Holzforschung最新文献_第2页

A comparative study of the cell wall level delignification behaviour of four Nordic hardwoods during kraft pulping 牛皮纸制浆过程中四种北欧硬木细胞壁层脱木质素行为的比较研究

IF 2.4 3区农林科学

Holzforschung Pub Date : 2024-06-25 DOI: 10.1515/hf-2024-0011

Linus Kron, Merima Hasani, Hans Theliander

{"title":"A comparative study of the cell wall level delignification behaviour of four Nordic hardwoods during kraft pulping","authors":"Linus Kron, Merima Hasani, Hans Theliander","doi":"10.1515/hf-2024-0011","DOIUrl":"https://doi.org/10.1515/hf-2024-0011","url":null,"abstract":"Wood is a heterogeneous material with significant variation among species. This inherent complexity poses a challenge to the continuous expansion of our understanding of the kraft process; yet previous pulping research has mainly been limited to a few species. This study investigates variations among some less studied species and their cell wall level delignification behaviour during kraft pulping. Ground wood of birch, beech, aspen, and alder were pulped at near-constant composition and temperature conditions. Minor, yet significant, differences in the rates of their delignification were observed: aspen had a pronounced fast rate during the initial stage, whereas alder delignified more slowly relative to its high initial lignin content. The dissolution of xylan was substantially faster for birch. In contrast, no substantial differences were detected between the species in the molecular weight and structure of the dissolved wood components, suggesting that the different delignification behaviours stem from variations in the residual phase. The molecular weight distribution of dissolved lignin was uniform during the initial stage of pulping, which is indicative of rapid and extensive fragmentation. Subsequently, the weight increased continuously for the remainder of the process, suggesting that the mass transfer within the cell wall influenced the overall delignification kinetics.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":"7 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141529512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Determination of lignin composition in compression wood-like reaction wood of angiosperm Gardenia jasminoides by pyrolysis–gas chromatography–mass spectrometry 利用热解-气相色谱-质谱法测定被子植物栀子的压缩类反应木中的木质素成分

IF 2.4 3区农林科学

Holzforschung Pub Date : 2024-05-08 DOI: 10.1515/hf-2023-0123

Haruna Aiso, Tatsuya Ashitani, Futoshi Ishiguri

引用次数: 0

Hydrothermal enzyme pretreatment on structure and properties of apple branches 水热酶预处理对苹果枝条结构和特性的影响

IF 2.4 3区农林科学

Holzforschung Pub Date : 2024-05-06 DOI: 10.1515/hf-2023-0103

Jieying Yuan, Yibo Li, Shulei Li, Zheyun Liu, Yunjing Lu, Shuoyu Dang, Fan Ding, Ruijin Yu, Jie Chu

{"title":"Hydrothermal enzyme pretreatment on structure and properties of apple branches","authors":"Jieying Yuan, Yibo Li, Shulei Li, Zheyun Liu, Yunjing Lu, Shuoyu Dang, Fan Ding, Ruijin Yu, Jie Chu","doi":"10.1515/hf-2023-0103","DOIUrl":"https://doi.org/10.1515/hf-2023-0103","url":null,"abstract":"Pretreatment serves as an important step in maximizing the efficient utilization of woody biomass feedstock. This study focused on enhancing the component and structural properties of apple wood to optimize the utilization of apple wood resources effectively. This study presents the optimization of, the apple wood pretreatment system, combining bioenzyme and hydrothermal treatments. This study aimed to investigate the effect of different bioenzyme pretreatment conditions on the components and structural properties of apple wood extract and to analyze the feasibility of enzyme solution reuse. Fourier transform infrared spectroscopy analysis revealed an increase in cellulose content in the wood flour following enzyme treatment. Concurrently, changes in characteristic peaks indicated an increased hemicellulose content and a reduction in lignin content after the pretreatment, correlating with fraction analysis results. Scanning electron microscopy illustrated that the dense structure of the fiber surface was disrupted after treatment. Notably, the results indicated that the recovered biocomposite enzymes exhibited excellent activity, suggesting their potential for reuse.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":"41 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140887845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cell wall composition of Camellia oleifera Abel. shell: new insights into its composition distribution and ultrastructure 油茶（Camellia oleifera Abel.

