Near‐Infrared Spectra and Chemical Characteristics ofPinus taeda(Loblolly Pine) Wood Chips Biotreated by the White‐Rot FungusCeriporiopsis subvermispora

Abstract

Near-infrared (NIR) spectroscopy was evaluated as an analytical tool for monitoring changes in Pinus taeda (loblolly pine) induced by the whiterot fungus Ceriporiopsis subvermispora. Intensities of several NIR bands increased with biodegradation time, but a direct correlation between band 99 intensities and biodegradation periods or weight losses due to the biotreatment were not observed. On the other hand, the intensities of NIR bands correlated with properties reflecting the macromolecular characteristics of the components of the biotreated wood samples. Bio-kraft pulps were also characterized by wet chemical analysis and NIR spectroscopy. In this case, appropriate prediction models related NIR spectral information with the chemical composition of the pulps, r 2 values ranged from 0.96 to 0.99.

Isolation and Characterization of Cellulose Nanocrystals from Rejected Fibers Originated in the Kraft Pulping Process

“…* Chemical composition were determined according to Ferraz et al [26] and ASTM D1102-84 [27]. ** Physical properties were determined in Fiber Tester equipment (Lorentzen and Wettre, Stockholm, Sweden).…”

Near Infrared Monitoring of Untreated and Chemically Delignified Wood

“…35 For loblolly pine, Ceriporiopsis subvermispora white rot was applied as a pretreatment to a Kraft pulping process and a combination of both treatments yielded a similar lignin content range (1.1-28.2%) and R 2 values as in this study but the RMSEP or RPD was not specifically reported. 37 However, they did indicate that there was increased error of prediction for extremely low lignin samples, due to a small number of high leverage samples that may have been outliers but were included in the analysis. This study demonstrates that with a uniform and targeted lignin distribution, smaller particle size, appropriate resolution and possibly extraction, better multivariate models could be achieved for a wide lignin content range using typical delignification techniques.…”

Analytical tools to predict changes in properties of oriented strandboard exposed to the fungus Postia placenta

“…with changes in the cellulose and hemicellulose components , especially the degree of polymerization of the cellulose in the wood (Ferraz et al 2004). The regression coefficients for interlaminar shear strength were similar, but not identical to, those for the specific gravity and dowel-bearing strength.…”

“…Assessment of panel deterioration can be difficult, especially around connections. Recently, NIR spectroscopy has also been used to study changes in the chemical and mechanical properties of solid decayed wood (Gibson et al 1985;Filley et al 2001;Kelley et al 2002;Jellison et al 2002;Gierlinger et al 2003;Ferraz et al 2004). Prior work has shown that NIR spectroscopy can be used to measure basic wood properties (Hauksson et al 2001;Schimleck et al 2004), and chemical and mechanical properties of solid wood (Gindl et al 2001;Thumm and Meder 2001;Kelley et al 2004;Sjö blö m et al 2004) and wood composites (Rials et al 2002).…”