“…In addition to all of these methods, researchers are concentrating on the in situ conversion of the lignin moiety exclusively to produce fine compounds from lignocellulosic biomass via oxidative, reductive, and biochemical processes. [45][46][47][48][49] During biomass pretreatment, the upgrading of lignin has been hindered because of its heterogeneous structure, ineffective extraction, condensation, and biomass recalcitrance. Hence, for better lignin valorization, to carry out efficient extraction along with high-purity lignin, there should be an effective fractionating process.…”