hemicellulose/pinheiro

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Effect of autohydrolysis on Pinus radiata wood for hemicellulose extraction.

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The extraction of hemicellulose from pine wood was studied by applying autohydrolysis treatment. A central composite experimental design was carried out using different temperatures (150-190 °C) and times (30-90 min) to select the most favorable operating conditions for maximizing the extraction of

Short-term dynamics of nonstructural carbohydrates and hemicelluloses in young branches of temperate forest trees during bud break.

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Nonstructural carbohydrates (NSC) are the most important C reserves in the tissues of deciduous and evergreen tree species. Besides NSC, cell-wall hemicelluloses as the second most abundant polysaccharides in plants have often been discussed to serve as additional mobile carbon (C) reserves during

Structural characterization of hemicelluloses fractionated by graded ethanol precipitation from Pinus yunnanensis.

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Fractionation of hemicelluloses from delignified Pinus yunnanensis was carried out with KOH/H(3)BO(3) solution followed by graded precipitation in 15%, 60%, and 90% (v/v) ethanol solutions, respectively. Chemical compositions, physicochemical properties, and structures of the precipitated

Characterization, refining and antioxidant activity of saccharides derived from hemicelluloses of wood and rice husks.

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Samples of rice husks, Eucalyptus globulus wood and Pinus pinaster wood (containing arabinoxylan, acetylated glucuronoxylan and acetylated glucomannan as major hemicellulose components, respectively) were subjected to autohydrolysis. The resulting liquid phases, containing mainly

Deep eutectic solvents' ability to solubilize lignin, cellulose, and hemicellulose; thermal stability; and density.

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An environmentally-friendly method to separate cellulose and hemicelluloses from lignin in recalcitrant biomass for subsequent conversion is desirable to reduce greenhouse gas generation. Easily-prepared, deep eutectic solvents (DESs) have low volatility, wide liquid range, non-flammability,

Carbohydrate-related genes and cell wall biosynthesis in vascular tissues of loblolly pine (Pinus taeda).

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Loblolly pine (Pinus taeda L.), the most widely planted tree species in the United States, is an important source of wood and wood fibers for a multitude of consumer products. Wood fibers are primarily composed of secondary cell walls, and cellulose, hemicelluloses and lignin are major components of

Effects of organosolv pretreatment and enzymatic hydrolysis on cellulose structure and crystallinity in Loblolly pine.

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Ethanol organosolv pretreatment was performed on Loblolly pine to enhance the efficiency of enzymatic hydrolysis of cellulose to glucose. Solid-state (13)C NMR spectroscopy coupled with line shape analysis was used to determine the structure and crystallinity of cellulose isolated from pretreated

Production of ethanol from carbohydrates from loblolly pine: a technical and economic assessment.

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Ethanol from lignocellulosic biomass has the potential to contribute substantially to bioethanol for transportation. We have evaluated the technical and economic feasibility of producing ethanol from the carbohydrates in loblolly pine. In the process evaluated, prehydrolysis with dilute sulfuric

Reaction kinetics of hydrothermal carbonization of loblolly pine.

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Hydrothermal carbonization (HTC) is a pretreatment process to convert diverse feedstocks to homogeneous energy-dense solid fuels. Understanding of reaction kinetics is necessary for reactor design and optimization. In this study, the reaction kinetics and effects of particle size on HTC were

Producing high sugar concentrations from loblolly pine using wet explosion pretreatment.

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We present quantitative analysis of pretreatment for obtaining high conversion and release of sugars from loblolly pine. We use wet explosion (WEx): wet oxidation followed by steam explosion and enzymatic hydrolysis (EH) at high dry matter to solubilize sugars. WEx was conducted at 25% (w/w) solids

Purification and properties of a xylanase from Ceriporiopsis subvermispora cultivated on Pinus taeda.

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The production of hemicellulose and cellulose degrading enzymes by the white-rot fungus Ceriporiopsis subvermispora was determined while growing in Pinus taeda wood chips. Enzymes produced by the fungus were extracted after 30 days of cultivation and at least two different xylanases were secreted.

Galactoglucomannan Oligosaccharides (GGMO) from a molasses byproduct of pine ( Pinus taeda ) fiberboard production.

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"Temulose" is the trade name for a water-soluble molasses produced on a large scale (300-400 tonnes per year) as a byproduct of the fiberboard industry. The feedstock for Temulose is predominantly a single species of pine ( Pinus taeda ) grown and harvested in stands in southeastern Texas. Because

Chemical structure and heterogeneity differences of two lignins from loblolly pine as investigated by advanced solid-state NMR spectroscopy.

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Advanced solid-state NMR was employed to investigate differences in chemical structure and heterogeneity between milled wood lignin (MWL) and residual enzyme lignin (REL). Wiley and conventional milled woods were also studied. The advanced NMR techniques included 13C quantitative direct

Preliminary studies on TCF bleaching of Pinus pinaster acetosolv pulps.

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Oxygen pre-treatment of Pinus pinaster acetosolv pulps has been studied as a first step towards TCF bleaching. Using a 2(3) factorial design, the influence of temperature (80-120 degrees C), time (1-2 h) and NaOH concentration (1.5-3%) on pulp yield in the oxygen stage, chemical composition and

The relationship between fiber-porosity and cellulose digestibility in steam-exploded Pinus radiata.

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Steam explosion after sulphur dioxide impregnation of wood chips is an effective method for improving the enzymatic digestibility of cellulose in the softwood Pinus radiata. Digestibility of pretreated fiber was progressively increased by altering the conditions of steam explosion. With increasing

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