellulose. It has been found that the improve-
ment of enzymatic hydrolysis of sugarcane bagasse by PAA is mainly due
to the delignification and an increase in the surface area with exposure of
cellulose fibers [102]. However, because of the partial removal of lignin
and hemicelluloses, the crystallinity increased after PAA pretreatment, but
it seemed not to significantly impact cellulose digestibility [68].
Figure 2.4 Main reactions of peracetic acid oxidation of lignin-related structures by
1
HO . Adapted from X. Zhao, K. Cheng, D. Liu, Organosolv pretreatment of lignocellulosic
biomass for enzymatic hydrolysis, Appl. Microbiol. Biotechnol. 82 (2009) 815 827 [68].
