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Registros recuperados: 19
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Alkaline treatment for extraction of hemicellulose. Repositório Alice
CLARO, F. C.; MATOS, M. de; MAGALHAES, W. L. E..
bitstream/item/195487/1/2018-RAC-Washington-ISNPC-Alkaline.pdf
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Polímero natural; Natural polymers; Celulose; Hemicelulose; Cellulose; Hemicellulose.
Ano: 2018 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1107943
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Avaliação da fração fibrosa de cama de frangos em função do tempo de estocagem. Repositório Alice
SOBREIRA, A. L. M. A.; AZEVEDO, A. R.; ALVES, A. A.; BASTOS, F. J. S.; ARRUDA, F. A. V..
Resumo: Avaliou-se a fracao fibrosa de camas de frangos de raspa de madeira(C1), capim-elefante Napier(C2), sabugo com palha(C3) e parte aerea da mandioca(C4) estocadas por 0; 14,28; 42 e 56 dias. Para C1, C2, C3 e C4, respectivamente, obteve-se medias de FB: 41,58; 29,04; 24,84; 23,07%; FDN: 72,02; 68,04; 67,42; 62,35%; FDA: 48,78; 37,91; 31,55; 35,81%; Hemicelulose: 23,42; 30,13; 35,87; 27,59% e lignina: 14,78; 6,44; 4,01; 10,36%, nao ocorrendo efeito da estocagem. Houve efeito do tempo de estocagem sobre o o teor de celulose, verificando-se para C1: 31,47a.; 34,82a.; 33,95a; 35,69a.; 32,81a%; C2: 31,44a; 28,80ab; 29,72ab; 32,64a; 29,36ab%; C3:21,25b; 24,71bc; 27,33bc; 33,00a; 25,83ab% e C4: 25,59b; 22,04c; 23,49c; 25,23b; 24,68b% a 0; 14; 28; 42 e 56...
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Fracao fibrosa; Celulose; Cama de galinheiro; Fibra bruta; Lignina; Hemicelulose; Hemicellulose; Cellulose; Lignins; Crude fibre.
Ano: 1996 URL: http://www.alice.cnptia.embrapa.br/handle/doc/515287
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Bioconversion of hydrolyzed cashew peduncle bagasse for ethanol and xylitol production AGRIAMBI
Medeiros,Lorena L. de; Silva,Flávio L. H. da; Santos,Sharline F. M.; Madruga,Marta S.; Melo,Débora J. N. de; Conrado,Líbia de S..
ABSTRACT The agro-industrial waste deposited in the environment causes problems in nature that can be solved with the use and generation of bioproducts. Thus, the objective was to study the lignocellulosic fraction of cashew (Anacardium occidentale L.) peduncle bagasse and fermentation on large scale (8-16 times) using the strain Candida guilliermondii CCT-3544 as production agent. According to the obtained results, it can be noted that the dry cashew peduncle bagasse has 21.45% of cellulose, 10.96% of hemicellulose and 35.39% of lignin. During fermentation, C. guilliermondii 3544-CAT was able to grow on medium containing hydrolysate, with maximum cell growth concentration of 3.5 g L-1. The behavior of the sugars in the fermentation process was similar in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Anacardium occidentale L.; Candida guilliermondii; Hemicellulose; Bioproduction.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000700488
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Cell wall biochemistry of sapodilla (Manilkara zapota) submitted to 1-methylcyclopropene Braz. J. Plant Physiol.
Morais,Patrícia L.D.; Miranda,Maria R.A.; Lima,Luis C.O.; Alves,José D.; Alves,Ricardo E.; Silva,José D..
