Rapid determination of lignocellulose by diffuse reflectance Fourier transform infrared spectrometry

Schultz, Tor P.; Templeton, M. Curry; McGinnis, Gary D.

doi:10.1021/ac00291a027

Cited by 118 publications

(69 citation statements)

References 15 publications

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“…The lignin absorption of untreated Scots pine decreased with increasing exposure time, visible at the lignin absorption at 1510 cm −1 (stretch vibration in aromatic ring), 1452 cm −1 (CH 2 -deformation) and 1264 cm −1 (guaiacyl nuclei) (Schultz and Glasser 1986;Pandey and Theagarajan 1997). These absorptions were absent after 6 months of outside exposure.…”

Section: Chemical Changesmentioning

confidence: 97%

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Weathering characteristics of wood treated with water glass, siloxane or DMDHEU

2011

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Specimens of Scots pine sapwood (Pinus sylvestris) and beech wood (Fagus sylvatica) were treated with a sodium water glass solution, an amino-alkyl-functional oligomeric siloxane and 1,3-dimethylol-4,5-dihydroxyethylene urea (DMDHEU). The specimens were exposed outside without ground contact for 24 months. Colour measurements during outside exposure showed a discoloration of all wood specimen surfaces. FTIR spectroscopy displayed lignin degradation of all specimens during the initial exposure time. Chemical treatments decelerated fungal infestation of wood, while their effect on lignin degradation was not discernible. SEM studies revealed that fungal infestation was affected by the different treatments. The untreated specimens showed radial penetration of fungal hyphae through the pits. Only superficial infestation and no radial penetration were visible at water glass and siloxane treated specimens. A significantly reduced radial penetration of fungal hyphae was exhibited at DMDHEU treated specimens. Fungal infestation through the pits was not visible. Bewitterungseigenschaften von Wasserglas, Siloxan, DMDHEU behandeltem HolzZusammenfassung Prüfkörper aus Kiefer (Pinus sylvestris) und Buche (Fagus sylvatica) wurden mit einem Natriumwasserglas, einem Amino-Alkyl-funktionellem oligomeren Silansystem, und 1,3-dimethylol-4,5-dihydroxyethyleneurea (DMDHEU) behandelt. Unbehandelte und behandelte Prüfkörper wurden für die Dauer von 24 Monaten einer Freilandbewitterung ohne Bodenkontakt ausgesetzt. Ei-A. Pfeffer ( ) ·

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Section: Chemical Changesmentioning

confidence: 97%

“…Infrared spectra of DMDHEU treated Scots pine and beech showed an increase in the carbonyl content (1709 and 1726 cm −1 ) caused by carbonyl groups in DMDHEU (Petersen 1967;Schultz and Glasser 1986;Xie et al 2005). This strong carbonyl band overlaid native carbonyl group absorptions in untreated wood.…”

Section: Chemical Changesmentioning

confidence: 99%

Weathering characteristics of wood treated with water glass, siloxane or DMDHEU

2011

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“…Fourier transform infrared (FTIR) spectroscopy can be used to quantify the chemical composition of a material. It has been widely used in study of pulp, paper, and wood (Berben et al 1987;Rodrigues et al 1998;Schultz et al 1985;Schwanninger et al 2004). Research regarding changes of functional groups during wood decay has been carried out with FTIR (Fackler et al 2006;2010;Jones et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Cell Wall Property Changes of White Rot Larch during Decay Process

Shangguan¹,

Ren²,

Lyu³

et al. 2014

BioResources

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Larch flakes infested with white rot fungus were examined following several infestation durations with respect to the mass loss, tensile strength, hardness, porosity, and change in cell wall components. Nanoindentation, X-ray diffraction (XRD), nitrogen adsorption, and Fourier transform infrared (FTIR) spectroscopy testing methods were employed to investigate the property changes during the decay process. The testing results showed that the mass loss was greater and the longitudinal tensile strength decreased following the first three-week infestation. Nanoindentation measurements revealed that the average MOE of infested larch flakes decreased from 24.0 to 17.1 GPa and the average hardness declined from 528.47 to 427.87 MPa following 12 weeks of infestation. After the first three weeks, the relative crystallinity, surface area, and micropore area of the infested samples increased. These parameters decreased after three weeks had elapsed. Changes in the absorption peaks observed in FTIR explained that the first three-week infestation had a strong effect on the mass loss and strength changes. This suggests that white rot fungus intensely attacked the lignin component of the biomass during the first three weeks of infestation.

