Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 163 for “"Hemicellulose"”.
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Wood extractives in hemicellulose stabilized emulsions
… 30-40% of the wood in the form of cellulose. Hemicelluloses, mainly galactoglucomannans (GGM) in spruce and glucuronoxylan (GX) in birch, comprise around 30% of the mass of wood. By far, this part has not been utilized as raw material but burnt as a source of energy. GGM and GX can be …
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Catalytic Pyrolysis of Cellulose, Hemicellulose and Lignin Model Compounds
… bio oil properties from pyrolysis of cellulose, hemicellulose and lignin model compounds was investigated at 450 °C. NaOH pretreated and untreated cellulose was pyrolyzed on sand and the HZSM-5 catalysts; VPISU001 HZSM-5, BASF HZSM-5, and Sud-Chemie HZSM-5. The pyrolysis of cellulose on BASF and …
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Production of lactic acid by microbial fermentation of hemicellulose sugars
Lactic acid (2-hydroxypropionic acid) is an organic acid which has wide applications in food feed, pharmaceutical industries as well as producing polylactic acid, which is a biodegradable material. Lactic acid is commercially produced by microbial fermentation from starchy materials. Converting …
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Recovery of Xylitol from Fermentation of Model Hemicellulose Hydrolysates Using Membrane Technology
Xylitol can be produced from xylose or hemicellulose hydrolysates by either chemical reduction or microbial fermentation. Current technology for commercial production is based on chemical reduction of xylose or hemicellulose, and xylitol is separated and purified by chromatographic methods. The …
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Adsorption and membrane filtration for the separation and valorization of hemicellulose from organosolv beechwood hydrolyzates
… into their three main constituent’s cellulose, hemicellulose, and lignin. The dissolved hemicellulose and its degradation products usually end up in the wood hydrolyzate. Due to relatively low concentrations and inhomogeneous composition of this process stream, it is usually not recovered. …
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Analysis of genes and enzymes involved in the degradation of hemicellulose and cellulose by Butyrivibrio fibrisolvens H17c
B. fibrisolvens H17c is a Gram-positive obligate anaerobe which has been found in the rumen of most ruminants. Strains of B. fibrisol vens have been reported to exhibit activity toward cellulosic and hemicellulosic substrates. The aim of this thesis was to screen a genebank of B. fibrisolvens H17c …
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A soluble mannan from ripe banana fruit
… to analysis) contained about 48% pectin, 20% hemicellulose, 21% partially hydrolyzable polysaccharides and 11% protein. The hemicellulose represented about 0.05% of the banana fresh weight or about 0.2% of dry weight. Hydrolysis of the hemicellulose and analysis of the resulting sugars via gas …
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Effect of maturity on rumen degradation of tropical and temperate forage cell wall polysaccharides from leaves and stems
… than the respective stems. NDF, cellulose and hemicellulose showed a similar trend. The second part of this study was aimed at determining whether the degree of plant maturity has any effect on the distribution of cellulose and linear and branched fractions of hemicelluloses. Two temperate …
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Modelling and characterisation of the pyrolysis of secondary refuse fuel briquettes and biomass materials
… reactions of the main components which were hemicellulose, cellulose, lignin and plastic. The kinetic parameters estimated through the model were comparable with those reported in the literature. In this research, activation energy values varied between 30 – 70 kJ/mol for lignin pyrolysis, 96 …
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Nutritional Value of Warm- and Cool-Season Grasses for Ruminants
… Bluestem was lower (P < .001) in CP, hemicellulose, and ash, and higher in NDF (P < .001), ADF (P < .001), cellulose (P < .001), and lignin (P < .01) than bermudagrass. The warm-season grasses were lower in the apparent digestibility of DM (P < .001), NDF (P < .01), ADF (P < .05), …
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COMPARATIVE BIOCHEMICAL AND GENETIC STUDIES OF TESTA DEVELOPMENT IN NORMAL AND HULL-LESS PHENOTYPES OF PUMPKIN (CUCURBITA PEPO L)
… (80-90%). A similar reduction was observed for hemicellulose fractions.</p><p>Analyses of precursor pools and reserve compounds at 20 days post-anthesis did not reveal consistent differences in quantities of sugars, free amino acids, total phenolics, lipids and starch between phenotypes. By …
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Nanofibrillation of lignocellulosic biomass into lignin-containing nanocellulose for 3D printing and antimicrobial applications
… pure nanocellulose, LNC contains lignin and hemicellulose that are not fully removed from original lignocellulosic biomass and thus is regarded a novel nanocomposite material. With lignin and hemicellulose, the physicochemical properties of LNC could be enriched and its potential for high-end …
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Two-stage acidic-alkaline pretreatment of Miscanthus for bioethanol production
… desirable sugar recovery from both cellulose and hemicellulose in the biomass, which is essential to improve process economics and competitiveness of bioethanol. To address the issue, this research developed two innovative pretreatment methods successively. Miscanthus was used as the model …
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Isolation of Cellulose Nanofibres: Elucidation of a Novel Approach Utilizing Fungal Pretreatment
… bonds. The cellulose microfibril along with hemicellulose chains that tether to the cellulose microfibrils and other polysaccharides through hydrogen bonding forms the cell wall structural framework. Isolation and application of cellulose nanofibres is expanding rapidly due to their …
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The decomposition of agricultural cellulosic wastes by coprinus cinereus
… with ammonia and hydrochloric acid solutions. Hemicellulose and cellulose were found to be attacked, with hemicellulose decomposed preferentially. At optimum growth conditions, in vitro digestibility of the straw was increased to the level of good quality hay, although this declined after …
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Yield and nutritional value of orchardgrass as influenced by nitrogen and sulphur fertilization and associated red clover
… whereas neutral detergent fiber, lignin and hemicellulose were decreased (P<. 05). Nitrogen fertilization had a quadratic effect (P<.05) on in vivo digestibility of dry matter, acid detergent fiber and hemicellulose and a linear effect (P<.001) on apparent digestibility of crude protein. …
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Effect of pretreatment on the breakdown of lignocellulosic matrix in barley straw as feedstock for biofuel production
Lignocellulosic biomass is composed of cellulose, hemicellulose, lignin and extraneous compounds (waxes, fats, gums, starches, alkaloids, resins, tannins, essential oils, silica, carbonates, oxalates, etc). The sugars within the complex carbohydrates (cellulose and hemicellulose) can be accessed …
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Structure and dynamics of plant cell walls and membrane peptides from solid-state NMR
… types of insoluble polysaccharides: cellulose, hemicellulose and pectin. The spatial arrangement of these macromolecules has been largely elusive due to the lack of high-resolution and sitespecific characterization techniques. Here, we introduce SSNMR to investigate the interactions of …
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