Recent progress in deep eutectic solvent(DES) fractionation of lignocellulosic components ： A review

High-value utilization of plant resources is crucial for achieving carbon neutrality and complete carbon transformation. Significant progress has already been made in the comprehensive utilization of plant resources through pretreatment methods, particularly the deep eutectic solvent (DES) method for the pretreatment of plant fibers. This method enables sustainable development of lignocellulose deconstruction and high-value utilization. This paper provided a review of the composition, classification, and properties of different types of DES. It also investigated the effects of stoichiometric ratio, temperature, time, microwave, ultrasonic, hydrothermal, and emulsification on lignocellulose deconstruction using the DES. Additionally, the study explored the use and prospects of lignocellulosic fractions in lignin extraction, enzymatic saccharification, and high-value cellulose production using functional DES systems. The evaluation of the DES functionality is conducted through quantum chemistry, molecular simulation calculations, and the DES recycling effects (optimum 10 cycles). The mechanism of DES in lignocellulosic extraction is elucidated, and the prospects for sustainable development are outlined.