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Antioxidant activity of Swietenia macrophylla king bark extracts 大叶甜菊树皮提取物的抗氧化活性研究
IF 1.3 4区 农林科学
Wood Research Pub Date : 2021-03-08 DOI: 10.37763/WR.1336-4561/66.1.5770
Masendra Masendra, Brandon Aristo, Verick Purba, G. Lukmandaru, B. A. V. Purba
{"title":"Antioxidant activity of Swietenia macrophylla king bark extracts","authors":"Masendra Masendra, Brandon Aristo, Verick Purba, G. Lukmandaru, B. A. V. Purba","doi":"10.37763/WR.1336-4561/66.1.5770","DOIUrl":"https://doi.org/10.37763/WR.1336-4561/66.1.5770","url":null,"abstract":"This study investigated the antioxidant activity from the methanol (MeOH) soluble extract of the inner and outer bark of Swietenia macrophylla. The MeOH soluble extracts were fractionated into ethyl acetate (EtOAc) soluble and insoluble. The antioxidant activity was conducted by DPPH (1,1-diphenyl-2-picrylhydrazyl) method and the phenolic compounds were detected by GC-MS. The levels of total phenolic content of soluble and insoluble fraction of EtOAc of outer bark were higher than in inner bark, while total f lavonoid content showed opposite results. The crude methanol extract and its EtOAc soluble fraction of outer bark showed a higher level of antioxidant activity. The GC-MS analysis detected higher levels of fatty acids and alcohols of 87.12% than phenolic compounds of 12.17% in the inner bark, while the outer bark showed the opposite pattern with phenolic compounds of 82.65% than fatty acids of 8.43%. A strong correlation was demonstrated between total phenolic content and antioxidant activity.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":"66 1","pages":"57-70"},"PeriodicalIF":1.3,"publicationDate":"2021-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47598606","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 2
Wood species identification based on an ensemble of deep convolution neural networks. 基于深度卷积神经网络集合的树种识别。
IF 1.3 4区 农林科学
Wood Research Pub Date : 2021-03-08 DOI: 10.37763/66.1.0114
Tao He, Shibiao Mu, Houkui Zhou, Junguo Hu
{"title":"Wood species identification based on an ensemble of deep convolution neural networks.","authors":"Tao He, Shibiao Mu, Houkui Zhou, Junguo Hu","doi":"10.37763/66.1.0114","DOIUrl":"https://doi.org/10.37763/66.1.0114","url":null,"abstract":"Our paper proposed an ensemble framework of combining three deep convolution neural networks (CNN). This method was inspired by network in network. Transfer learning used to accelerate training and deeper layers of network. Nine different CNN architectures were trained and evaluated in two wood macroscopic images datasets. After two times of 30 epochs training, our proposed network obtained 100% test rate in our dataset, which including 8 kinds of wood species and 918 images. The proposed method achieved 98.81% test recognition rate after three times training with 30 epochs in other dataset, which including 41 kinds of wood species and 11,984 images. Results showed that magnification macroscopic images can be instead of microscopic images in wood species identification, and our proposed ensemble of deep CNN can be used for wood species identification.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":"66 1","pages":"01-14"},"PeriodicalIF":1.3,"publicationDate":"2021-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41364806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 2
Wood properties comparation of Cedrela odorata from trees in agroforestry and in pure plantation 农林业和纯人工林中香柏木的木材特性比较
IF 1.3 4区 农林科学
Wood Research Pub Date : 2021-03-08 DOI: 10.37763/WR.1336-4561/66.1.117128
Beatriz Segura-Elizondo, R. Moya
{"title":"Wood properties comparation of Cedrela odorata from trees in agroforestry and in pure plantation","authors":"Beatriz Segura-Elizondo, R. Moya","doi":"10.37763/WR.1336-4561/66.1.117128","DOIUrl":"https://doi.org/10.37763/WR.1336-4561/66.1.117128","url":null,"abstract":"The aim of this work was to compare the general, physical, mechanical, chemical and energy properties of the wood from Cedrela odorata trees growing in two agroforestry condition (tree-agroforestry) with Theobroma cacao (9 and 10 years old), with a ten-year-old C. odorata tree growing in pure plantation (tree-plantation). The results showed that there growing in agroforestry presented higher heartwood diameter (6.7 to 7.6 cm) and heartwood (approx. 