As for cellulose, this polysaccharide was hardly affected by hydrothermal pretreatments so that in all LHW experiments the cellulose recovery was close to 100% (99.5% average), Fig. 2B. Therefore, the solubilisation of the hemicellulosic fraction in LHW assays led to the increase of the cellulose percentage in the pretreated solids from 27.9% to 43.0% when increasing temperature from 190 C to 230 C. For DSA pretreatments, the cellulose recovery remained almost constant (94.3%, 93.8% and 91.4%) until temperature reached 210 C, but beyond this value the cellulose yield decreased with temperature (80.3% and 45.5% for pretreatments carried out at 220 C and 230 C, respectively), Fig. 2B. The minimum percentages of cellulose in DSA pretreated solids were thereby obtained at 220 C (41.0%) and 230 C (26.6%). These
results show the higher capacity of LHW pretreatment, in comparison
to DSA hydrolysis, for removing hemicelluloses without
degrading cellulose.
As for cellulose, this polysaccharide was hardly affected by hydrothermal pretreatments so that in all LHW experiments the cellulose recovery was close to 100% (99.5% average), Fig. 2B. Therefore, the solubilisation of the hemicellulosic fraction in LHW assays led to the increase of the cellulose percentage in the pretreated solids from 27.9% to 43.0% when increasing temperature from 190 C to 230 C. For DSA pretreatments, the cellulose recovery remained almost constant (94.3%, 93.8% and 91.4%) until temperature reached 210 C, but beyond this value the cellulose yield decreased with temperature (80.3% and 45.5% for pretreatments carried out at 220 C and 230 C, respectively), Fig. 2B. The minimum percentages of cellulose in DSA pretreated solids were thereby obtained at 220 C (41.0%) and 230 C (26.6%). Theseresults show the higher capacity of LHW pretreatment, in comparisonto DSA hydrolysis, for removing hemicelluloses withoutdegrading cellulose.
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