Changing in Larch Sapwood Extractives Due to Distinct Ionizing Radiation Sources

Abstract

Wood extractives have an influence on different material properties. This study deals with the changes in wood extractives of larch sapwood due to two different low doses of energy irradiations. Electron beam irradiation (EBI) and γ-ray irradiation treatments were done by using two industrial processes. After the different modifications the extractions were performed with an accelerated solvent extractor (ASE) using hexane and acetone/water. The qualitative and quantitative chemical differences of irradiated larch sapwood samples were analysed using gas chromatography–mass spectrometry (GC-MS) and Fourier-transform infrared spectroscopy (FT-IR) vibrational spectroscopy methods. The yields of the quantitative extractions decreased due to the two different irradiation processes. While the compounds extracted with nonpolar solvent from wood were reduced, the number of compounds with polar functionalities increased based on the oxidation process. Quantitatively, resin acids and polyphenols were highly affected when exposed to the two irradiation sources, leading to significant changes (up, down) in their relative amount. Furthermore, two new substances were found in the extracts of larch sapwood samples after EBI or γ-ray treatments. New insight into the different effects of larch sapwood and wood extractives by EBI and γ-ray was gained in this study.

Removal of wood extractives as pulp (pre-)treatment: a technological review

“…Wagner et al [61] successfully applied Fourier-transform RAMAN spectroscopy (FT-RAMAN), Fourier-transform infrared spectroscopy (FT-IR), and Fourier-transform near-infrared spectroscopy (FT-NIR) for this purpose. Similar qualitative analyses were carried out by Schnabel et al [62] with FT-NIR for larch wood. However, spectroscopy methods are still not the right choice for quantifying wood extractives and require further research [61][62][63].…”

“…Similar qualitative analyses were carried out by Schnabel et al [62] with FT-NIR for larch wood. However, spectroscopy methods are still not the right choice for quantifying wood extractives and require further research [61][62][63].…”

Method for determining the mass conductivity coefficient of wood when extracting biologically active substances from it

“…The high therapeutic properties of biologically active substances contained in various types of wood cause a wide interest of researchers in the technological processes of their extraction or extraction processes [1][2][3].…”

“…A rich source of nutrients is larch wood, which grows in large quantities on the territory of the Russian Federation. Dihydroquercetin (DHQ) and arabinogalactan (AG) contained in it are powerful antioxidants with capillary-protective, anti-inflammatory, and antihistamine properties [12][13][14].…”