To understand the effects of the employed pretreatments on cellulose
structure, the cellulose CrI and DP were detected in this study
(Fig. 3). The cellulose CrI is used to determine the ratio of crystal
region to amorphous region in cellulose, which is believed to be
an important cellulose feature affecting biomass saccharification
(Himmel et al., 2007; Alvira et al., 2010; Zhang et al., 2013). In this
work, the cellulose CrI of RWSS increased significantly after fouralkali-based pretreatments and RWSS after pretreatment D achieved the highest CrI at 62.5%