Biodegradation of eucalyptus urograndis wood by fungi

Negrão, Djanira Rodrigues; Júnior, Tadeu Antônio Fernandes da Silva; Passos, José Raimundo de Souza; Sansígolo, Cláudio Angéli; Minhoni, Marli Teixeira de Almeida; Furtado, Edson Luiz

doi:10.1016/j.ibiod.2014.01.004

Cited by 30 publications

(22 citation statements)

References 26 publications

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“…La segunda etapa de la degradación es atribuida a la colonización del substrato a partir de la superficie expuesta, la cual ocurre por la acción de agentes biológicos, principalmente hongos xilófagos, hongos cromógenos y mohos, los cuales afectan a las propiedades físico-químicas de la madera (Jebrane et al 2014, Negrão et al 2014, Plaschkies et al 2014. Por lo tanto, es posible decir que la actividad fisiológica de estos agentes biológicos puede cambiar dependiendo del entorno ambiental de exposición y dentro de un mismo entorno ambiental (Brischke et al 2014).…”

Section: Resultados Y Discusiónunclassified

Color de la madera de dos eucaliptos expuestas al intemperismo natural en tres entornos ambientales diferentes

Delucis

Herrera²,

Labidi³

et al. 2016

Maderas, Cienc. tecnol.

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RESUMENLa degradación superficial en madera de exteriores se debe a una combinación de factores meteorológicos inherentes al entorno de exposición y a la colonización de organismos xilófagos. Desde un punto de vista técnico y económico se trata de uno de los principales problemas para la industria de productos y materiales hechos a partir de la madera. El objetivo del presente trabajo es el de monitorizar la degradación superficial de las maderas de Corymbia citriodora y Eucalyptus tereticornis originarias de plantaciones de rápido crecimiento de Brasil, las cuales han sido expuestas a ensayos de intemperismo natural en tres entornos ambientales distintos. La monitorización de los cambios en el material fue realizada mediante estimaciones del color (método CIEL*a*b*), en ciclos de 45 días, hasta completar un periodo de 360 días de exposición. Los resultados mostraron que el material expuesto al entorno forestal fue menos afectado por los factores ambientales, lo que ha sido probablemente debido al aislamiento térmico y solar que proporciona este tipo de ecosistema. A su vez, se observó que las probetas de madera de Corymbia citriodora presentaron mayor resistencia al deterioro que las probetas de madera de Eucalyptus tereticornis, posiblemente debido a ciertas diferencias en su constitución química.Palabras clave: Biodegradación, biodeterioro, Corymbia citriodora, Eucalyptus tereticornis, fotodegradación. ABSTRACTSurface degradation in outdoor wood and products is due to a combination of inherent climate factors together with colonization of decay organisms. From a technical and economic standpoint it is one of the main problems for the industry of products and materials made from wood. The aim of this work is to track the surface degradation of Corymbia citriodora and Eucalyptus tereticornis timbers originating from fast-growing plantations in Brazil, which have been exposed to outdoor weathering tests in three different environmental conditions. Changes in the material were monitoring using color measurement (CIEL*a*b* method), in cycles of 45 days up to a period of 360 days of exposure. The results showed that timber exposed to a forest ecosystem was less affected by environmental factors; this is probably due to climate insulation provided by these ecosystems. Besides, it was observed that samples of Corymbia citriodora had higher resistance to degradation compared with samples of Eucalyptus tereticornis, possibly due to differences in its chemical constitution.

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Section: Resultados Y Discusiónunclassified

Color de la madera de dos eucaliptos expuestas al intemperismo natural en tres entornos ambientales diferentes

Delucis

Herrera²,

Labidi³

et al. 2016

Maderas, Cienc. tecnol.

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“…In 2013 alone, Eucalyptus was cultivated on 5.47 million hectares, which represents some 72 % of the land area occupied by planted trees in the country. Commercial activities that employ Eucalyptus wood include paper manufacture and industrial firewood and charcoal production, most of which is used as a carbon source for the carbothermic reduction of iron ore in the steel‐making industry . Despite the large quantities consumed for these purposes, there is still an excess of Eucalyptus available to create added value commercially, and Brazil is counting on Eucalyptus as a logical choice for the production of biofuels and chemicals.…”

