3 Hemicelluloses
Mostrando 1-12 de 21 artigos, teses e dissertações.
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1. Enzyme activity and biochemical changes during production of Lentinula edodes (Berk.) Pegler
Abstract Shiitake is an important edible and medicinal mushroom cultivated worldwide. Its cultivation involves a complex process of browning that precedes the primordia initiation. The present work through the evaluation of enzymes, lectin and β-glucan during the cultivation cycle of Lentinula edodes, the degradation of cellulose, hemicellulose and lignin,
Food Sci. Technol. Publicado em: 07/01/2019
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2. Enzyme activity and biochemical changes during production of Lentinula edodes (Berk.) Pegler
Abstract Shiitake is an important edible and medicinal mushroom cultivated worldwide. Its cultivation involves a complex process of browning that precedes the primordia initiation. The present work through the evaluation of enzymes, lectin and β-glucan during the cultivation cycle of Lentinula edodes, the degradation of cellulose, hemicellulose and lignin,
Food Sci. Technol. Publicado em: 20/12/2018
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3. Study on the pozzolanic activity of sugar cane straw ash produced using different pretreatments
This work systematically describes a laboratory study on different pretreatments of sugar cane straw to produce pozzolanic ash. Two procedures were used to accelerate the hydrolysis of celluloses and hemicelluloses and remove metallic impurities present in significant levels in sugar cane straw: hot water washing and acid leaching. Proximate analysis by ther
Quím. Nova. Publicado em: 2017-04
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4. UTILIZAÇÃO DE HEMICELULOSES CATIÔNICAS, OBTIDAS A PARTIR DO APROVEITAMENTO DA PALHA DE MILHO, ASSOCIADAS COM TANINO PARA O TRATAMENTO DE EFLUENTES DE LAVANDERIA INDUSTRIAL
The synthesis of cationic derivatives of hemicelluloses from corn husk was carried out by the reaction of hemicelluloses with 2,3-epoxypropyltrimethylammonium chloride (ETA) in aqueous sodium hydroxide. The characterization of the cationic derivatives was carried out by elemental analysis, Fourier Transformed Infrared Spectroscopy (FTIR) and Thermogravimetri
Quím. Nova. Publicado em: 2017-01
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5. Application of cationic hemicelluloses produced from corn husk as polyelectrolytes in sewage treatment
Hemicelluloses were extracted from corn husk and converted into cationic hemicelluloses using 2,3-epoxypropyltrimethylammonium chloride. The degree of substitution was determined as 0.43 from results of elemental analysis. The cationic derivative was also characterized by Fourier transform infrared spectroscopy and Carbon-13 magnetic nuclear ressonance. The
Polímeros. Publicado em: 26/07/2013
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6. Caracterização estrutural das hemiceluloses de paredes celulares de cana-de-açúcar / Characterization of the sugarcane cell wall hemicelluloses
O Brasil, segundo maior produtor mundial de biocombustíveis, produz etanol a partir da extração e fermentação de sacarose de colmos de cana-de-açúcar. A utilização da energia presente nas ligações químicas entre os carboidratos da parede celular (celulose, hemiceluloses e pectina), das biomassas de folha e bagaço (hoje ambos considerados resídu
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/06/2012
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7. Sugar cane bagasse prehydrolysis using hot water
Results are presented on the hot water prehydrolysis of sugar cane bagasse for obtaining ethanol by fermentation. The experimental study consisted of the determination of the effect of temperature and time of prehydrolysis on the extraction of hemicelluloses, with the objective of selecting the best operating conditions that lead to increased yield of extrac
Brazilian Journal of Chemical Engineering. Publicado em: 2012-03
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8. Capacidade de deterioração de cepas de Eucalyptus spp. por fungos xilófagos / Capacity of deterioration of stumps of Eucalyptus spp. by xylophagous fungi
On the reform of the forest stand, after the cutting of trees, the remaining strains of Eucalyptus spp. must be removed. The natural degradation of stumps of eucalypts after clear cutting is slow. The mechanical destock raises the cost of production, involves machinery traffic on the ground favoring soil compaction and hindering the growth and distribution o
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/12/2011
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9. Amonização de feno de Coast-cross. / Ammonization in coast-cross hay.
This experiment was accomplished in the Animal Nutrition and Pastures Department in the Institute of Animal Science of the Rural Federal University of Rio de Janeiro. The effects of increasing levels of urea addition were evaluated on the chemical-bromatologic and microbiologic composition of Coast-cross hay. The hay was treated with 5 levels of urea (0, 0,5
Publicado em: 2009
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10. UtilizaÃÃo da serragem de Eucalyptus sp. na preparaÃÃo de carvÃes ativados / Utilization of sawdust of Eucalyptus sp. for activated carbons preparation
The aim of this study was to use the eucalyptus sawdust, waste timber industry, in the preparation of activated carbons (AC) and test them as adsorbents of organic compounds and metal ions. Initially, the Eucalyptus sp sawdust was characterized by chemical analysis like cellulose, lignin, hemicelluloses, ash and extractives content as well as some instrument
Publicado em: 2009
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11. Casca de arroz processada via enzimólise como fonte de carbono para produção de celulose por Acetobacter xylinum / Rice husk processed with hidrolityc enzimes as source of carbon for the production of bacterial cellulose by Acetobacter xylinum
Bacterial cellulose (BC) has been applied in the electronic industry and in medicine as a wound dressing film. However, the high manufacturing cost limits its wide-scale use. To reduce the costs of the process and obtain a differentiated product, this work proposes the use of rice husk as a substrate for the production of BC, since it consists of minerals, c
Publicado em: 2008
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12. Effect of age of the wood of eucalyptus in its chemical and pulpability, and bleachability and properties of the pulp / Efeito da idade da madeira de eucalipto na sua química e polpabilidade, e branqueabilidade e propriedades físicas da polpa
The concern about the quality of the wood that enters a cellulose factory has been focused on many studies, once the productive process and final product are under great influence of the original raw material. Considering the demand for younger trees, the effect of the age of the wood in the chemical constitution and the variables of the process, as well as
Publicado em: 2008