Related Experiment Video
Updated: Jul 10, 2026
06:56
Tree Core Analysis with X-ray Computed Tomography
Published on: September 22, 2023
Spectral characterization of eucalyptus wood
Carmen-Mihaela Popescu1, Maria-Cristina Popescu, Ghita Singurel
1Romanian Academy P. Poni Institute of Macromolecular Chemistry, 41A Gr. Ghica Voda Alley, Ro.700487, IASI, Romania. mihapop@imcpp.ro
Applied Spectroscopy
|November 22, 2007
Summary
Fourier transform infrared (FT-IR) spectroscopy and X-ray diffraction effectively differentiate Eucalyptus globulus wood and pulp. These methods analyze spectral characteristics and crystallinity, confirming FT-IR
Area of Science:
- Wood and Pulp Science
- Analytical Chemistry
- Materials Science
Background:
- Wood and pulp analysis is challenging due to complex chemical structures and the intimate association of lignin with carbohydrates.
- Selective separation of components like lignin and carbohydrates is crucial for accurate analysis.
- Wood processing, including pulping and bleaching, alters the structure of its components.
Purpose of the Study:
- To apply Fourier transform infrared (FT-IR) spectrometry and X-ray diffraction for analyzing Eucalyptus globulus wood chips and pulp.
- To establish relationships between spectral characteristics and sample composition.
- To evaluate structural modifications during pulping and bleaching processes.
Main Methods:
- Fourier transform infrared (FT-IR) spectrometry was used to analyze wood and pulp samples.
- X-ray diffraction was employed to assess the degree of crystallinity.
- Samples were fractionated by successive extraction (acetone extractives, hemicelluloses, lignins) for detailed analysis.
Main Results:
- FT-IR spectra revealed differences in lignin/carbohydrate ratios between wood chips and pulp, with higher ratios in chips.
- Chlorite bleaching was shown to partially modify or remove wood components.
- X-ray diffraction confirmed lower lignin content in pulp samples through increased crystalline parameters.
Conclusions:
- FT-IR spectroscopy is a rapid and effective method for distinguishing between Eucalyptus globulus wood and pulp samples.
- The combination of FT-IR and X-ray diffraction provides insights into structural changes during wood processing.
- Spectral analysis can quantify lignin content and assess structural integrity in wood-derived materials.
More Related Videos
11:31High-throughput Screening of Recalcitrance Variations in Lignocellulosic Biomass: Total Lignin, Lignin Monomers, and Enzymatic Sugar Release
Published on: September 15, 2015
07:51Combining Raman Imaging and Multivariate Analysis to Visualize Lignin, Cellulose, and Hemicellulose in the Plant Cell Wall
Published on: June 10, 2017
Related Concept Videos
01:29UV–Vis Spectroscopy: Woodward–Fieser Rules
UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given structure by adding the contributions...
01:28Softwoods and Hardwoods
Softwoods and hardwoods, derived from different types of trees, are distinguished by their leaf structures and cellular compositions, each serving unique purposes in construction and manufacturing. Softwoods come from cone-bearing trees with needle-like leaves and are predominantly composed of longitudinal cells called tracheids and a smaller proportion of radial cells known as rays. Due to their cellular structure, softwoods are commonly used in construction for structural frames, sheathing,...
01:16Spectrophotometry: Introduction
Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material.
The essential components of a spectrophotometer include a source of electromagnetic radiation, a slot for placing a material to be analyzed, and a...
The essential components of a spectrophotometer include a source of electromagnetic radiation, a slot for placing a material to be analyzed, and a...
01:08IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations
Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single stretching vibration...
01:16UV–Vis Spectroscopy: Molecular Electronic Transitions
In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this process,...
01:19Introduction to Wood
Wood, derived from trees, is a versatile and widely used construction material. Trees feature a trunk surrounded by a protective layer of dead bark. Beneath this outer layer lies the living bark, followed by the cambium, and then the sapwood which transitions into heartwood as it matures. At the center of the trunk is the pith. The age of a tree can be discerned by examining its growth rings, which are concentric bands visible in the trunk's cross-section.
The structural integrity of the wood...
The structural integrity of the wood...