In addition to the acid concentration, the solids content in the
slurry is a crucial parameter for the pretreatment of the hemicelluloses,
which is directly related to the sugar yields that are obtained
[38]. In this study, different solids content in the slurry were evaluated
at 15%, 20%, 25%, 30% and 35% w/v, and the results are shown
in Fig. 2A and B.