Sapodilla (Manilkara zapota) is a climacteric fruit that ripens shortly after harvest. Studies on its conservation during storage have been mainly restricted to using low temperatures and modified atmospheres. In this study we investigated the influence of 1-methylcyclopropene (1-MCP) on the physiological and biochemical changes that sapodilla cell wall undergoes during ripening and evaluated its potential to preserve sapodilla fruits at postharvest. Fruits were treated with ethylene antagonist 1-MCP at 300 nL L-1 for 12 h and then stored under a modified atmosphere at 25ºC for 23 d. 1-MCP significantly delayed softening of sapodilla for 11 d as a consequence of inhibition of cell wall degrading enzyme activities, and thus 1-MCP-treated fruit exhibited a...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cell wall hydrolases; Ethylene; Hemicellulose; Neutral sugar; Fruit ripening; Uronides.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202008000200001
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Cloning and endogenous expression of a Eucalyptus grandis UDP-glucose dehydrogenase cDNA Genet. Mol. Biol.
Labate,Mônica T. Veneziano; Bertolo,Ana L. Ferreira; Nascimento,Daniela Defávari do; Gutmanis,Gunta; Andrade,Alexander de; Rodrigues,Maria J. Calderan; Camargo,Eduardo L.O.; Boaretto,Luis Felipe; Moon,David H.; Bragatto,Juliano; Labate,Carlos A..
UDP-glucose dehydrogenase (UGDH) catalyzes the oxidation of UDP-glucose (UDP-Glc) to UDP-glucuronate (UDP-GlcA), a key sugar nucleotide involved in the biosynthesis of plant cell wall polysaccharides. A full-length cDNA fragment coding for UGDH was cloned from the cambial region of 6-month-old E. grandis saplings by RT-PCR. The 1443-bp-ORF encodes a protein of 480 amino acids with a predicted molecular weight of 53 kDa. The recombinant protein expressed in Escherichia coli catalyzed the conversion of UDP-Glc to UDP-GlcA, confirming that the cloned cDNA encodes UGDH. The deduced amino acid sequence of the cDNA showed a high degree of identity with UGDH from several plant species. The Southern blot assay indicated that more than one copy of UGDH is present...
Tipo: Info:eu-repo/semantics/article Palavras-chave: UDP-glucose; UDP-glucuronate; Hemicellulose; Pectin; Cell wall.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000400015
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Composição química de plantas de cobertura sob manejo na floração e maturação: efeitos na dinâmica de decomposição de resíduos vegetais. Infoteca-e
CARVALHO, A. M. de; SOUZA, L. L. P. de; CASTRO ALVES, P. C. A.; GUIMARAES JUNIOR, R..
2009
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) Palavras-chave: Cerrado; Planta de cobertura; Plantio direto; No-tillage; Organic matter; Lignin; Hemicellulose; Cellulose; Green manure; Savanna.
Ano: 2009 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/953747
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Draft genome of Thermomonospora sp. CIT 1 (Thermomonosporaceae) and in silico evidence of its functional role in filter cake biomass deconstruction Genet. Mol. Biol.
Omori,Wellington P.; Pinheiro,Daniel G.; Kishi,Luciano T.; Fernandes,Camila C.; Fernandes,Gabriela C.; Gomes-Pepe,Elisângela S.; Pavani,Claudio D.; Lemos,Eliana G. de M.; Souza,Jackson A. M. de.
Abstract The filter cake from sugar cane processing is rich in organic matter and nutrients, which favors the proliferation of microorganisms with potential to deconstruct plant biomass. From the metagenomic data of this material, we assembled a draft genome that was phylogenetically related to Thermomonospora curvata DSM 43183, which shows the functional and ecological importance of this bacterium in the filter cake. Thermomonospora is a gram-positive bacterium that produces cellulases in compost, and it can survive temperatures of 60 ºC. We identified a complete set of biomass depolymerizing enzymes in the draft genome of Thermomonospora sp. CIT 1, such as α-amylase, catalase-peroxidases, β-mannanase, and arabinanase, demonstrating the potential of this...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Actinobacteria; Pectin; Hemicellulose; Crystalline cellulose; Orthologous genes.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572019000100145
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Effect of the hemicellulose in the properties of nanopaper. Repositório Alice
CLARO, F. C.; MATOS, M. de; MAGALHAES, W. L. E..
