A5091075509- Lignin and Wood Chemistry
- Wood Treatment and Properties
- Cynara cardunculus studies
- Plant Surface Properties and Treatments
- Biofuel production and bioconversion
- Thermochemical Biomass Conversion Processes
- Advanced Cellulose Research Studies
- Forest ecology and management
- Natural Fiber Reinforced Composites
- Phytochemicals and Antioxidant Activities
- Fermentation and Sensory Analysis
- Tree Root and Stability Studies
- Biodiesel Production and Applications
- Postharvest Quality and Shelf Life Management
- Plant biochemistry and biosynthesis
- Allelopathy and phytotoxic interactions
- Material Properties and Processing
- Bioenergy crop production and management
- Enzyme-mediated dye degradation
- Anaerobic Digestion and Biogas Production
- Essential Oils and Antimicrobial Activity
- Biochemical and biochemical processes
- Forest Biomass Utilization and Management
- Composting and Vermicomposting Techniques
- Plant Pathogens and Fungal Diseases
University of Lisbon
2016-2025
Lusíada University of Lisbon
2017
The composition and structure of lignin in different tissues-phellem (cork), phloem xylem (wood)-of Quercus suber was studied. Whole cell walls their respective isolated milled lignins were analyzed by pyrolysis coupled with gas chromatography/mass spectrometry (Py-GC/MS), two-dimensional nuclear magnetic resonance spectroscopy (2D-NMR) derivatization followed reductive cleavage (DFRC). Different tissues presented varied p-hydroxyphenyl:guaiacyl:syringyl (H:G:S) compositions. Whereas from...
These past years have seen an enormous development of the area natural antioxidants and antimicrobials. Eucalyptus globulus is widely cultivated in subtropical Mediterranean regions intensive short rotation coppice plantations. In Portuguese context, E. third species terms forest area. The stump basal part tree, including near-the-ground stem portion woody roots that remain after felling. purpose this work was to study phytochemical profile evaluate antioxidant antimicrobial properties...
Abstract Lignins from different tree barks, including Norway spruce ( Picea abies ), eucalyptus Eucalyptus globulus mimosa Acacia dealbata ) and blackwood acacia A. melanoxylon are thoroughly characterized. The lignin E. bark is found to be enriched in syringyl (S) units, with lower amounts of guaiacyl (G) p ‐hydroxyphenyl (H) units (H/G/S ratio 1:26:73), which produces a that highly β‐ether linkages (83 %), whereas those the two barks have similar compositions ≈5:50:45), predominance...
Natural and thermally modified Pine, Ash, Acacia woods were exposed in two different environments: urban maritime/industrial. The weathering effects evaluated during 24 months regarding color, chemical, structural changes. In all wood species, thermal modification induced All became darker (Pine ΔL*: -32.01; Ash -36.83; -27.50), total extractives content increased (Pine: 19 %; Ash: 32 % Acacia: 18 %), the samples presented deformation damaged cells. Total lignin was not significantly...
Recent investigations have revealed that, in addition to monolignols, some phenolic compounds derived from the flavonoid and hydroxystilbene biosynthetic pathways can also function as true lignin monomers plants. In this study, we found that glucosides isorhapontin (isorhapontigenin-
The present work determines the chemical and thermal characteristics as well phytochemical antioxidant potential of polar extractives Picea abies bark from an industrial mill, their wood components also different fractions obtained by mechanical fractionation (fine B1, Φ<0.180 mm, medium B3, 0.450 < Φ<0.850 mm coarse B6, 2 Φ<10 mm). aim is to increase knowledge on better determine possible uses other than burning for energy production test initial size reduction process achieve with...
Abstract Cork and phloem from Pseudotsuga menziesii outer bark were separated, fractionated the 40- to 60-mesh fractions chemically analyzed. showed a different grinding behavior with highest yields for cork phloem, respectively, fraction (31.4%) <0.180-mm (49.2%). chemical composition was (% o.d. mass): ash 0.9%; extractives 29.2% (mostly polar, 23.5%); lignin 16.8%, suberin 36.2%. Polysaccharides (16.9%) contained glucose (55.4% of total neutral carbohydrates), xylose (13.3%), mannose,...