scholarly journals Caffeine Interactions with Wood Polymers

Forests ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 533
Author(s):  
Klára Kobetičová ◽  
Kristýna Ďurišová ◽  
Jana Nábělková
Keyword(s):  
Chemical Composition ◽  
Significant Role ◽  
Wood Species ◽  
Variable Binding ◽  
Sinapyl Alcohol ◽  
Wood Protection ◽  
Wood Polymer ◽  
Bioactive Substance

Caffeine is a verified bioactive substance suitable for wood protection against pests. Unlike studies of the biocidal effects of caffeine, caffeine-wood bonds and interactions with wood polymer structures have not been studied whatsoever thus far. For this reason, caffeine (1 g/L) interactions with the main wood components (cellulose; hemicellulose; lignin and its precursors conipheryl alcohol, sinapyl alcohol, coumaryl alcohol) were analyzed in the present study. Caffeine concentrations were analyzed using UV–VIS spectrometry at wavelength 287 nm. The results confirmed caffeine variable binding with wood components in comparison to controls (pure caffeine). Cellulose and sinapyl alcohol did not interact with caffeine. Caffeine was bonded with the rest of the wood components in an increasing rank: conipheryl alcohol = lignin < hemicellulose < coumaryl alcohol. These results have a significant role in the protection of wood depending on its chemical composition and the wood species.

Anti-termite and anti-fungal bio-sourced wood preservation ingredients from Dacryodes edulis (G. Don) H.J. Lam resin

Holzforschung ◽  
2020 ◽  
Vol 74 (8) ◽  
pp. 745-753
Author(s):  
Walter Fiacre Bédounguindzi ◽  
Kévin Candelier ◽  
Prosper Edou Engonga ◽  
Stéphane Dumarçay ◽  
Marie-France Thévenon ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Chemical Composition ◽  
Essential Oil ◽  
Heavy Fraction ◽  
Wood Preservation ◽  
Gas Chromatography Mass Spectrometry ◽  
Wood Protection ◽  
Anti Fungal ◽  
Dacryodes Edulis

AbstractDacryodes edulis (G. Don) H.J. Lam resin was hydro-distilled to recover essential oil (EO), and further purified to produce a heavy fraction constituting less volatile compounds. Chemical composition was investigated by gas chromatography-mass spectrometry (GC-MS), and indicated that different monoterpenes and triterpenes were present depending on the analyzed fraction. Bioassays were performed on the different fractions to evaluate their anti-fungal and anti-termite properties. Results indicated that crude resin, its heavy fraction and its EO all had proved termicidal properties, which decrease on drying for EO and crude resin due to evaporation of monoterpenes. Conversely, no anti-fungal properties were observed for any fraction. Dacryodes edulis resin is therefore a new valuable bioactive ingredient for the formulation of wood protection products with anti-termite properties.

scholarly journals Mechanical and Morphological Properties of Tropical Wood Polymer Nanocomposite (WPNC)

2013 ◽  
Vol 667 ◽  
pp. 200-205 ◽  
Author(s):  
Md. Saiful Islam ◽  
Sinin Hamdan ◽  
Mohamad Rusop ◽  
Md. Rezaur Rahman
Keyword(s):  
Polymer Nanocomposites ◽  
Wood Species ◽  
Phenol Formaldehyde ◽  
Polymer Nanocomposite ◽  
Xrd Analysis ◽  
Morphological Properties ◽  
Xrd Pattern ◽  
Tropical Wood ◽  
Sem Image ◽  
Wood Polymer

A novel route to wood modification by impregnation of nanoclay combined with phenol formaldehyde (PF) resin is developed in this study. Wood polymer nanocomposites (WPNCs) were prepared from several tropical wood species by impregnating the woods with PF/nanoclay formulations. The vacuum-pressure method was used to impregnate the samples with PF/nanoclay prepolymer mixture. The formation of wood polymer nanocomposites and the location of impregnated materials inside wood were confirmed through SEM image and XRD pattern respectively. The PF/nanoclay loading achievable was found to be dependent on the properties of wood species. Low loading was observed for the high density wood species. Mechanical strength of fabricated WPNCs in terms of modulus of elasticity (MOE) was found to be significantly improved. Furthermore, morphological properties of raw wood and WPNC samples were evaluated by scanning electron microscopy (SEM) and XRD analysis and a change in morphological properties was also observed for WPNC.