The foldable, low thermal expansion, and optically transparent are main properties of paper produced with cellulose nanofibers (nanopaper), being able to be used ifl the development of flexible circuit technologies. In this context, this work evaluates the importance of hemicellulose in the properties of nanofiber paper (NFP). The hemicellulose extraction from Pinus sp bleached cellulose pulp was performed with NaOH 17.5% for 1.5 h. Thereafter, the pulp was washed with 8.3% NaOH, then was add 10% acetic acid until neutralization, and washed with water. The nanofibrils were obtained by mechanical defibrillation in a Super Masscoloider Masuko Sangyo mill. The NFP with the grammage of 40 and 50 g/m2 were produced by filtration and drying under pressure. The...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Nanofibra; Permeabilidade do ar; Bleached pulp; Air permeability; Hemicelulose; Nanofibers; Hemicellulose; Tensile strength.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1075217
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Flooding tolerance and cell wall alterations in maize mesocotyl during hypoxia. Repositório Alice
VITORINO, P.G.; ALVES, J.D.; MAGALHAES, P.C.; MAGALHAES, M.M.; LIMA, L.C.O.; OLIVEIRA, L.E.M. de.
This research aimed to characterize the tolerance to flooding and alterations in pectic and hemicellulose fractions from mesocotyl of maize tolerant to flooding when submitted to hypoxia. In order to characterize tolerance seeds from maize cultivars Saracura BRS-4154 and BR 107 tolerant and sensitive to low oxygen levels, respectively, were set to germinate. Plantlet survival was evaluated during five days after having been submitted to hypoxia. After fractionation with ammonium oxalate 0.5% (w/v) and KOH 2M and 4M, Saracura BRS-4154 cell wall was obtained from mesocotyl segments with different damage intensities caused by oxygen deficiency exposure. The cell wall fractions were analyzed by gel filtration and gas chromatography, and also by Infrared...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Pectic substances; Hemicellulose; Substancias pecticas; Hemicelulose.
Ano: 2001 URL: http://www.alice.cnptia.embrapa.br/handle/doc/103963
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Flooding tolerance and cell wall alterations in maize mesocotyl during hypoxia. Repositório Alice
VITORINO, P.G.; ALVES, J.D.; MAGALHAES, P. C.; MAGALHAES, M.M.; LIMA, L.C.O.; OLIVEIRA, L.E.M. de..
ABSTRACT - This research aimed to characterize the tolerance to flooding and alterations in pectic and hemicellulose fractions from mesocotyl of maize tolerant to flooding when submitted to hypoxia. In order to characterize tolerance seeds from maize cultivars Saracura BRS-4154 and BR 107 tolerant and sensitive to low oxygen levels, respectively, were set to germinate. Plantlet survival was evaluated during five days after having been submitted to hypoxia. After fractionation with ammonium oxalate 0.5% (w/v) and KOH 2M and 4M, Saracura BRS-4154 cell wall was obtained from mesocotyl segments with different damage intensities caused by oxygen deficiency exposure. The cell wall fractions were analyzed by gel filtration and gas chromatography, and also by...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Milho; Substancias pecticas; Hemicelulose; Zea mays; Maize; Pectic substances; Hemicellulose.
Ano: 2001 URL: http://www.alice.cnptia.embrapa.br/handle/doc/485067
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Flooding tolerance and cell wall alterations in maize mesocotyl during hypoxia PAB
Vitorino,Patrícia Goulart; Alves,José Donizeti; Magalhães,Paulo César; Magalhães,Marcelo Murad; Lima,Luíz Carlos Oliveira; Oliveira,Luiz Edson Mota de.