17%) and lower bark (12-13%) and sapwood (69-70%) percentages than trees in pure plantation. In addition, this tendency was observed through different heights of the tree. Moreover, wood from 9-tree-agroforestry presented highest specific gravity and volume shrinkage. Then wood from this growing condition presented highest strength in axial hardness and flexure relative, and extractives in cold water and ethanol-toluene. No differences were observed between the energy properties. In general, wood from trees in agroforestry present better properties than the trees growing in pure plantation. According with these results, the potential of agroforestry systems relative to pure plantations, as regards to differences in tree growth produced by crop fertilization, pruning and other management measures to which the agricultural crop is subjected, which can give the wood qualities different from those found at earlier ages.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":"66 1","pages":"117-128"},"PeriodicalIF":1.3,"publicationDate":"2021-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45187282","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Effect of hot pressing modification on surface properties of rubberwood (Hevea brasiliensis) 热压改性对橡胶木表面性能的影响
IF 1.3 4区 农林科学
Wood Research Pub Date : 2021-03-08 DOI: 10.37763/WR.1336-4561/66.1.129140
Zhipeng Zhu, Dengyun Tu, Ziwei Chen, Chen Chuanfu, Qiangfang Zhou
{"title":"Effect of hot pressing modification on surface properties of rubberwood (Hevea brasiliensis)","authors":"Zhipeng Zhu, Dengyun Tu, Ziwei Chen, Chen Chuanfu, Qiangfang Zhou","doi":"10.37763/WR.1336-4561/66.1.129140","DOIUrl":"https://doi.org/10.37763/WR.1336-4561/66.1.129140","url":null,"abstract":"This research aims to investigate the effect of thermal modification by hot pressing on surface characteristics of rubberwood. For this purpose, rubberwood specimens were thermally modified by hot pressing in an open system at three different temperatures (170, 185, and 200°C) for two different durations (1.5 or 3 h). Based on the results, the values of chromatic aberration (ΔE), contact angle and glossiness increased, and roughness decreased with increasing temperature and enlarging duration further. Although the contact angle had increased, it was still less than 90°. This aesthetic surface of rubberwood could be retained by using transparent organic coatings. The thermally modified rubberwood with excellent performance could be used as a material for solid wood flooring, wallboard, and furniture applications.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":"66 1","pages":"129-140"},"PeriodicalIF":1.3,"publicationDate":"2021-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45188275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 3
Thermogravimetric analysis, differential scanning calorimetry and time-to-ignition of wood materials treated with water glass flame retardants 用水玻璃阻燃剂处理的木质材料的热重分析、差示扫描量热法和点火时间
IF 1.3 4区 农林科学
Wood Research Pub Date : 2021-03-08 DOI: 10.37763/WR.1336-4561/66.1.1526
Juraj Jancík, L. Osvaldová, F. Markert
{"title":"Thermogravimetric analysis, differential scanning calorimetry and time-to-ignition of wood materials treated with water glass flame retardants","authors":"Juraj Jancík, L. Osvaldová, F. Markert","doi":"10.37763/WR.1336-4561/66.1.1526","DOIUrl":"https://doi.org/10.37763/WR.1336-4561/66.1.1526","url":null,"abstract":"The paper investigates efficiency of silicate f lame retardants on wooden fibres (used for production of medium-density fibreboards) and spruce boards. A simultaneous thermal analysis and cone calorimetry were used for the assessment. Specimens were treated with three different types of silicate water glass: sodium silicate, potassium silicate and modified silicate. Along with these, one sample of untreated fibres was tested in order to provide a baseline sample. As a result of the simultaneous thermal analysis, the ability of the treatments to increase the residual amount of biological char in samples during pyrolysis and ability of the f lame retardant to be retained in these wood fibres was used to assess the efficiency of each flame retardant on the wood fibres.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":"66 1","pages":"15-26"},"PeriodicalIF":1.3,"publicationDate":"2021-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44303684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 1
