A5033473973- Lignin and Wood Chemistry
- Advanced Cellulose Research Studies
- Biofuel production and bioconversion
- biodegradable polymer synthesis and properties
- Polysaccharides and Plant Cell Walls
- Fermentation and Sensory Analysis
- Catalysis for Biomass Conversion
- Enzyme-mediated dye degradation
- Nanocomposite Films for Food Packaging
- Food composition and properties
- Enzyme Production and Characterization
- Carbon dioxide utilization in catalysis
- Material Properties and Processing
- Natural Fiber Reinforced Composites
- Microbial Metabolic Engineering and Bioproduction
- Cultural Heritage Materials Analysis
- Wood Treatment and Properties
- Polysaccharides Composition and Applications
- Biochemical and biochemical processes
- Seaweed-derived Bioactive Compounds
- Wood and Agarwood Research
- Enzyme Catalysis and Immobilization
- Anaerobic Digestion and Biogas Production
- Phytochemicals and Antioxidant Activities
- Catalysis and Hydrodesulfurization Studies
Universität Hamburg
2014-2024
Hamburg University of Technology
2010-2024
Institute of Wood Science and Technology
2009-2017
Institut für Holztechnologie Dresden
1994-2015
Johann Heinrich von Thünen-Institut
2009-2011
Forestry Research Centre
2009
Fractionnation of AgroResources and Environment
2009
Centre de Recherches sur les Macromolécules Végétales
2009
Université Joseph Fourier
2009
Université de Reims Champagne-Ardenne
2009
Abstract Lytic polysaccharide monooxygenases (LPMOs) are a class of powerful oxidative enzymes that breakdown recalcitrant polysaccharides such as cellulose. Here we investigate the action LPMOs on cellulose fibers. After enzymatic treatment and dispersion, LPMO-treated fibers show intense fibrillation. Cellulose structure modifications visualized at different scales indicate LPMO creates nicking points trigger disintegration fibrillar with rupture chains release elementary nanofibrils....
Abstract The reactivity and physicochemical properties of lignins are partly governed by their molar mass distribution. development reliable standard methods for determination the distribution is not only relevant designing technical specific applications, but also monitoring elucidating delignification pulping processes. Size-exclusion chromatography (SEC) offers many advantages, such as wide availability, short analysis time, low sample demand, over a range. A collaborative study has been...
The monosaccharide composition of four different samples brown seaweeds <italic>Laminaria digitata</italic> and <italic>Saccharina latissima</italic> were compared by high performance anion exchange chromatography (HPAEC) methods after acid hydrolysis treatments or a cellulase treatment.
Abstract The transformation of lignocellulosic biomass into bio‐based commodity chemicals is technically possible. Among thermochemical processes, fast pyrolysis, a relatively mature technology that has now reached commercial level, produces high yield an organic‐rich liquid stream. Despite recent efforts to elucidate the degradation paths during selectivity and recovery rates bio‐compounds remain low. In attempt clarify general scheme pyrolysis provide quantitative insight, use...
Fucoidans are sulphated fucose-rich polysaccharides predominantly found in the cell walls of brown algae. The bioactive properties fucoidans attract increasing interest from medico-pharmaceutical industries and may drive an increase demand algae biomass. In nature, biochemical composition displays a seasonal fluctuation driven by environmental factors endogenous rhythms. To cultivate harvest kelps with high yields fucoidans, knowledge is needed on variation impact conditions fucoidan content...
In recent years, significant amounts of various lignins became commercially available. Their technical utilization for thermosets such as phenol formaldehyde resins is widely discussed an added value. However, the comparably low number reactive sites still limiting in higher proportions. To overcome this obstacle, can be activated by phenolation prior to resin synthesis. study, applicability and outcome was studied a set organosolv from hardwood, softwood, annual plants compared their...
A facile approach to obtaining cellulose nanofiber-reinforced polystyrene with greatly improved mechanical performance compared unreinforced is presented. Cellulose nanofibers were obtained by fibrillation of partially delignified wood (MFLC) and from bleached pulp. Residual hemicellulose lignin imparted amphiphilic surface chemical character MFLC, which enabled the stabilization emulsions styrene in water. Upon suspension polymerization emulsion, microspheres coated MFLC obtained. When...
European paper mills are currently facing the question of whether recovered paper, their main raw material, will be available in sufficient quantities and an acceptable quality future. An alternative to or wood fiber is use agricultural residues such as wheat straw. Sodium carbonate-based straw pulping processes have advantage not requiring recausticizing for chemical recovery, which reduces investment operating costs. With addition oxygen, delignification can significantly improved provide...
Abstract An efficient, nontoxic, and solvent-free oxyalkylation of European beech wood organosolv lignin (OL) has been developed. Two approaches were studied: a direct reaction with propylene carbonate (PC) two-step maleic anhydride (MA) followed by PC. The structural analysis polyols was performed 1 H NMR, 13 C 31 P FTIR spectroscopy. It demonstrated that PC able to almost completely oxypropylate aliphatic phenolic OH groups. Moreover, the carboxylic acid groups maleated OL fully...
Cellulose acetate (CA)-based materials, like cigarette filters, contribute to landscape pollution challenging municipal authorities and manufacturers. This study investigates the potential of enzymes degrade CA be potentially incorporated into respective enhancing biodegradation. Deacetylation studies based on Liquid Chromatography-Mass Spectrometry-Time Flight (LC-MS-TOF), High Performance Chromatography (HPLC), spectrophotometric analysis showed that tested esterases were able deacetylate...
The dimensional stability of thermally modified wood exposed to several wetting-drying cycles was analyzed. Specimens dimensions 15×15 ×15 mm were at 180 and 200 °C. mass loss chemical composition the determined in order evaluate effect degree modification. Afterwards, radial, tangential, volumetric swelling, anti-swelling efficiency, water absorption, repellence due compared. specimen’s tended decrease with each additional rewetting cycle. Additional extractives that formed via thermal...
The high-value utilization of lignins is the most prominent opportunity to enhance competitiveness lignocellulosic biorefineries and reduce dependence on fossil resources. incorporation lignin into phenol–formaldehyde (LPF) resins represents a viable route toward this target. Due its macromolecular nature, could function as structural backbone in resin prepolymer. However, low number reactive sites with respect chemistry hinders effective condensation reactions. Here, we present effects...
Abstract In this work, we present an approach to cross-link cellulose nanofibrils (CNFs) with various metallic cations (Fe 3+ , Al Ca 2+ and Mg ) produce inks suitable for three-dimensional (3D) printing application. The printability of each hydrogel ink was evaluated, several parameters such as the optimal ratio M n+ :TOCNF:H 2 O were discussed. CNF suspensions produced by mechanical disintegration pulp a microfluidizer then oxidized 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO). Finally,...