Journal
APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
Volume 188, Issue 1, Pages 29-42Publisher
SPRINGER
DOI: 10.1007/s12010-018-2900-6
Keywords
Sugarcane bagasse pretreatment; Inhibitors; Enzymes; Polyethylene glycol; Polyvinylpyrrolidone
Funding
- CNPq
- Brazilian institution FAPEMIG
- Brazilian institution CAPES
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Considering bioethanol production, extensive research has been performed to decrease inhibitors produced during pretreatments, to diminish energy input, and to decrease costs. In this study, sugarcane bagasse was pretreated with NaOH, H2SO4, and water. The higher concentration of phenols, 3.3g/L, was observed in biomass liquid fraction after alkaline pretreatment. Acid pretreatment was responsible to release considerable acetic acid concentration, 2.3g/L, while water-based pretreatment was the only to release formic acid, 0.02g/L. Furans derivatives were not detected in liquid fractions regardless of pretreatment. Furthermore, washing step removed most of the phenols from pretreated sugarcane bagasse. Saccharification of alkali-pretreated biomass plus polyethylene glycol (PEG) at 0.4% (w/v) enhanced 8 and 26% the glucose and the xylose release, respectively, while polyvinylpyrrolidone (PVP) also at 0.4% (w/v) increased the release by 10 and 31% of these sugars, respectively, even without washing and filtration steps. Moreover, these polymers cause above 50% activation of endoglucanase and xylanase activities which are crucial for biomass hydrolysis.
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