Addition of alkali to the hydrothermal-mechanochemical treatment of Eucalyptus enhances its enzymatic saccharification

作者：Ishiguro Maki; Endo Takashi^*

来源：Bioresource Technology, 2014, 153: 322-326.

DOI：10.1016/j.biortech.2013.12.015

• Lignocellulosic biomass
• Hydrothermal-mechanochemical treatment
• Sodium hydroxide
• Fibrillation

The effects of alkali on hydrothermal-mechanochemical treatment (hydrothermal treatment combined with wet-milling) were examined with the aim of improving pretreatment of lignocellulosic biomass before enzymatic saccharification. After enzymatic saccharification, the highest glucose yield was obtained by autoclaving at 170 degrees C in the presence of 20% NaOH per substrate weight. The wood fiber was unraveled into finer nanofibers by hydrothermal-mechanochemical treatment, thus increasing the specific surface area of the substrate from 11 to 132 m(2)/g. Adding 20% NaOH to the treatment further increased the specific surface area of the already fibrillated substrate by 76% (232 m(2)/g) due to lignin removal and ester bond cleavage between lignin and hemicellulose. This increase in specific surface area was closely related to the increase in enzymatic digestibility; therefore, NaOH addition may have enhanced the effect of hydrothermal-mechanochemical treatment.

• 出版日期2014-2