A5015972464- Lignin and Wood Chemistry
- Advanced Cellulose Research Studies
- Proteins in Food Systems
- Fermentation and Sensory Analysis
- Polysaccharides and Plant Cell Walls
- Pickering emulsions and particle stabilization
- Enzyme-mediated dye degradation
- Surfactants and Colloidal Systems
- Natural Fiber Reinforced Composites
- Polysaccharides Composition and Applications
- Protein Hydrolysis and Bioactive Peptides
- Nanocomposite Films for Food Packaging
- Biofuel production and bioconversion
- Horticultural and Viticultural Research
- Polymer Surface Interaction Studies
- Biochemical and biochemical processes
- Microencapsulation and Drying Processes
- biodegradable polymer synthesis and properties
- Meat and Animal Product Quality
- Electrospun Nanofibers in Biomedical Applications
- Tree Root and Stability Studies
- Phytochemicals and Antioxidant Activities
- Force Microscopy Techniques and Applications
- Plant Surface Properties and Treatments
- Food Chemistry and Fat Analysis
Fractionnation of AgroResources and Environment
2015-2024
Université de Reims Champagne-Ardenne
2013-2024
Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement
2020-2024
Institut National de la Recherche Agronomique
2000-2015
Département Environnement et Agronomie
2009
Comité Champagne
2001-2007
CEA Paris-Saclay
2000-2004
Service de Physique de l'État Condensé
2001-2004
Sofia University "St. Kliment Ohridski"
2002
Centre National de la Recherche Scientifique
2000-2001
The production of bio-based composites with enhanced characteristics constitutes a strategic action to minimize the use fossil fuel resources. mechanical performances these materials are related specific properties their components, as well quality interface between matrix and fibers. In previous research study, it was shown that polarity played key role in mechanisms fiber breakage during processing, on final composite. However, some questions remained unanswered, new investigations were...
Novel nanocomposite coatings composed of cellulose nanocrystals (CNCs) and lignin (either synthetic or fractionated from spruce corn stalks) were prepared without chemical modification functionalization (via covalent attachment) one the two biopolymers. The spectroscopic properties these investigated by UV-visible spectrophotometry ellipsometry. When using appropriate weight ratio CNC/lignin (R), systems exhibited high-performance optical properties, high transmittance in visible spectrum,...
Besides classical utilization of wood and paper, lignocellulosic biomass has become increasingly important with regard to biorefinery, biofuel production novel biomaterials. For these new applications the macromolecular assembly cell walls is utmost importance therefore further insights into arrangement molecules on nanolevel have be gained. Cell wall recalcitrance against enzymatic degradation one key issues, since an efficient plant material probably most crucial step in conversion energy....
Poly(lactic acid) or PLA is currently considered as one of the most promising substitutes conventional plastics, with low environmental impact, especially for food packaging applications. Nevertheless, some drawbacks, such high permeability to oxygen, are still limiting its industrial The objective this study was highly increase oxygen barrier performance without compromising sustainable nature and following principles circular economy perspective. Coproducts coming from mill industries,...
Abstract A grass soda technical lignin (PB1000) underwent a process combining solvent fractionation and treatment with an ionic liquid (IL), comprehensive investigation of the structural modifications was performed by using high‐performance size‐exclusion chromatography, 31 P NMR spectroscopy, thioacidolysis, GC–MS. Three fractions distinct reactivity were recovered from successive ethyl acetate (EA), butanone, methanol extractions. In parallel, fraction deprived EA extractives obtained. The...
With the aim of mimicking plant cell wall, a layer by approach was used to build thin film consisting successive adsorption pectin and extensin. Elaboration monitored surface plasmon resonance, quartz crystal microbalance, ellipsometry. All data indicate that formation successful growth occurred according nonuniform growth. It is likely diffusion polymers within multilayer structure final not constituted layered individual extensin films. Polymer rearrangements were also supported atomic...
The antioxidant properties of grass lignins recovered from an alkaline industrial process and different ethanol organosolv pretreatment processes were compared using two types tests: (i) classical radical 2,2′-diphenyl-1-picrylhydrazyl (DPPH•) scavenging tests in dioxane/water or (ii) involving multiphasic systems (lipid dispersion water cellulose film suspended ethanol). These representative food packaging matrices view high-value applications. All lignins, solution the film, effectively...
Atomic force microscopy (AFM) experiments with functionalized tips are currently one of the most powerful tools to locally measure adhesion forces via single-molecule spectroscopy (SMFS) measurements. The main difficulty is precisely control attachment biomolecules cantilever. Different chemistry procedures have been developed including use spacer molecules. Even if a process works well for small such as antibodies, issues remain regarding nanoparticles or larger objects cellulose...
Abstract The physicochemical properties of plant fibres are determined by the fibre morphology and structural features cell wall, which is composed three main layers that differ in chemical composition architecture. This hierarchical structure responsible for many mechanical desirable industrial applications. As interactions between lignocellulosic polymers at molecular level factor governing final cohesion fibres, atomic force microscopy (AFM) well suited observation measurement their...
This study investigated the relationships between lignin molecular and supramolecular structures their functional properties within cellulose-based solid matrix, used as a model biodegradable polymer carrier. Two types of derivatives corresponding to distinct structuration levels were prepared from single technical sample (PB1000): phenol-enriched oligomer fractions colloidal nanoparticles (CLP). The raw its formulated with cellulose nanocrystals or nanofibrils prepare films by chemical...
A comparison of β-casein and symmetrical triblock copolymer (PEO−PPO−PEO PPO−PEO−PPO) adsorption layer properties at the air−water interface has been carried out by bubble tensiometry ellipsometry. It verified that equation state parameters (π ∼ Γy) obtained from surface pressure (π) ellipticity in Brewster conditions (ρB), which is proportional to concentration (Γ) data, are same as those dilational modulus ε π data. These two consistent approaches give further support theoretical model...
The interactions between proteins and plant polyphenols are responsible for astringency haze formation in beverages may participate foam stabilization. effect of phenolic compounds with different structures, namely, catechin (C), epicatechin (Ec), epigallocatechin (Egc), gallate (EcG), (EgcG), on the surface properties at air/liquid interface β-casein, chosen as model protein, were monitored by tensiometry ellipsometry. complexes bulk phase was measured electrospray ionization mass...
Lignocellulosic biomass bioconversion is hampered by the structural and chemical complexity of network created cellulose, hemicellulose lignin. Biological conversion lignocellulose involves synergistic action a large array enzymes including recently discovered lytic polysaccharide monooxygenases (LPMOs) that perform oxidative cleavage cellulose. Using in situ imaging synchrotron UV fluorescence, we have shown addition AA9 LPMO (from Podospora anserina) to cellulases cocktail improves...
Abstract In a series of previous papers, models describing the breakage lignocellulose fibers during melt mixing process were established and applied to predict fiber size changes when compounding composites in twin‐screw extruder. Different types studied (flax, hemp, sisal, etc), but always with same matrix, namely polypropylene (PP) compatibilized PP grafted maleic anhydride (PP‐g‐MA). present study, influence matrix was characterized, by comparing results obtained nonpolar polar...
A new biobased material based on an original strategy using lignin model compounds as natural grafting additive a nanocellulose surface through in situ polymerization of coniferyl alcohol by the Fenton reaction at two pH values was investigated. The structural and morphological properties materials nanoscale were characterized combination analytical methods, including Fourier transform infrared spectroscopy, liquid chromatography combined with mass spectrometry, nuclear molecular resonance...