Biodeterioração de produtos à base da madeira de cedro australiano (Toona ciliata M. Roem. var. australis)

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dc.creatorAlmeida, Natália Amarante
dc.creatorMendes, Lourival Marin
dc.creatorOkino, Esmeralda Yoshico Arakaki
dc.creatorGarlet, Alencar
dc.creatorMori, Fábio Akira
dc.creatorMendes, Rafael Farinassi
dc.date2016-04-04
dc.date.accessioned2017-08-01T20:14:46Z
dc.date.available2017-08-01T20:14:46Z
dc.date.issued2017-08-01
dc.descriptionThe objectives of this study were to evaluate the natural resistance of composite and solid wood panels from Toonaciliata to fungal attack through accelerated laboratory testing, to characterize the anatomical components of the wood according to IAWA, to quantify the soluble and insoluble lignin contents by acid hydrolysis and to determine the colorimetric parameters before and after fungal attack by using the CIE-L*a*b*(1976) system. Solid wood was classifi ed as moderately and highly resistant to white-rot fungus (Trametes versicolor) and to brown-rot fungus (Gloeophyllum trabeum). OSB panels were found to be resistant and moderately resistant to white-rot fungus and highly resistant to brown-rot fungus. Variation in species and particle type did not have a positive effect on the treatments. As regards the wood, both fungi were inhibited by the presence of phenolic resin. Particleboard panels were classifi ed as moderately resistant to white-rot fungus. Treatments T2 (cedar) and T4 (cedar-eucalyptus) were resistant while treatment T3 (cedar-pine) was not resistant to attack by brown-rot fungus. The urea-formaldehyde resin failed to inhibit attack in the same way the phenolic resin did. Anatomically, the species was found to have medium texture, straight vessel lines, pleasant smell after incision and poor luster on the radial surface. Its anatomical structure favored colonization by the threadlike fi laments of the fungi. All treatments caused wood darkening after attack by the G. trabeum fungus, with total variation in color. It was observed that with weight loss an increase followed in insoluble lignin contents, in all treatments, indicating that this chemical property is a determining factor in wood resistance to the attack of the fungi being evaluated.
dc.formatapplication/pdf
dc.identifierhttp://www.cerne.ufla.br/site/index.php/CERNE/article/view/794
dc.identifier.citationALMEIDA, N. A. et al. Biodeterioração de produtos à base da madeira de cedro australiano (Toona ciliata M. Roem. var. australis). Cerne, Lavras, v. 18, n. 1, p. 17-26, jan./mar. 2012.
dc.identifier.urihttps://repositorio.ufla.br/handle/1/14476
dc.publisherCERNE
dc.publisherCERNE
dc.relationhttp://www.cerne.ufla.br/site/index.php/CERNE/article/view/794/576
dc.rightsAttribution 4.0 International
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.sourceCERNE; Vol 18 No 1 (2012); 17-26
dc.sourceCERNE; Vol 18 No 1 (2012); 17-26
dc.source2317-6342
dc.source0104-7760
dc.subjectToona ciliata
dc.subjectComposite wood panels
dc.subjectBiodeterioration
dc.subjectBiodeterioração
dc.subjectPainéis reconstituídos
dc.titleBiodeterioração de produtos à base da madeira de cedro australiano (Toona ciliata M. Roem. var. australis)
dc.title.alternativeBiodeterioration of products made from australian cedar (Toona ciliata M. Roem. var. australis)
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:eu-repo/semantics/publishedVersion

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