This research aimed to characterize the tolerance to flooding and alterations in pectic and hemicellulose fractions from mesocotyl of maize tolerant to flooding when submitted to hypoxia. In order to characterize tolerance seeds from maize cultivars Saracura BRS-4154 and BR 107 tolerant and sensitive to low oxygen levels, respectively, were set to germinate. Plantlet survival was evaluated during five days after having been submitted to hypoxia. After fractionation with ammonium oxalate 0.5% (w/v) and KOH 2M and 4M, Saracura BRS-4154 cell wall was obtained from mesocotyl segments with different damage intensities caused by oxygen deficiency exposure. The cell wall fractions were analyzed by gel filtration and gas chromatography, and also by Infrared...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pectic substances; Hemicellulose.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2001000800004
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Influência da hemicelulose na formação de nanofibrilas. Repositório Alice
CLARO, F. C.; MATOS, M. de; MAGALHAES, W. L. E..
É crescente o interesse na utilização da celulose nanofibrilada devido as suas propriedades físicas como alta resistência, baixa densidade e translucidez, além dos benefícios ecológicos. A polpa celulósica obtida pelo processo Kraft frequentemente utilizada no processo de obtenção da nanofibrilas apresenta cerca de 15% em massa de hemicelulose, sendo importante avaliar a influência da hemicelulose na formação das nanofibras. Para tal, foram produzidas suspensões de nanocelulose uma com hemicelulose e outra na qual a hemicelulose foi extraída, obtidas pelo método mecânico de desfibrilação da celulose. As técnicas empregadas para a caracterização foram difração de raios x, microscopia eletrônica de transmissão e reologia. O comportamento reológico mostrou...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Reologia; Nanofibra; Cristalinidade; Crystallinity; Hemicelulose; Hemicellulose; Rheology; Nanofibers.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1081534
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Influência da hemicelulose na reologia de suspensões de nanocelulose e na formação de filmes de nanofibrilas. Repositório Alice
CLARO, F. C.; MATOS, M. de; MAGALHAES, W. L. E..
É crescente o desenvolvimento de filmes nano-estruturados para uso em embalagens. Nesse contexto, a utilização de celulose nanofibrilada é interessante devido às suas propriedades físicas: como alta resistência, baixa densidade e translucidez, além dos benefícios ecológicos. A polpa celulósica utilizada no processo de obtenção da nanofibrilas apresenta cerca de 15% em massa de hemicelulose, portanto é importante compreender qual o efeito da hemicelulose nas propriedades dos filmes de nanofibras. Para isso, foram produzidas suspensões de nanocelulose uma com hemicelulose e outra na qual a hemicelulose foi extraída com tratamento alcalino. As suspensões foram obtidas pelo método mecânico de desfibrilação. Os filmes foram produzidos com gramaturas de 40 e 50...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Reologia; Nanofibra; Resistência à tração; Permeabilidade ao ar; Air permeability; Hemicelulose; Hemicellulose; Rheology; Nanofibers; Tensile strength.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1081393
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Kinetics of high-Level of ß-glucosidase production by a 2-deoxyglucose-resistant mutant of Humicola lanuginosa in submerged fermentation BJM
Bokhari,Syed Ali Imran; Latif,Farooq; Rajoka,Muhammad Ibrahim.
A 2-deoxyglucose-resistant mutant (M7) of Humicola lanuginosa was obtained by exposing conidia to γ-rays and permitting expression in broth containing 0.6% 2-deoxyglucose (DG) and cellobiose (1%) before plating on DG esculin-ferric ammonium citrate agar medium from which colonies showing faster and bigger blackening zones were selected. Kinetic parameters for enhanced ß-glucosidase (BGL) synthesis by M7 were achieved when corncobs acted as the carbon source. The combination between corncobs and corn steep liquor was the best to support higher values of all product formation kinetic parameters. Effect of temperature on the kinetic and thermodynamic attributes of BGL production equilibrium in the wild organismand M7was studied using batch process at eight...
