초록
<P><B>Abstract</B></P> <P>A novel and efficient organic amine and organosolv synergetic pretreatment method was developed to overcome the recalcitrance of lignocellulose to produce fermentable sugars and high-quality salt-free lignin. After optimization of the process parameters, a delignification of 81.7% and total sugar yield of 83.2% (87.1% glucose, 75.4% xylose) could be obtained using <I>n</I>-propylamine (10mmol/g, biomass) as a catalyst and aqueous ethanol (60%, v/v) as a solvent. The susceptibility of the substrates to enzymatic digestibility was explained by their physical and chemical characteristics. The physical structure of extracted lignin showed higher <I>β</I>-aryl ether bonds content and functionalities, offering the potential for further downstream upgrading. The role of organic amine catalyst and a synergistic mechanism is proposed for the present system.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Organic amine catalytic organosolv pretreatment was developed. </LI> <LI> High yield of monosaccharide was obtained after pretreatment and enzymatic hydrolysis. </LI> <LI> High-quality and salt-free lignin was produced from pretreatment. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>