A5054854659- Lignin and Wood Chemistry
- Advanced Cellulose Research Studies
- Enzyme-mediated dye degradation
- NMR spectroscopy and applications
- Biofuel production and bioconversion
- Advanced NMR Techniques and Applications
- Catalysis for Biomass Conversion
- Ionic liquids properties and applications
- Fermentation and Sensory Analysis
- Nanocomposite Films for Food Packaging
- Plant Gene Expression Analysis
- Carbohydrate Chemistry and Synthesis
- Protein Structure and Dynamics
- biodegradable polymer synthesis and properties
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Aerogels and thermal insulation
- Porphyrin and Phthalocyanine Chemistry
- Biochemical and biochemical processes
- Enzyme Structure and Function
- Signaling Pathways in Disease
- Analytical Chemistry and Chromatography
- Molecular spectroscopy and chirality
- Photosynthetic Processes and Mechanisms
- Electron Spin Resonance Studies
University of Helsinki
2016-2025
Swedish Chemicals Agency
2010-2014
Kemerovo Cardiology Center
1996-2012
North Carolina State University
2007-2010
Dublin City University
2010
Helsinki Institute of Physics
1995-2007
University of Jyväskylä
2005
Brigham and Women's Hospital
2005
University of Oulu
2003-2005
Monash University
2005
The present paper demonstrates that both hardwoods and softwoods are readily soluble in various imidazolium-based ionic liquids (ILs) under gentle conditions. More specifically, a variety of can only partially dissolve wood chips, whereas such as 1-butyl-3-methylimidazolium chloride 1-allyl-3-methylimidazolium have good solvating power for Norway spruce sawdust Southern pine thermomechanical pulp (TMP) fibers. Despite the fact obtained solutions were not fully clear, these provided which...
The ionic liquids 1-ethyl-3-methylimidazolium acetate [emim]OAc, N,N,N,N-tetramethylguanidium propionate [TMGH]EtCO2, and [TMGH]OAc, the traditional cellulose solvent N-methylmorpholine N-oxide NMMO were characterized for their Kamlet–Taft (KT) values at several water contents temperatures. For NMMO, thresholds of regeneration solutions by determined using nephelometry rheometry. Regeneration from wet IL was found to be asymmetric compared dissolution into IL. KT parameters remain almost...
Heating up: Improved recyclability is necessary for ionic liquids destined wood-based bioprocessing platforms. New “distillable” molten acid–base conjugates efficiently dissolve cellulose at temperatures of 100 °C. Increased temperature induces a shift the equilibrium toward neutral species (see picture, TMG=1,1,3,3-tetramethylguanidine), thus affording vapor pressure and allowing distillation mixture. Detailed facts importance to specialist readers are published as ”Supporting Information”....
Polymer shape-memory aerogels (PSMAs) are prospects in various fields of application ranging from aerospace to biomedicine, as advanced thermal insulators, actuators, or sensors. However, the fabrication PSMAs with good mechanical performance is challenging and currently dominated by fossil-based polymers. In this work, strong, bio-aerogels high specific surface areas (up 220 m2/g) low radial conductivity (0.042 W/mK) were prepared through a one-step treatment native wood using an ionic...
A quantitative method to record 1H-13C correlation NMR spectra (Q-HSQC) is presented. The suppression of 1JCH-dependence achieved by modulating the polarization transfer delays HSQC. In addition, effect homonuclear couplings, as well relaxation during pulse sequence are discussed. We developed Q-HSQC approach for analysis wood lignin, a complex polymer where it has been difficult obtain reliable data on relative amounts different structural units. current applicable variety mixtures, normal...
Homogenous acylation and carbanilation reactions of wood-based lignocellulosic materials have been investigated in ionic liquids. We found that highly substituted esters can be obtained under mild conditions (2 h, 70 °C) by reacting wood dissolved liquids with acetyl chloride, benzoyl acetic anhydride the presence pyridine. In absence pyridine, extensive degradation components was to occur. Highly carbanilated material also base liquid. These chemical modifications were confirmed infrared...
Abstract Different acid–base conjugates were made by combining a range of bases and superbases with acetic propionic acid. Only the combinations that contained capable dissolving cellulose. Proton affinities calculated for bases. A range, within which cellulose dissolution occurred, when combined or acid, was defined further use. This above proton affinity value about 240 kcal mol −1 at MP2/6‐311+G(d,p)//MP2/ 6‐311+G(d,p) ab initio level. Understanding allowed us to determine cation acidity...