Synthesis and characterization of resol type phenol-formaldehyde resin improved by SiO2-Np SiO2-Np改性甲阶酚醛树脂的合成与表征
IF 1.3 4区 农林科学
Wood Research Pub Date : 2021-03-08 DOI: 10.37763/WR.1336-4561/66.1.161169
G. Özbay, Erkan Sami Kokten, A. Özçifçi
{"title":"Synthesis and characterization of resol type phenol-formaldehyde resin improved by SiO2-Np","authors":"G. Özbay, Erkan Sami Kokten, A. Özçifçi","doi":"10.37763/WR.1336-4561/66.1.161169","DOIUrl":"https://doi.org/10.37763/WR.1336-4561/66.1.161169","url":null,"abstract":"In this work, resol type phenol–formaldehyde (RPF) resin was modified with silicon dioxide nanoparticles (SiO2-Np). SiO2-Np was added at varying ratios from 1 to 4 wt.% to improve the bonding performance of the RPF resins. The physical characteristics of the nano-modified RPF (nano-RPF) resins were examined. The effects of modification were studied by Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA). The results of FT-IR revealed that the nano-RPF resins were successfully produced by phenol, formaldehyde, and SiO2-Np. The nano-RPF resins demonstrated high thermal stability at temperatures above 500°C. The adhesive performance of the nano-RPF resins was investigated under dry and wet conditions. The nano-RPF resins indicated better adhesive performance than unmodified RPF resin. The RPF resin could be improved by SiO2-Np.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":"66 1","pages":"161-170"},"PeriodicalIF":1.3,"publicationDate":"2021-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42911983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 3
Effects of light thermal treatments on the color, hygroscopity and dimensional stability of wood 光热处理对木材颜色、吸湿性和尺寸稳定性的影响
IF 1.3 4区 农林科学
Wood Research Pub Date : 2021-03-08 DOI: 10.37763/WR.1336-4561/66.1.95104
X. Y. Liu, Xinwei Tu, Mihaela Liu
{"title":"Effects of light thermal treatments on the color, hygroscopity and dimensional stability of wood","authors":"X. Y. Liu, Xinwei Tu, Mihaela Liu","doi":"10.37763/WR.1336-4561/66.1.95104","DOIUrl":"https://doi.org/10.37763/WR.1336-4561/66.1.95104","url":null,"abstract":"Ailanthus wood (Ailanthus desf.) was thermally treated at three different low temperatures (140, 160, 180°C) for 2 and 4 h in order to investigate the effects on wood color, hygroscopity and dimensional stability. Results indicate that mass loss increased following the treatments, while equilibrium moisture content decreased from 11.86% to 9.88% for the 180°C and 4 h treatment. Moreover, improvements in the dimension stability were observed for post-treatment samples. The thermal treatment induced color changes in the Ailanthus wood, with a significant reduction in the lightness, yet the redness and yellowness exhibited minimal changes. FITR spectra of the thermally treated wood suggest that the heat treatment resulted in the deacetylation of hemicellulose. These results help to conclude that thermal treating temperature under 160°C can improve wood dimensional stability and maintain original color.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":"66 1","pages":"95-104"},"PeriodicalIF":1.3,"publicationDate":"2021-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42670025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 13
The concentration of selected heavy metals in poplar wood biomass and liquid fraction obtained after high temperature pretreatment 杨木生物量和高温预处理液中重金属的浓度
IF 1.3 4区 农林科学
Wood Research Pub Date : 2021-03-08 DOI: 10.37763/WR.1336-4561/66.1.3948
D. Krutul, J. Szadkowski, A. Antczak, M. Drożdżek, A. Radomski, S. Karpiński
{"title":"The concentration of selected heavy metals in poplar wood biomass and liquid fraction obtained after high temperature pretreatment","authors":"D. Krutul, J. Szadkowski, A. Antczak, M. Drożdżek, A. Radomski, S. Karpiński","doi":"10.37763/WR.1336-4561/66.1.3948","DOIUrl":"https://doi.org/10.37763/WR.1336-4561/66.1.3948","url":null,"abstract":"The concentration of selected heavy metals: chromium (Cr), manganese (Mn), iron (Fe), nickel (Ni), copper (Cu) and zinc (Zn) in 5-year-old wood of Populus trichocarpa before and after steam explosion (SE) and liquid hot water (LHW) pretreatments was studied. The concentration of the above heavy metals in the liquid fraction obtained after pretreatments was also studied. The studied problem of heavy metals in lignocellulosic biomass is an interesting and important issue in the context