Section: Introductionmentioning

confidence: 99%

“…Biomassi sarenewable carbon source that can be used to produce heat, electricity,t ransportation fuels,a nd chemical intermediates.W oody biomass is one of the main feedstocks that much of the world relies upon to develop cellulosic biorefineries sustainably to produce liquid fuels and bio-based productst hat do not interrupt the food supply.I nB razil, the Eucalyptus genus is one of the main forestr esources that drives the economice ngine.I n2 013 alone,E ucalyptus was cultivated on 5.47 million hectares,w hich represents some 72 %o ft he land area occupied by planted trees in the country.C ommercial activities that employ Eucalyptus wood include paper manufacture and industrial firewooda nd charcoal production,m ost of which is used as ac arbon source for the carbothermic reduction of irono re in the steel-making industry. [1][2][3] Despite the large quantities consumed for these purposes,t here is still an excesso fE ucalyptus available to create added value commercially,a nd Brazili sc ounting on Eucalyptus as al ogical choice for the productiono fb iofuels and chemicals.…”

Section: Introductionmentioning

confidence: 99%

Aromatic Hydrocarbon Production from Eucalyptus urophylla Pyrolysis over Several Metal‐Modified ZSM‐5 Catalysts

2016

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Metal‐modified HZSM‐5 catalysts were prepared by the ion exchange of NH4ZSM‐5 (SiO2/Al2O3=23) using Zn, Ga, Ni, and combinations thereof. The prepared catalysts were used to evaluate catalytic pyrolysis for the conversion of Eucalyptus urophylla to fuels and chemicals, specifically aromatic hydrocarbons, by using a micro‐scale pyrolysis reactor coupled with GC–MS. Two different biomass‐to‐catalyst ratios (1:5 and 1:10 w/w) were studied. The catalyst prepared with Ga by total ion exchange (Ga‐HZSM‐5 B, ≈7 wt % Ga) yielded the highest amount of aromatic hydrocarbons, whereas the catalysts modified with Ni produced the lowest yield of aromatic hydrocarbons. A correlation between the methane yield and benzene and p‐xylene selectivity was found for the catalysts, which was observed mainly for the Ni‐, Zn‐, and Ga‐Ni‐modified catalysts. The Ga‐modified catalysts were the most selective for xylenes, whereas the Ni‐based catalysts were the most selective for benzene production with a concurrent increase in methane production. The Zn‐modified catalysts were the most selective for toluene production.

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“…We presume that result is due to the higher moisture content in the flooded site, which improves the physiological activity of xylophagous agents. According to Negrão et al 2014, the ratio of wood deterioration exposed to xylophagous agents is related to the equilibrium moisture content of wood.…”

Section: Physical Characterizationmentioning

confidence: 99%

“…Brischke et al (2014), reported that equilibrium moisture content is not an interesting parameter to predict wood deterioration because the effect of both temperature and wind superposes the effect of moisture content below the wood fiber saturation point (~30%). According to Negrão et al (2014), the type of xylophagous agent affects the wood's moisture retention, since some fungi attack the wood's polysaccharides and other fungi prefer the lignin as a nutrient.…”

Section: Physical Characterizationmentioning

confidence: 99%

Decay resistance of four fast-growing Eucalypts wood exposed to three types of fields

Delucis

Cademartori

Missio

et al. 2016

Maderas, Cienc. tecnol.

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The evaluation of wood durability enables the definition of reliable parameters to predict the servicelife of wood-based products. This study aimed to evaluate the wood deterioration of four fast-growing eucalypts species (Eucalyptus botryoides, Corymbia citriodora, Eucalyptus paniculata e Eucalyptus tereticornis) exposed to three field tests (outdoor, flooded site and forest canopy) during 540 days. The physical properties measured were: mass loss, density and moisture content. Furthermore, we determined changes in wood color by CIEL*a*b* method and performed a visual analysis by CEN grades. Among the four wood eucalypts, Eucalyptus tereticornis presented the highest decay resistance. The flooded site presented the best conditions for the proliferation of xylophagous agents. Mature wood was least susceptible to deterioration than juvenile wood.

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Biodegradation of eucalyptus urograndis wood by fungi

Cited by 30 publications

References 26 publications

Color de la madera de dos eucaliptos expuestas al intemperismo natural en tres entornos ambientales diferentes

Color de la madera de dos eucaliptos expuestas al intemperismo natural en tres entornos ambientales diferentes

Aromatic Hydrocarbon Production from Eucalyptus urophylla Pyrolysis over Several Metal‐Modified ZSM‐5 Catalysts

Decay resistance of four fast-growing Eucalypts wood exposed to three types of fields

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