The lignin fraction of the lignocellulosic biomass corresponds to 15-30 % wt. This is largely obtained as a by-product of wood pulping to produce cellulose and paper, with the kraft process being the most used by industry. The chemical composition of lignin makes an excellent raw material for obtaining various chemical compounds with industrial applications, such as phenolic resins, biofuels and fine chemical products. Furthermore, lignin has high potential as a raw material for sustainable additives for liquid fuels, due to its aromatic nature, since its alkylphenols can be used as antioxidants. The present work describes a process of catalytic conversion of kraft lignin into phenolic compounds with potential application as industrial antioxidant agents. The hydrogenolysis reactions were performed using methanol, ethanol, isopropanol or isopropanol: formic acid (1: 1 v/v) as organic solvents. For each solvent, four transition metal catalysts were tested (Pd/CaCO, Pd/C, Ru/C and In). Through analyzing UHPLC-ESI-MS (ultra-high performance liquid chromatography-electrospray ionization-mass spectrometry), 19 substances were identified in the isolated fractions, with a predominantly phenolic composition. Based on the efficiency of phenolic substances as antioxidants, an ability to eliminate the DPPH (2,2-diphenyl-1-picrylhydrazyl) radical was evaluated, verifying that 43.75 % of the inherited ones exhibited a high antioxidant potential, superior to kraft lignin and commercial antioxidant BHT (butylated hydroxytoluene).
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11894295 | PMC |
| http://dx.doi.org/10.1016/j.heliyon.2025.e42783 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Catalytic degradation of kraft lignin to determine its antioxidant potential for industrial purposes.
Heliyon
February 2025
Brazilian Agricultural Research Corporation, Parque Estação Biológica, s/n, Av. Asa Norte, Brasília, CEP 70770-901, Brazil.
The lignin fraction of the lignocellulosic biomass corresponds to 15-30 % wt. This is largely obtained as a by-product of wood pulping to produce cellulose and paper, with the kraft process being the most used by industry. The chemical composition of lignin makes an excellent raw material for obtaining various chemical compounds with industrial applications, such as phenolic resins, biofuels and fine chemical products.
View Article and Find Full Text PDFLignin activation with selected ionic liquids based on kinetic and thermodynamic analyses.
Int J Biol Macromol
February 2025
Poznan University of Technology, Faculty of Chemical Technology, Institute of Chemical Technology and Engineering, Berdychowo 4, PL-60965 Poznan, Poland. Electronic address:
Herein, the potential of lignin activation with selected ionic liquids (ILs) was investigated to enhance the usefulness of lignin in materials science and electrochemical systems. The main objective was to increase the carbonyl content in lignin through selective oxidation, which would enable its use as a sustainable alternative, for example, in electrode materials and composite systems. Using ILs as activators, the modification process focused on maintaining the structural integrity of lignin while increasing its functional group profile.
View Article and Find Full Text PDFTowards phosphorylated lignin-based epoxy resins: An integrated technological route to obtain a macromonomer with enhanced thermal and potential flame-retardant properties.
Int J Biol Macromol
February 2025
Department of Organic and Inorganic Chemistry, Federal University of Ceara, 60440-900, Fortaleza, CE, Brazil. Electronic address:
The growing search to replace petrochemical derivatives with materials having renewable origin has increased the prospection for biomolecules from lignocellulosic biomass. The aim of this work was to develop epoxy resins based on kraft lignin (KL) with flame retardant properties by phosphorylation of this lignin followed by its glycidylation. The phosphorylation of KL was carried out using 85 % wt.
View Article and Find Full Text PDFFormation of Homogeneous Lignin Nanoparticles from Industrial Kraft Lignin via Fractionation Combined with Antisolvent Precipitation.
Biomacromolecules
March 2025
Liaoning Key Lab of Lignocellulose chemistry and Biomaterials, The Liaoning Province Key Laboratory of Paper and Pulp Engineering, College of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian, Liaoning 116034, PR China.
Processing lignin into nanoparticles (LNPs) offers a promising utilization strategy; however, its structural and molecular weight heterogeneity poses challenges in the formation of uniform LNPs. In this study, industrial kraft lignin was fractionated in stepwise molecular weight (Mw) from low to high and from which LNPs were fabricated via antisolvent precipitation. The results showed that lignin with high Mw benefits the formation of uniform and smaller-sized LNPs.
View Article and Find Full Text PDFThermal Degradation of Polymer Composites Based on Unsaturated-Polyester-Resin- and Vinyl-Ester-Resin- Filled Kraft Lignin.
Materials (Basel)
January 2025
Department of Polymer Chemistry, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Sklodowska University, Gliniana 33, 20-614 Lublin, Poland.
The creation of heat-resistant polymers represents one of the most significant challenges and priorities in contemporary scientific research. The incorporation of a filler of analogous nature and content into disparate types of resins will facilitate the identification of the relationship between properties and the structure of macromolecular chains in synthetic resins that function as composite matrices. The objective of this study was to ascertain the impact of lignin at 5 and 15% by weight on the thermal degradation of two resin-based composites with disparate structural compositions.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!