of bioethanol production technology. An X-ray f luorescence spectrometer (XRF) was used to analyse the concentration of heavy metals. The change of concentration of the tested elements in wood biomass after pretreatment was small (except for iron). On the other hand, the average concentration of iron in wood biomass of a 5-year-old Populus trichocarpa, after SE and LHW with duration of the pretreatments 15 and 60 min, increased about 24-fold to 28-fold, comparing to its average concentration in native wood. During the pretreatment process, wood biomass absorbed the iron that at high temperatures passed from the pretreatment equipment to the solution. The average concentration of the elements under research in liquid fraction obtained during SE and LHW of wood biomass with duration of the pretreatments 15 and 60 min was at a low level.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":"66 1","pages":"39-48"},"PeriodicalIF":1.3,"publicationDate":"2021-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48550097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 4
Cross-correlation of color and acidity of wet beech wood in the process of thermal treatment with saturated steam 湿山毛榉木材饱和蒸汽热处理过程中颜色与酸度的相互关系
IF 1.3 4区 农林科学
Wood Research Pub Date : 2021-03-08 DOI: 10.37763/WR.1336-4561/66.1.105116
L. Dzurenda, Michal Dudiak
{"title":"Cross-correlation of color and acidity of wet beech wood in the process of thermal treatment with saturated steam","authors":"L. Dzurenda, Michal Dudiak","doi":"10.37763/WR.1336-4561/66.1.105116","DOIUrl":"https://doi.org/10.37763/WR.1336-4561/66.1.105116","url":null,"abstract":"The paper presents changes in the color and acidity of Fagus sylvatica L. in the process of heat treatment of wood with saturated water steam in the temperature range t = 105 – 135°C during τ = 3 to 12 hours. The light white-gray color of beech wood with a yellow tint changes on the pale pink, red-brown to a brown-red color in the heat treatment process. The color changes of beech wood expressed in the form of the total color difference are in the range of values ∆E* = 1.97 – 26.85. Due to the hydrolysis of hemicelluloses, the acidity changes in the process of thermal treatment of wet beech wood. Decrease in acidity of beech wood in the range of temperatures t = 105 – 135 °C and time τ = 3 – 12 hours is in the range of pH values = 4.9 to 3.4. The dependence of the total color difference ∆E* on the change in acidity of beech wood is described by the polynomial of function II. degree. The above knowledge is a suitable tool for evaluating the degree of change in beech wood color in the technological process based on the change in pH of wood.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":"66 1","pages":"105-116"},"PeriodicalIF":1.3,"publicationDate":"2021-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46224216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 8
Analysis of cutting force in the process of chipless felling wood 无屑木材采伐过程中切削力的分析
IF 1.3 4区 农林科学
Wood Research Pub Date : 2021-03-08 DOI: 10.37763/WR.1336-4561/66.1.153160
P. Harvánek, J. Kováč, J. Melicherčík
{"title":"Analysis of cutting force in the process of chipless felling wood","authors":"P. Harvánek, J. Kováč, J. Melicherčík","doi":"10.37763/WR.1336-4561/66.1.153160","DOIUrl":"https://doi.org/10.37763/WR.1336-4561/66.1.153160","url":null,"abstract":"This study compared the magnitude of the value of the cutting force using different tools with different thickness for different wood species with the same size. Measurements were made on wooden samples of spruce, aspen, and beech wood with dimensions 30 × 30 × 200 mm (w × d × h). The tearing machine pushed knives with dimension 150 × 100 mm and thicknesses of 4, 6, 8, and 10 mm with a 30° angle of cutting edge into the wood samples in a direction perpendicular to the fiber growth. Research shows that this angle of cutting edge is most effective for chipless cutting. The results were analysed by the Statistica 12 software. From the measurement results, for chipless wood felling is most preferred the 10 mm cutting knife thickness.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":"66 1","pages":"153-160"},"PeriodicalIF":1.3,"publicationDate":"2021-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44264556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 1
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