IF 2.4 3区农林科学

Holzforschung Pub Date : 2024-05-06 DOI: 10.1515/hf-2023-0120

Jiawei Huang, Xiuyi Lin, Weiwei Zhang, Litao Guan, Jiangtao Xu, Jin Gu, Yonghui Zhou, Chuanshuang Hu

{"title":"Cell wall composition of Camellia oleifera Abel. shell: new insights into its composition distribution and ultrastructure","authors":"Jiawei Huang, Xiuyi Lin, Weiwei Zhang, Litao Guan, Jiangtao Xu, Jin Gu, Yonghui Zhou, Chuanshuang Hu","doi":"10.1515/hf-2023-0120","DOIUrl":"https://doi.org/10.1515/hf-2023-0120","url":null,"abstract":"Camellia oleifera Abel. shell (COS) is an agricultural waste in quantities exceeding a million tons annually. The ultrastructure of the COS cell wall and the distribution of lignocellulose components were investigated. The microscopic results showed that COS contains two types of cells, sclerenchyma cells (SC) and parenchyma cells (PC). SC contained 50.4 % hemicellulose, 17.6 % cellulose and 30.9 % lignin while PC contained 35.2 % hemicellulose, 23.7 % cellulose and 35.0 % lignin. The distribution of lignocellulose components in COS is non-homogeneous. Lignin is alternately distributed with polysaccharides in the PC wall. In SC, hemicellulose is mainly present in the secondary wall S2, while lignin was mainly found in the compound middle lamella, and cellulose mainly exists in the secondary wall, S3. A comprehensive model of the cell wall ultrastructure and lignocellulose distribution of COS was given. This study provides a fundamental understanding of COS cell walls and can aid in the future graded utilization of COS.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":"2013 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140887778","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dynamic diffusion in softwood and hardwood cell walls using fluorescence recovery after photobleaching 利用光漂白后的荧光恢复技术研究软木和硬木细胞壁的动态扩散情况

IF 2.4 3区农林科学

Holzforschung Pub Date : 2024-04-21 DOI: 10.1515/hf-2024-0007

Lloyd Donaldson, Hamish Pearson

{"title":"Dynamic diffusion in softwood and hardwood cell walls using fluorescence recovery after photobleaching","authors":"Lloyd Donaldson, Hamish Pearson","doi":"10.1515/hf-2024-0007","DOIUrl":"https://doi.org/10.1515/hf-2024-0007","url":null,"abstract":"The porosity of cell walls, as indicated by diffusion of rhodamine B dye, in the wood of Douglas fir, radiata pine, New Zealand red beech and Shining gum was compared under dynamic conditions using fluorescence recovery after photobleaching. The comparative diffusion rate was estimated using the half-life of fluorescence recovery under water-saturated conditions performed on transverse sections. All four wood species showed similar diffusion behaviour in tracheid or fibre cell walls with slower diffusion in the middle lamella layer compared to the secondary cell wall. Within the S2 layer of the secondary wall two regions were observed, an outer region with a slow diffusion rate and an inner region with a higher diffusion rate. Vessel cell walls showed slightly slower diffusion rates. Diffusion of rhodamine B dye appears to occur primarily along the fibre axis and is probably somewhat different to water in its behaviour. This suggests that pores are aligned with cellulose microfibrils. The dye diffusion rate was estimated to be in the range of 50–100 nm2 s−1. This has implications for understanding wood drying behaviour and chemical modification of wood by infiltration with small molecules as well as water storage in living trees.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":"100 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140630180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact of surface delignification on fire retardancy of wood treated with polyelectrolyte complexes 表面脱木素对用聚电解质复合物处理的木材阻燃性的影响