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“…4 atualmente, os métodos espectroscópicos encontram-se incorporados nos procedimentos de rotina para investigar a composição química da madeira [5][6][7][8] ou de seus constituintes: celulose, 9 ligninas [10][11][12] e glicose e xilose. 13 Das técnicas de reflexão, a utilizada com maior freqüência é a DRIFT, 14 pois a refletância total atenuada (aTR) necessita que seja estabelecido um contato óptico eficiente entre as superfícies do cristal e da amostra. muitas vezes, a madeira investigada tem dureza elevada e é resistente ao corte, o que limita o uso da aTR.…”

Section: Introductionunclassified

Efeito do intemperismo artificial em quatro madeiras tropicais monitorado por espectroscopia de infravermelho (DRIFT)

Pastore¹,

Oliveira²,

Rubim³

et al. 2008

Quím. Nova

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Recebido em 26/3/08; aceito em 12/6/08; publicado na web em 10/11/08 EFFECT oF aRTIFICIaL wEaThERINg oN TRoPICaL wooDS moNIToRED By INFRaRED SPECTRoSCoPy (DRIFT). Four tropical woods, were investigated to compare their performance and natural resistances to artificial weathering using the diffuse reflectance infrared Fourier transform spectroscopy (DRIFT). The species were garapeira (Apuleia leiocarpa), itaúba (Mezilaurus itauba) and tauari (Couratari sp.), woods traditionally indicated for exterior uses, and marupá (Simarouba amara), that served as reference. The samples were submitted to cycles of UV radiation (350 nm) and water until 2,000 h. The photodegradation processes of woods surfaces were accomplished monitoring the changes in the intensities associated to lignin (1508 cm -1 ) and carbonyl group (1736 cm -1 ) absorptions. The results have shown that lignin was the first component to be photodegradated, resulting in surfaces mainly composed by cellulose, after 2,000 h of UV irradiation. The processes of formation and lixiviation of carbonyl compounds were different for each species. The experimental conditions used in this work were too severe to evaluate the wood density and extractives content influences during the treatment.Keywords: DRIFT; weathering; tropical wood. introduçãoEm curto período de tempo, a superfície de uma madeira submetida a intempéries apresenta variação de cor e, posteriormente, torna-se áspera devido à erosão causada pela água da chuva, que remove os polímeros decompostos e deteriora sua microestrutura. 1 o intemperismo, ação conjunta do sol, da chuva ou umidade e dos ventos, é um processo superficial iniciado pela luz solar que penetra apenas 2,0 mm abaixo da parte externa da madeira.2 a radiação ultravioleta (UV) do espectro solar é o fator considerado mais prejudicial, pois desencadeia reações de decomposição química, levando à formação de radicais livres que atacam os principais constituintes da madeira.3 Embora a ação do intemperismo seja superficial, constitui um problema para os usuários de madeira porque afeta tanto a sua aparência estética como o desempenho dos produtos de proteção aplicados sobre ela. a lignina é o constituinte polimérico da madeira com maior capacidade de absorver energia ultravioleta e visível, pois apresenta uma banda de absorção máxima em 280 nm que se estende até a região do visível, acima de 400 nm. a absorção da luz leva à formação de radicais livres que reagem com o oxigênio e produzem grupos carbonílicos e carboxílicos cromóforos, 2 que por sua vez promovem a variação de cor da madeira. Normalmente, primeiro a coloração da madeira sob irradiação sofre escurecimento e, em seguida, clareamento tendendo a acinzentado. a degradação da celulose é mais lenta e é indicada pela perda de peso e redução do grau de polimerização. 4 atualmente, os métodos espectroscópicos encontram-se incorporados nos procedimentos de rotina para investigar a composição química da madeira 5-8 ou de seus constituintes: celulose, 9 ligninas [10][11][12] e glicose e xilo...

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Rapid determination of lignocellulose by diffuse reflectance Fourier transform infrared spectrometry

Abstract: Analysis of solid lignocellulose Is a lengthy, multlstep proce-

Cited by 118 publications

References 15 publications

Weathering characteristics of wood treated with water glass, siloxane or DMDHEU

Weathering characteristics of wood treated with water glass, siloxane or DMDHEU

Cell Wall Property Changes of White Rot Larch during Decay Process

Efeito do intemperismo artificial em quatro madeiras tropicais monitorado por espectroscopia de infravermelho (DRIFT)

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