Tipo: Info:eu-repo/semantics/article Palavras-chave: SS-Glucosidase; Enthalpy; Entropy; Hemicellulose; Kinetics; Regulation; Submerged fermentation.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822008000400024
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Puritication and structural characterization of a (4-O-methyl)-glucuronoxylan from gabiroba fruit (campomanesia xanthocarpa berg). Repositório Alice
BARBIERI, S. F.; RUTHES, A. C.; PETKOWICZ, C. L.; KERKHOVEN, N. C.; SILVA, E. da; GODOY, R. C. B. de; SILVEIRA, J. L..
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Guabiroba; Espécie nativa; Hemicelulose; Campomanesia xanthocarpa; Hemicellulose.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1076008
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Relevance of endo-B-mannanase enzyme in coffee seed deterioration process. Repositório Alice
FREITAS, M. N. de; ROSA, S. D. V. F. da; CLEMENTE, A. da C. S.; PEREIRA, C. C..
The endo-?-mannanase acts on the hemicellulose fraction of the endosperm cell walls, mainly mannans and galactomannans. This process weakens cell walls and allows radicle protrusion during seed germination, but may also occur during the deterioration process. Thus, the aim of this research was to determine the activity of endo-?-mannanase enzyme in dry coffee seeds and in soaked seeds, evaluating its relationship between physiological qualities. Coffee seeds obtained by different processing methods (natural, fermented and demucilated) and drying (sun, shade and dryer) were used. Seed quality was evaluated by germination and tetrazolium tests, and the endo-?-mannanase enzyme activity was determined in dry seeds and after 10 days of soaking. From the...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Physiological quality; Processing; Drying; Hemicellulose; Endosperm.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1081994
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Teores de hemicelulose, celulose, lignina e nitrogênio durante a decomposição de resíduos vegetais de cana-de-açúcar no Cerrado. Repositório Alice
COELHO, M. C.; COSER, T. R.; CARVALHO, A. M. de; SANTOS JUNIOR, J. de D. G. dos; REIN, T. A.; SA, M. A. C. de.
2013
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Decaimento; Solo; Cana de açúcar; Celulose; Lignina; Nitrogenio; Hemicelulose; Bromatologia; Food science; Soil; Sugarcane; Saccharum officinarum; Cellulose; Lignin; Nitrogen; Hemicellulose.
Ano: 2013 URL: http://www.alice.cnptia.embrapa.br/handle/doc/976343
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Teores de hemiceluloses, celulose e lignina em plantas de cobertura com potencial para sistema plantio direto no Cerrado. Infoteca-e
CARVALHO, A. M. de; DANTAS, R. DE. A.; COELHO, M. C.; LIMA, W. M.; SOUZA, J. P. S. P. DE; FONSECA, O. P.; GUIMARAES JUNIOR, R..
2010
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) Palavras-chave: Cerrado; Hemicelulose; Celulose; Lignina; Plantio direto; Adubo verde; No-Tillage; Green manure; Savanna; Chemical composition; Organic matter; Hemicellulose; Cellulose; Lignin.
Ano: 2010 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/883969
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Xylose production from sugarcane bagasse by surface response methodology AGRIAMBI
Paiva,José E. de; Maldonade,Iriani R.; Scamparini,Adilma R. P..
The aim of this study was to optimize the production of xylose from sugarcane bagasse. The hydrolysis process was carried out to evaluate the effect of temperature and sulphuric acid concentration on the xylose production at 18, 30, and 50 min of hydrolysis. A Central Composite Rotatable Design (CCRD) was used to study two process variables, temperature (111.5; 114.0; 120.0; 126.0 and 128.5 ºC) and sulphuric acid concentration (0.20; 0.70; 1.90; 3.10 and 3.60% v v-1). Sulphuric acid had a greater influence on the hydrolysis process than temperature. At concentrations of sulphuric acid higher than 3.10% (v v-1), raising temperature had little influence on the yield of xylose production. The best condition to obtain xylose (266.73 mg g-1 of dry bagasse) was...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hemicellulose; Hydrolysis; HPLC; Aldopentose; Renewable carbon source.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662009000100011
Registros recuperados: 19
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