IF 2.4 3区农林科学

Holzforschung Pub Date : 2024-03-27 DOI: 10.1515/hf-2023-0059

Marie Soula, Fabienne Samyn, Sophie Duquesne, Véronic Landry

{"title":"Impact of surface delignification on fire retardancy of wood treated with polyelectrolyte complexes","authors":"Marie Soula, Fabienne Samyn, Sophie Duquesne, Véronic Landry","doi":"10.1515/hf-2023-0059","DOIUrl":"https://doi.org/10.1515/hf-2023-0059","url":null,"abstract":"Wood is a natural composite widely employed as a residential building interior finishing. Although wood is readily available and offers benefits to the occupants, such as enhanced well-being, it is rarely employed in commercial construction due, amongst others, to the potential hazard of fire propagation. The application of flame retardant (FR) treatments leads to a reduction of wood flammability and supports wood as interior finishing. Polyelectrolyte complexes (PECs) deposition is an innovative surface treatment that has already proven its efficiency for fabrics. For wood, recent studies have highlighted that the weight gain impacted the fire-retardancy, and a minimum of 2 wt.-% was set to obtain fire protection. This study explored the potential of surface delignification to activate the wood surface and facilitate the PEC impregnation. Yellow birch (Betula alleghaniensis, Britt.) was surface delignified (0.3 mm) using sodium chlorite. The treatment impact on wood was evaluated by spectroscopy analysis (FTIR, Raman), and the increase in wood wettability was demonstrated (contact angle decreases from 50° to 35° after the surface delignification). Then, PECs consisting of polyethyleneimine and sodium phytate were surface impregnated in wood and delignified wood. The flame retardancy was evaluated using a cone calorimeter. Despite the increase in weight gain (1.5 wt.-% ± 0.3 wt.-% to 4.3 wt.-% ± 2.5 wt.-%), fire performance was not improved. This study demonstrates that lignin strongly affects char formation, even in the presence of PECs.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":"30 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140315856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A study of dimensional effects on the stress characteristics of Yunnan pine shafts considering seismic strain rates 考虑地震应变率的云南松竖井应力特性的尺寸效应研究

IF 2.4 3区农林科学

Holzforschung Pub Date : 2024-03-25 DOI: 10.1515/hf-2023-0098

Jianhui Liu, Guolin Xu, Yashuang Bai, Yujie Lin, Wenqing Geng

{"title":"A study of dimensional effects on the stress characteristics of Yunnan pine shafts considering seismic strain rates","authors":"Jianhui Liu, Guolin Xu, Yashuang Bai, Yujie Lin, Wenqing Geng","doi":"10.1515/hf-2023-0098","DOIUrl":"https://doi.org/10.1515/hf-2023-0098","url":null,"abstract":"The mechanical properties of wood are affected by member size and loading rate. Axial compression tests with different seismic strain rates and sizes of specimens were carried out to investigate the static and dynamic dimensional effects of Yunnan pine timber. And obtained load-displacement curves, compressive strength, modulus of elasticity, peak strain and Poisson’s ratio. Weibull’s weakest chain theory, Bazant’s law of dimensional effects and Carpinteri’s law of multiple fractal dimensional effects were used to analyze the dimensional effects on the compressive strength of wood, and to establish a wood strength model that takes strain rate effects and dimensional effects into account. The results showed that the compressive strength, elastic modulus, and Poisson’s ratio of Yunnan pine wood exhibit both size and strain rate effects. Under the coupling effect of strain rate effect and size effect, the size effect of Yunnan pine wood strength decreases with increasing strain rate, while the strain rate effect increases with increasing size. A size effect model for compressive strength of wood considering strain rate effect based on three theories and experimental data can well describe the dynamic size effect of Yunnan pine wood strength.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":"13 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140303331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Poplar wood treated with nano-silver–copper particles: fungal degradation and leaching analysis 用纳米银铜颗粒处理的杨木：真菌降解和沥滤分析

IF 2.4 3区农林科学

Holzforschung Pub Date : 2024-03-25 DOI: 10.1515/hf-2023-0128

Xiwei Wang, Tengfei Yi, Hongxue Luo, Yanran Qi, Fengbiao Yao, Yiliang Liu, Yongfeng Li

{"title":"Poplar wood treated with nano-silver–copper particles: fungal degradation and leaching analysis","authors":"Xiwei Wang, Tengfei Yi, Hongxue Luo, Yanran Qi, Fengbiao Yao, Yiliang Liu, Yongfeng Li","doi":"10.1515/hf-2023-0128","DOIUrl":"https://doi.org/10.1515/hf-2023-0128","url":null,"abstract":"This study investigated the inhibition effect of nanoscale silver–copper particle (20 nm) against Coriolus versicolor and Gloeophyllum trabeum. Poplar wood samples (Populus L.) were vacuum-impregnated using aqueous nano-AgCu solutions at concentrations of 0.01 %, 0.02 %, 0.03 %, 0.05 %, 0.075 %, and 0.1 %. Alkaline copper quaternary (ACQ, 0.1 %), boric acid (0.2 %) and untreated control group (CK) were employed for comparisons. Decay resistance and leachability were studied. The anti-fungi effects were compared between nano-AgCu, nano-Ag, Ag+ (silver nitrate), Cu2+ (copper nitrate), and a composite of Ag+–Cu2+. Nano-AgCu particle exhibited effective resistance to fungi after 12 weeks of exposure. The threshold retention of the nano-AgCu against C. versicolor and G. trabeum on poplar wood was 0.19 kg m−3 and 0.62 kg m−3, respectively. The silver–copper nanoparticles demonstrated excellent leach resistance, and the inhibition effect was retained after leaching. The nano-AgCu particle provided better antifungal effects than single ions or metal nanoparticles. This study illustrates the potential of using nano-AgCu particle as an efficient wood preservative compared to commercial water-soluble preservatives.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":"30 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140301534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Photodegradation stability of huminated European pine (Pinus sylvestris L.) microveneers 腐殖化欧洲松树（Pinus sylvestris L.）微文素的光降解稳定性

