Li Yan,Feiyang Zeng,Zhangjing Chen,Shuang Chen,Yafang Lei
Wood is an environmentally friendly product , but some of woods can be easily biodegraded. Salicylic acid/silica microcapsules (SSM) represents a kind of wood preservative prepared with the anti-fungal salicylic acid as a core substance and the silica as wall material using sol-gel technology . SSMs were synthesized and then impregnated into poplar wood using vacuum-pressure treatment. Leaching tests were carried out in distilled water for up to 318 h. Decay resistance of SSM treated poplar against white-rot fungi ( Trametes versicolor ) and brown rot fungi ( Gloeophyllum trabeum ) was determined. Leaching tests showed that SSM retention was good and leaching resistance of salicylic acid in SSM treated wood were improved. SEM (scanning electron microscope), FTIR (Fourier-transform infrared spectroscopy), EDX (Energy Dispersive X-Ray Spectroscopy) and XPS (X-ray photoelectron spectroscopy) analysis showed that the SSMs were between 0.06 and 0.16 μm, and most were distributed in the vessel cavity with hydrogen bonding to cell wall surfaces, some SSMs were found in the cell wall. The decay resistance of SSM treated poplar was greatly improved compared to untreated poplar.
Zhenju Bi,Jeffrey J. Morrell,Yafang Lei,Li Yan,Meitong Ji
Wood protection using plant-derived extracts has shown some promise but the extracts are often easily leached making them less attractive for long-term wood protection. The potential of extracts from heat treated wood sawdust as a natural substitute for wood preservatives was explored, and a mild enzyme-catalyzed method was used to improve its leaching resistance. Laccase was used to catalyze grafting reactions of extracts from heat treated spruce ( Picea asperata Mast.) and larch ( Larix gmelinii (Rupr.) Kuzen.). The resulting extracts were screened for antifungal activity and then impregnated into poplar blocks ( Populus tomentosa Carr.). Fourier Transform Infrared Spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) were used to characterize extracts reactions. Gas chromatography-mass spectrometry (GC-MS) was used to analyze the grafted compounds. Acetone extracts from both heat treated spruce and larch exhibited good activity against the test fungi. Heat treated spruce and larch acetone extracts grafted on modified poplar and subjected to leaching showed better activity against the white-rot fungus, Trametes versicolor (L. ex Fr.) Quél. than the brown-rot fungus, Gloeophyllum trabeum (Pers.: Fr.) Murr. FTIR and XPS results indicated that heat-treated spruce and larch extracts were grafted on poplar by laccase catalysis. Squalene, 3-hydroxy-4-methoxybenzoic acid, and n-hexadecanoic acid were among those compounds suggested to be grafted. The results suggest that laccase-mediated pre-treatment of plant extracts has the potential to increase resistance to leaching. Trials with additional plant-extracts are recommended.
Lignocellulosic biorefineries depended on effective pretreatment strategies to improve the conversion efficiency of the enzymatic hydrolysis. Here, this study coupled brown rot fungi and deep eutectic solvent (DES) to pretreat Pinus massoniana . The results showed that compared to fungal pretreatment and DES pretreatment alone, the combined ChCl-Lac/fungal pretreatments could effectively improve enzymatic saccharification of Pinus massoniana . The highest content of releasing reducing sugar reached 510.3 mg/g substrate. Environmental scanning electron micrograph (ESEM) showed that the surface structure of Pinus massoniana was almost completely torn and loose and FT-IR spectra and component analysis revealed that most of hemicellulose and lignin were selected removed and cellulose was enriched after ChCl-Lac/fungal pretreatments, which could account for the enhanced hydrolysis efficiency. The combination of biological pretreatment with DES pretreatment could be a mild and promising pretreatment approach for enzymatic saccharification of lignocellulose and had an extensive application prospect in the field of biorefinery.
Xinqi Gao,Yafang Lei,Teng Sun,Yuanze Ma,Hao Guan,Li Yan
Enhancing the decay resistance ofPopulus tomentosawood through environmentally friendly methods is crucial for improving its durability and market competitiveness. Lignified twigs (LT), typically unsuitable as timber due to their small diameter, are rich in lignin, which degrades during thermal induction to produce antifungal organic compounds. In this context, the objective of this study was to develop a lignified twig preservative (LTP) by thermal induction from the LT ofActinidia chinensisvar.Jinyang. The antifungal activity of LTP under varying thermal conditions was analyzed, along with its chemical composition. Enzyme activity, cell membrane integrity, and respiratory metabolism in fungi treated with LTP were examined to elucidate antifungal mechanisms. Additionally, the decay resistance of LTP-treated wood was evaluated. Results revealed that LTP produced under N2at 220 °C exhibited robust antifungal activity againstTrametes versicolorandGloeophyllum trabeum, attributed to phenolic compounds such as syringaldehyde, syringone, vanillin, and vanillone. LTP inhibited fungal cellulases, hemicellulases, and ligninases by 30%–60%, disrupted cell membrane functionality, and suppressed respiratory metabolism. Poplar wood treated with LTP demonstrated significantly enhanced decay resistance (mass loss < 10%). This thermal-induced feedback pattern shows great potential for LT in wood preservation.
危险品化学品经营许可证（带存储）