Efficient extracellular laccase secretion via bio-designed secretory apparatuses to enhance bacterial utilization of recalcitrant lignin

Our study advances the knowledge of secretion mechanisms in Gram-negative bacteria and provides novel insights into the lignin utilization by extracellular lignolytic enzyme-bacterial cell systems.

Production of Alkoxyl-Functionalized Cyclohexylamines from Lignin-Derived Guaiacol

Transformation of renewable lignin-based platform chemicals into value-added nitrogen-containing compounds is an emerging strategy for lignin utilization. However, multi reactive sites on these platform chemicals afford it being challenging to...

Effects of metal site and acid site on the hydrogenolysis of cornstalk in supercritical ethanol during lignin-first fractionation

Lignin-first strategy is promising in lignin utilization to produce value-added aromatic compounds and their derivatives for a high efficiency. Herein, we explore the hydrogenolysis of cornstalk lignin in supercritical ethanol...

Multifunctional lignin-based nanocomposites and nanohybrids

Significant progress in lignins valorization and development of high-performance sustainable materials have been achieved in recent years. Reports related to lignin utilization indicate excellent prospects considering green chemistry, chemical engineering,...

Lignin Precipitation and Fractionation from OrganoCat Pulping to Obtain Lignin with Different Sizes and Chemical Composition

Fractionation of lignocellulose into its three main components, lignin, hemicelluloses, and cellulose, is a common approach in modern biorefinery concepts. Whereas the valorization of hemicelluloses and cellulose sugars has been widely discussed in literature, lignin utilization is still challenging. Due to its high heterogeneity and complexity, as well as impurities from pulping, it is a challenging feedstock. However, being the most abundant source of renewable aromatics, it remains a promising resource. This work describes a fractionation procedure that aims at stepwise precipitating beech wood (Fagus sp.) lignin obtained with OrganoCat technology from a 2-methyltetrahydrofuran solution, using n-hexane and n-pentane as antisolvents. By consecutive antisolvent precipitation and filtration, lignin is fractionated and then characterized to elucidate the structure of the different fractions. This way, more defined and purified lignin fractions can be obtained. Narrowing down the complexity of lignin and separately valorizing the fractions might further increase the economic viability of biorefineries.