Chemical composition of particles from traditional burning of Pakistani wood species

2015 ◽  
Vol 121 ◽  
pp. 35-41 ◽  
Author(s):  
Imran Shahid ◽  
Magdalena Kistler ◽  
Azam Mukhtar ◽  
Carlos Ramirez-Santa Cruz ◽  
Heidi Bauer ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Wood Species

scholarly journals Preventing the Sale of Fraudulent Gemstones using Non-Destructive X-Ray Fluoresence Spectroscopy

2009 ◽  
Vol 17 (1) ◽  
pp. 52-55
Author(s):  
Mary S. Goldman ◽  
Dan L. Davis ◽  
Robert H. Clifford
Keyword(s):  
Chemical Composition ◽  
Significant Role ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
X Ray ◽  
Naked Eye ◽  
The World ◽  
Non Destructive ◽  
Ideal Technique ◽  
Xrf Spectroscopy

As the old adage goes, beauty is in the eye of the beholder. Ultimately, in the world of jewelry, the unwitting buyer uses his or her naked eye to decide which baubles are the most beautiful and worthy of wear. The expert jeweler and gemologist, however, know that each gem is subjected to rigorous scientific examinations and standards to determine its value and authenticity.As the number of methods for altering gems grows with technology, methods to counteract counterfeiters, who can take a worthless stone and alter it to make it appear like a more expensive gem, are essential to gem buyers and traders. They must be able to detect artificial stones.Gemologists assess gemstones based on several standards such as chemical composition and purity. Chemical composition plays a significant role in evaluating gems, as two of the same gemstone can differ chemically. One of the most well known methods of non-destructive testing for detecting gem quality is X-ray fluorescence (XRF) spectroscopy. Increasingly in demand, XRF spectroscopy is an ideal technique for fighting the battle against fraud.

scholarly journals BIOACTIVITY ANALYSIS OF Annona glabra L. SEED EXTRACTS FOR WOOD PROTECTION AGAINST TERMITES (Cryptotermes cynocephalus Light. AND Coptotermes curvignathus Holmgren.)

2021 ◽  
Vol 8 (2) ◽  
pp. 127-134
Author(s):  
Trisna Priadi ◽  
Nurul Chotimah ◽  
Agus Ismanto
Keyword(s):  
Ethyl Acetate ◽  
Subterranean Termites ◽  
Wood Protection ◽  
The Family ◽  
Seed Extraction ◽  
Bioactive Substance ◽  
Dry Wood ◽  
Annona Glabra ◽  
Paper Disc ◽  
Seed Extracts

Pond apple (Annona glabra L.) belongs to the family of Annonaceae. The seed of A. glabra contains bioactive substance that is toxic to some organisms, however the effectiveness to control wood degrading termites has not yet been scientifically reported.  This research analyzes the efficacy of A. glabra seed extract to wood degrading termites. Seed extraction was conducted using n-hexane and ethyl acetate. The paper disc test showed that the extract of A. glabra is toxic to Cryptotermes cynocephalus (dry-wood termites) and Coptotermes curvignathus (subterranean termites). The higher extract concentration (up to 63%) resulted in a higher termite mortality (up to 100%) and lower weight loss of paper sample (less than 1%).  Ethyl acetate extract of A. glabra seeds has a better toxicity effect than n-hexane extract against dry wood termites and subterranean termites.

Relationships between chemical composition and decay durability of Coula edulis Baill as an alternative wood species in Gabon

2020 ◽  
Vol 54 (2) ◽  
pp. 329-348
Author(s):  
C. S. A. Bopenga Bopenga ◽  
S. Dumarçay ◽  
P. Edou Engonga ◽  
P. Gérardin
Keyword(s):  
Chemical Composition ◽  
Wood Species

Chemical composition of traditionally and lesser used wood species from Mozambique

2010 ◽  
Vol 5 (3-4) ◽  
pp. 143-150 ◽  
Author(s):  
Inácio Lhate ◽  
Carlos Cuvilas ◽  
Nasko Terziev ◽  
Raida Jirjis
Keyword(s):  
Chemical Composition ◽  
Wood Species
Sign in / Sign up

Export Citation Format

Share Document