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Lignocellulosic biomass has emerged as a promising alternative with sustainable advantages for the production of a wide range of renewable products and value-added chemicals. In this study, a pretreatment strategy that use a fully recyclable acid hydrotrope (p-TsOH aqueous solution) to extract lignin and employ glyoxylic acid (GA) to stabilize lignin was proposed for biomass valorization toward multipurpose fractionation. 83.0 % of lignin was dissolved out by p-TsOH hydrotrope (80 wt%) with GA addition to form GA-stabilized product at 80 o C for 15 min. The stabilized lignin was subsequently used as an additive in the preparation of lignin-based suncream. Notably, the incorporation of 4 wt% lignin nanospheres into an SPF15 sunscreen yielded a measured SPF of 59.94. Furthermore, the depolymerization of uncondensed lignin into aromatic monomers yielded a high lignin-oil yield of 84.2 %. Additionally, direct heating of the pretreatment liquor facilitated the conversion of monosaccharides into furfural, achieving a desired yield of 53.7 % without the addition of any acid catalyst. The pretreatment also enhanced the enzymatic hydrolysis of glucan, resulting in a saccharification yield of 98.4 %. Moreover, short-term ultrasonication of the pretreated substrate yielded pulp suitable for papermaking. Incorporating 15 wt% fibers into the produced paper sheets led to a 5.3 % increase in tear index and a 25.4 % increase in tensile index. This study presents a viable pretreatment strategy for the multipurpose fractionation of lignocellulosic biomass, offering potential avenues for biomass valorization., Competing Interests: Declaration of competing interest All authors declare that they have no conflict of interest., (Copyright © 2024 Elsevier B.V. All rights reserved.)

Neutral and acidic monosaccharides, commonly present as structural units in wood-derived hemicelluloses, were derivatized by reductive amination using 6-aminoquinoline (6-AQ) and subsequently separated as their borate complexes by capillary zone electrophoresis. By using a quite concentrated (420 mmol 1(-1) alkaline borate buffer, a fused-silica capillary column with a small inner diameter (30 microns nominal I.D.) and a constant power of 1200 mW (corresponding to an applied voltage of approximately 21 kV), optimal separation was achieved. Under these conditions, the monosaccharides investigated were separated with a resolution, Rs, of 1.0-1.2 or greater. On-column UV detection at 245 nm was found to provide highly sensitive detection of the 6-AQ-derivatized monosaccharides. The minimum detectable concentrations were on the order of 10(-6) mol 1(-1) (corresponding to an estimated limit of detection of a few fmol). The linear calibration range of the method, including the 6-AQ derivatization step, was found to be about two orders of magnitude. Several neutral beta (1-4)-D-xylooligomers and acidic oligosaccharides containing 4-O-methyl-D-glucuronic acid units, which are common structural elements in hemicelluloses such as birch and spruce xylan, were also efficiently separated as 6-AQ derivatives, using the same buffer system. Finally, the usefulness of this analytical method has been demonstrated using a spruce wood xylan sample subjected to chemical and enzymatic hydrolysis.