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43 results found
Ionic liquids (ILs) can be used to sustainably convert lignocellulosic feedstocks into renewable bio-based materials and chemicals. To improve the prospects of commercialization, it is essential to investigate the fate of lignocellulosic biomass during IL-based processing and develop tools for…
Author(s): Kalavathy Rajan, Thomas Elder, Nourredine Abdoulmoumine, Danielle Julie Carrier, Nicole Labbé
Keywords: Ionic liquids, Lignocellulosic biomass, Bio-based products, Biomass dissolution, Cell wall swelling, In-situ characterization, High-throughput screening, Cellulose crystallinity, Hemicellulose deacetylation, Lignin, Molecular weight, Semi-empirical polarity scales
Source: Green Chemistry
Year: 2020
Without periodic fire, historically open-canopied, oak-dominated upland woodlands of the central and eastern United States are shifting to closed-canopied forests with increased abundance of shade-tolerant and typically fire-sensitive species. Once established, these encroaching species (i.e.,…
Author(s): E.K. Babl-Plauche, H.D. Alexander, C.M. Siegert, J.L. Willis, A.I. Berry
Keywords: Flammability, Lignin, Fire suppression, Red maple, American beech, Hickory
Source: Forest Ecology and Management
Year: 2022
A lignin-derived mesoporous carbon solid acid catalyst (LDMCC) was prepared using alkali lignin as a carbon source and KCl as a salt template to generate a carbon support that was carboxylated with acrylic acid. The prepared LDMCCs were characterized by various spectroscopies (FTIR, XPS, XRD, Raman…
Author(s): Shuai Wang, Thomas L. Eberhardt, Hui Pan
Keywords: Lignin, weak acid, mesoporous carbon, fructose, 5-HMF, solid acid catalyst
Source: Fuel journal
Year: 2022
The retro-aldol reaction is one of the key steps involved in the oxidative conversion of lignin to aromatic aldehydes and acids. In principle, the retro-aldol reaction can proceed in the absence of oxygen. In this work, a new approach based on the influence of oxygen on the oxidation of lignin was…
Author(s): Ajinkya More, Thomas Elder, Zhihua Jiang
Keywords: Lignin, Vanillin, Vanillic acid, Oxidation, Retro-aldol reaction, Technology
Source: International Journal of Biological Macromolecules
Year: 2021
Two fungal chloroperoxidases (CPOs), the heme enzyme from Caldariomyces fumago and the vanadium enzyme from Curvularia inaequalis, chlorinated 1-(4-ethoxy-3-methoxyphenyl)-2-(2-methoxyphenoxy)-1,3-dihydroxypropane, a dimeric model compound that represents the major nonphenolic structure in lignin.…
Author(s): Patricia Ortiz-Bermudez, Ewald Srebotnik, Kenneth E. Hammel
Keywords: Lignin, chlorination, cleavage, fungal chloroperoxidases, Caldariomyces fumago, Curvularia inaequalis
Source: Applied and environmental microbiology. Vol. 69, no. 8 (Aug. 2003): p. 5015-5018.
Year: 2003
A program was undertaken at the Forest Products Laboratory in conjunction with the American Society for Testing and Materials (ASTM) to develop guidelines for a credible accelerated photoaging protocol for printing and writing papers. In support of this, indepth studies of photodegredation were…
Author(s): James S. Bond, Rajai H. Atalla, Agarwal Umesh P., Chris G. Hunt
Keywords: Paper, Photolysis, Lignin, Aging, Light regime, Exposure, Quantitative analysis, Prediction
Source: [10th International Symposium on Wood and Pulping Chemistry, Main Symposium, 1999 June 07-10, Yokohama, Japan]. Atlanta, GA : TAPPI Press, 1999.:p. 500-504 : ill.
Year: 1999
Our understanding of the molecular architecture of intact, native plant cell walls is very limited. Traditional methods of investigation disturb the tissue to varying degrees and conclusions based on these methods may be intimately related to the technique used. A promising new technique to study…
Author(s): James S. Bond, Rajai H. Atalla
Keywords: Pinus taeda, Tracheids, Molecular biology, Cell structure, Cell walls, Spectroscopy, Chemical composition, Cellulose, Lignin, Probes, Raman spectroscopy
Source: [10th International Symposium on Wood and Pulping Chemistry, Main Symposium, 1999 June 07-10, Yokohama, Japan]. Atlanta, GA : TAPPI Press, 1999.:p. 96-101 : ill.
Year: 1999
Data suggest that the dimerization of coniferyl alcohol is not under thermodynamic control. In this study, molecular dynamics calculations were used to estimate the effect of the solvent environment. In water, the coniferyl alcohol radicals were forced to associate by the formation of a solvent…
Author(s): Carl J. Houtman
Keywords: Alcohols, Solvents, Lignin, Biosynthesis, Coniferyl alcohol, Dimerization, Molecular dynamics
Source: Holzforschung. Vol. 53, no. 6 (1999).:p. 585-589 : ill.
Year: 1999
Past work has shown that the extracellular manganese- dependent peroxidases (MnPs) of ligninolytic fungi degrade the principal non-phenolic structures of lignin when they peroxidize unsaturated fatty acids. This reaction is likely to be relevant to ligninolysis in sound wood, where enzymes cannot…
Author(s): Alexander N. Kapich, Kenneth A. Jensen, Kenneth E. Hammel
Keywords: Lignin, Biodegradation, Decay fungi, Wood destroying fungi, Lipid peroxidation, Manganese peroxidase, Peroxyl radicals
Source: FEBS letters. No. 461 (1999).:p. 115-119 : ill.
Year: 1999
Peroxidase/H2O2-mediated radical coupling of hydroxycinnamaldehydes produced 81O14-, 8-5-, 818-, and 5-5dimers as had been documented earlier (although we found that the 815-dimer is produced in its cyclic phenylcoumaran form at neutral pH). Spectral data from dimers and oligomers has allowed a…
Author(s): John Ralph, Hoon Kim, Fachuang Lu, Sally A. Ralph, Larry L. Landucci, Takashi Ito, Shingo Kawai
Keywords: Lignin, Aldehydes, Spectral analysis, Hydroxycinnamaldehydes, Dimers, Oligomers, Coniferaldehyde, Copolymers, Coniferyl alcohol, Synthetic lignins
Source: [10th International Symposium on Wood and Pulping Chemistry, Main Symposium, 1999 June 07-10, Yokohama, Japan]. Atlanta, GA : TAPPI Press, 1999.:p. 58-63 : ill.
Year: 1999