초록
<P><B>Abstract</B></P> <P>In this study, a new pretreatment strategy for lignocellulosic was developed using a fully recyclable solid acid, Toluenesulfonic acid (<I>p</I>-TsOH). A combined hydrolysis factor (CHF) as a pretreatment severity was used to balance enzymatic saccharification and the structural characteristics of lignin. The results from degradation of carbohydrates, enzymatic hydrolysis of cellulose and characterization of lignin by FT-IR, <SUP>31</SUP>P NMR, GPC, 2D-HSQC NMR indicated that a CHF of approximately 3.90 was the optimal pretreatment severity to facilitate enzymatic saccharification and the potential serviceability of lignin. Then approximately 90% of the xylan was removed to result in a reasonable sugar yield of 76%. Residual lignin showed low molecular weight (Mw, 5783g/mol), narrow polydispersities (Mw/Mn, 1.10) and high content of phenolic hydroxyl groups (3.702mmol/g); it may be a potential feedstock for phenol monomer and polymeric materials production. In short, this process was regarded as a promising approach to achieve an efficient conversion of lignocellulosic biomass to sugar products and lignin-based materials.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A new pretreatment strategy for lignocellulose with a fully recyclable solid acid was developed. </LI> <LI> This pretreatment method greatly facilitates the enzymatic saccharification of the substrates. </LI> <LI> The structural characteristic of residual lignin was comprehensively elucidated. </LI> <LI> A CHF as a pretreatment severity was used to balance enzymatic hydrolysis and lignin structure. </LI> </UL> </P>