A5090704313- Lignin and Wood Chemistry
- Enzyme-mediated dye degradation
- Biofuel production and bioconversion
- Fermentation and Sensory Analysis
- Advanced Cellulose Research Studies
- Biochemical and biochemical processes
- Thermochemical Biomass Conversion Processes
- Catalysis for Biomass Conversion
- Dyeing and Modifying Textile Fibers
- Phytochemicals and Antioxidant Activities
- Synthesis and Biological Evaluation
- biodegradable polymer synthesis and properties
- Wood Treatment and Properties
- Natural Fiber Reinforced Composites
- Spectroscopy and Chemometric Analyses
- Synthesis and Reactivity of Heterocycles
- Polysaccharides and Plant Cell Walls
- Food composition and properties
- Chemical Synthesis and Analysis
- Synthesis and bioactivity of alkaloids
- Dye analysis and toxicity
- Spectroscopy Techniques in Biomedical and Chemical Research
- Materials Engineering and Processing
- Material Properties and Processing
- Adsorption and biosorption for pollutant removal
VTT Technical Research Centre of Finland
2013-2022
Tieto (Finland)
2011-2020
University of Helsinki
1985-2012
Wageningen University & Research
2008
Keskuslaboratorio
2001-2007
Lignin-derived inhibition is a major obstacle restricting the enzymatic hydrolysis of cell wall polysaccharides especially with softwood lignocellulosics. Enzyme adsorption on lignin suggested to contribute inhibitory effect lignin. The interaction cellulases was studied in present work commercial Trichoderma reesei (Celluclast) and lignin-rich residues isolated from steam pretreated (SPS) by acid hydrolysis. Both preparations inhibited microcrystalline cellulose (Avicel) adsorbed cellulase...
Technical lignins are structurally heterogeneous and polydisperse. This work describes the use of a simple green method for lignin fractionation, using different proportions acetone (40 60%) in water. Lignins from three sources (wheat straw organosolv lignin, wheat soda softwood kraft lignin) were used this fractionation protocol. The obtained fractions showed molar mass functional groups. lower more phenolic hydroxyl groups carboxylic acid moieties than higher fractions, which also...
The standard method for determining the biomass composition, in terms of main lignocellulosic fraction (hemicellulose, cellulose and lignin) contents, is by chemical method; however, it a slow expensive methodology, which requires complex techniques use multiple reagents. objective this article to provide new efficient, low-cost fast determination contents different types biomasses from agricultural by-products softwoods hardwoods. based on applying deconvolution derivative thermogravimetric...
The accurate and reproducible determination of lignin molar mass by using size exclusion chromatography (SEC) is challenging. association effects, known to dominate underivatized lignins, have been thoroughly addressed reaction with acetyl bromide in an excess glacial acetic acid. combination a concerted acetylation the introduction bromine within alkyl side chains thought be responsible for observed excellent solubilization characteristics acetobromination imparts variety samples. proposed...
Commercial chemical sunscreens have a high content of synthetic ultraviolet (UV) actives that caused widespread damage to marine ecosystems and may adverse health effects in humans. In the present work, safer bio-based with lignin UV absorbers were developed address this issue. Partly demethylated otherwise altered kraft lignins, so-called CatLignins abundant phenolic hydroxyl auxochromes catechol units, outperformed regular lignins as sunscreen terms sun protection factor (UVB–SPF) UVA–UVB...
Brewer's spent grain (BSG), the major side stream of brewing, consists husks and residual parts malts after mashing process. BSG was enzymatically fractionated by a two-step treatment with carbohydrate- protein-degrading enzymes, which solubilized 66% BSG. contained 11% lipids, were mostly triglycerides, but also notable amount free fatty acids present. Lipids due to alkaline pH applied in protease treatment. The main linoleic, palmitic, oleic acids. Several lignans identified BSG,...
Technical lignins are widely available as side streams from pulping and biorefining processes. The aromatic structure of such could be exploited in coating formulations to provide antioxidant or UV-blocking functionalities packaging films. In this study, six technical sourced different plant species by given isolation/modification methods were compared for their composition, molar mass, functional groups. then used prepare thin spin-coated films aqueous ammonia media. All the formed...
The modification of the lignin structure an eucalyptus feedstock during alkaline delignification by kraft, soda-AQ, and soda-O2 cooking processes has been investigated different analytical techniques (size exclusion chromatography (SEC), pyrolysis gas chromatography–mass spectroscopy (Py-GC/MS), 1H–13C two-dimensional nuclear magnetic resonance (2D-NMR), 31P NMR). characteristics lignins were compared at pulp kappa levels, with native isolated from wood. structural differences between...
Abstract Sequential extraction method was applied to lignins from hardwood and softwood isolated by kraft VTT organosolv processes. Solvent found fractionate lignin according the molecular weight: small weight is dissolved in organic solvents with higher enriched into residue. Isolated acetone fractions of are more homogeneous narrow distributions. Based on 31 P NMR results, both total hydroxyl content phenolic units fraction than Pyrolysis-GC/MS all showed that p- hydroxy phenols residues....
Chemical changes of lignin induced by the steam explosion (SE) process were elucidated. Wheat straw was studied as raw material, and lignins isolated enzymatic mild acidolysis (EMAL) procedure before after SE treatment for analyses mainly two-dimensional (2D) [heteronuclear single-quantum coherence (HSQC) heteronuclear multiple-bond correlation (HMBC)] 31P nuclear magnetic resonance (NMR). The β-O-4 structures found to be homolytically cleaved, followed recoupling β-5 linkages. homolytic...