Determination of molecular weight parameters native and, in particular, technical lignins are based on size exclusion chromatography (SEC) approaches. However, no matter which approach is used, either conventional SEC with a refractive index detector and calibration standards or multi-angle light scattering (MALS) detection at 488 nm, 633 658 690 all variants can be severely erroneous. The lack high structural similarity to lignin impairs the quality molar masses determined by SEC, typical...
Recent developments in ionic liquid electrolytes for cellulose or biomass dissolution has also allowed high-resolution 1H and 13C NMR on very high molecular weight cellulose. This permits the development of advanced liquid-state quantitative methods characterization unsubstituted low degree substitution celluloses, example, surface-modified nanocelluloses, which are insoluble all solvents. As such, we present use tetrabutylphosphonium acetate ([P4444][OAc]):DMSO- d6 electrolyte 1D 2D...
Eco-friendly materials with superior thermal insulation and mechanical properties are desirable for improved energy- space-efficiency in buildings. Cellulose aerogels structural anisotropy could fulfill these requirements, but complex processing high energy demand challenges scaling up. Here we propose a scalable, nonadditive, top-down fabrication of strong anisotropic directly from wood excellent, near isotropic functions. The aerogel was obtained through cell wall dissolution controlled...
Summary De‐ O ‐acylated lipopolysaccharides (LPS) of three polymyxin‐resistant Salmonella typhimurium pmrA mutants and their parent strains were analysed by 31 P‐NMR (nuclear magnetic resonance) in order to assess, relation polymyxin resistance, the types degree substitution phosphates LPS lipid A. mutant phosphate diesters predominated over monoesters, whereas latter more abundant wild‐type LPS. The increase proportion was traced both core oligosaccharide lipld A part. In latter,...
Modern multidimensional NMR spectroscopic methods were applied to investigate the effects of kraft pulping and oxygen delignification on lignin side-chain structures. In addition two-dimensional HSQC measurements, three-dimensional HSQC−TOCSY technique was utilized elucidate 1H−1H 1H−13C correlations individual spin systems thus indicate a certain structure. Unlike earlier, nonlabeled samples used for 3D measurements. According 2D spectra, most structures identified in milled wood (MWL) are...
Levosimendan is an inodilatory drug that mediates its cardiac effect by the calcium sensitization of contractile proteins. The target protein levosimendan troponin C (cTnC). In current work, we have studied interaction with Ca(2+)-saturated cTnC heteronuclear NMR and small angle x-ray scattering. A specific between Ca(2+)-loaded regulatory domain recombinant cTnC(C35S) was observed. changes in spectra N-domain full-length cTnC(C35S), due to binding primary site, were indicative a slow...
The toxicity of some promising biomass-dissolving amidinium-, imidazolium-, and phosphonium-based ionic liquids (ILs), toward two different cell lines, human corneal epithelial cells Escherichia coli bacterial cells, was investigated. In addition, dynamic light scattering (DLS) ζ potential measurements were used to study the effect ILs on size surface charge model liposomes. Capillary electrophoresis (CE) for determination electrophoretic mobilities liposomes critical micelle concentration...
The effect of 11 common amidinium, imidazolium, and phosphonium based ionic liquids (ILs) on zebrafish (Danio rerio) Chinese hamster ovary cells (CHO) was investigated with specific emphasis the anion cation chain length aggregation ILs. Viability behavioral alteration in locomotor activity place preference, after IL treatment 5 days postfertilization larvae, recorded. Behavior histological damage evaluation performed for adult fish order to get insight into long-term effects two potential...
A laboratory batch simulation of the recovery and reuse [DBNH][OAc] in IONCELL-F process, yielding future directions for optimising recycling process.
Abstract The limited access to fast and facile general analytical methods for cellulosic and/or biocomposite materials currently stands as one of the main barriers progress these disciplines. To that end, a diverse set narrow techniques are typically employed often time-consuming, costly, not necessarily available on daily basis practitioners. Herein, we rigorously demonstrate quantitative NMR spectroscopic method structural determination crystalline cellulose samples. Our relies use readily...