IF 2.4 3区农林科学

Holzforschung Pub Date : 2024-03-19 DOI: 10.1515/hf-2024-0006

Amir Ghavidel, Reza Hosseinpourpia

{"title":"Photodegradation stability of huminated European pine (Pinus sylvestris L.) microveneers","authors":"Amir Ghavidel, Reza Hosseinpourpia","doi":"10.1515/hf-2024-0006","DOIUrl":"https://doi.org/10.1515/hf-2024-0006","url":null,"abstract":"Humins are heterogeneous and polydisperse furanic macromolecules derived from sugar biorefinery. Improving wood properties by humination has become of interest recently. This study examined the photodegradation stability of European pine sapwood microveneers modified with humins at different concentrations of citric acid (CA) and succinic acid (SA) as reaction catalysts, e.g., 1.5 %, 3 %, and 4.5 % wt.%. The photostability of huminated wood was assessed after 48 h, 96 h, and 144 h of exposure to the accelerated weathering test by means of mass loss and finite-span tensile strength. The results were compared with unmodified and also unweathered samples. The FT-IR spectroscopy showed apparent changes in the chemical structure of wood by humination modifications. The weight percentage gains of the samples increased with increasing the concentration of the catalyst. While no differences were observed between the samples after two weeks of the water leaching. The strength losses of weathered microveneers were, however, mostly reduced by humin-based formulas containing catalysts, where the microveneers modified with 1.5 % and 3 % CA showed respectively 32 % and 41 % lower strength loss values than the unmodified samples after 144 h of weathering. Overall, the results showed a high potential for humins to protect wood against photodegradation.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":"36 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140171060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Douglas fir bark: composition, extracts utilization and enzymatic treatment for enrichment of bioactive constituents 花旗松树皮：成分、提取物利用和酶处理以丰富生物活性成分

IF 2.4 3区农林科学

Holzforschung Pub Date : 2024-03-11 DOI: 10.1515/hf-2023-0130

Lukas Sommerauer, Matthew Konkler, Gerald Presley, Thomas Schnabel, Alexander Petutschnigg, Barbara Hinterstoisser

{"title":"Douglas fir bark: composition, extracts utilization and enzymatic treatment for enrichment of bioactive constituents","authors":"Lukas Sommerauer, Matthew Konkler, Gerald Presley, Thomas Schnabel, Alexander Petutschnigg, Barbara Hinterstoisser","doi":"10.1515/hf-2023-0130","DOIUrl":"https://doi.org/10.1515/hf-2023-0130","url":null,"abstract":"Bark residues from Douglas fir are an abundant resource that is currently used primarily in low-value energy recovery or is landfilled. Bark extractives are rich in diverse compounds like terpenes, fatty acids, phenols, and sugars with potential uses in a variety of high value applications. The study explores the potential of enzymatic hydrolysis to improve phenolic compounds from Douglas fir bark. It also assesses differences in chemical composition among rhytidome, phloem, and comingled bark fractions from an industrial waste pile. Phloem fractions exhibit higher yields of extractives, rhytidome fractions have elevated lignin levels, while the comingled fraction lies between the two except in ash content which was higher than in the separated fractions. Fungal decay tests with Gloeophyllum trabeum and Coniophora puteana on extract treated wood suggest potential for growth inhibition in extracts, about 58–31 % and 30–7% mass loss (in average) respectively, but due to high mass loss at low concentrations an enzymatic modification approach seems crucial for enhanced inhibition. Growth responses in whole-cell fermentation approach display variability depending on the participating microorganisms. Enzymatic hydrolysis with beta-glucosidase improved the antioxidant properties of bark extracts and holds promise for altering the chemical composition and enhancing bioactivity.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":"17 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140108179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0