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dc.contributor.authorGurgel, Monique de Moura
dc.date.accessioned2023-12-21T18:38:34Z-
dc.date.available2023-12-21T18:38:34Z-
dc.date.issued2016-04-29
dc.identifier.citationGURGEL, Monique de Moura. Processo de ozonólise aplicado ao aproveitamento tecnológico de resíduos de coco verde. 2016. 129 f. Tese (Doutorado em Ciências Ambientais e Florestais) - Instituo de Florestas, Universidade Federal Rural do Rio de Janeiro, Seropédica-RJ, 2016.por
dc.identifier.urihttps://rima.ufrrj.br/jspui/handle/20.500.14407/9414-
dc.description.abstractAnálises químicas e estruturais dos produtos de biomassa tropical tem se tornado um potencial interesse para produção de novos produtos que agreguem valores sustentáveis, dentre eles, os biocombustíveis. Resíduos de coco se tornam promissores pois não competem com a indústria alimentícia e podem ser transformados em um produto de maior valor agregado visto serem de origem lignocelulósica. Nesse contexto, os cocos verdes foram separados entre fibra e parênquima e por conseguinte, caracterizados a nível anatômico para que melhor pudesse ser compreendido a relação do tratamento utilizado para deslignificação; no caso, a ozonólise, assim como as alterações químicas e composicionais da parede celular. Para acessar os carboidratos, a lignina precisa ser removida, portanto foi explorado as mudanças induzidas pelo ozônio sob condições de pH; através adição de ácido acético e hidróxido de sódio, e tempo. O tratamento com ozônio em solução de água biodeionizada foi conduzido em pH 3, 5 e 8 por 2, 4 e 6 horas a temperatura de 25°C. As análises foram realizadas com amostras anteriores e posteriores à reação de ozonólise, investigando as alterações dos polissacarídeos e da lignina com as seguintes técnicas: MEV, Pi-GC/MS, CLAE, FT-IR e TGA. De acordo com a Microscospia eletrônica de varredura e Espectroscopia de infravermelho, foi possível observar a degradação dos componentes estruturais das fibras, em forma de “mola”, a partir de 4 horas de oxidação e alterações nas intensidades das bandas respecivamente. De acordo com a Pi-GC/MS, os derivados da lignina foram identificados e estabelecido uma relação S/G de 0,73 para fibra. O teor de lignina de Klason foi de 26,28% para a fibra e 25,45% para o parênquima. Em visto disso, chegou-se a conclusão que a melhor condição de tratamento com ozônio foi obtido com as fibras sem adição de reagente sob 4 horas de exposição ao agente oxidante, determinado pelo aumento do teor de glicose a 45,96%.por
dc.description.sponsorshipCAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superiorpor
dc.formatapplication/pdf*
dc.languageporpor
dc.publisherUniversidade Federal Rural do Rio de Janeiropor
dc.rightsAcesso Abertopor
dc.subjectcarboidratoeng
dc.subjectCoconut fibereng
dc.subjectozone treatmenteng
dc.subjectlignineng
dc.subjectcarbohydrateseng
dc.subjectFibra de cocopor
dc.subjectozonólisepor
dc.subjectligninapor
dc.titleProcesso de ozonólise aplicado ao aproveitamento tecnológico de resísuos de coco verdepor
dc.title.alternativeOzonolysis process applied to the technological use of green coconut wasteeng
dc.typeTesepor
dc.description.abstractOtherThe chemical analysis and structural analyzes of tropical biomass products has become a potential interest for the production of biofuels. Residues from coconut is promising because it doesn`t compete with the food industry and it can be transformed into a higher product added value due the lignocellulosic origin. Green coconuts had been separated between fiber and parenchyma following by anatomical characterization which it could better be understood and visualized the effect of pretreatment delignification; ozonolysis, with the chemical and compositional changes in the cell wall. To access the carbohydrates, lignin must be removed, thus it had been explored the changes induced by ozone under pH conditions; with addition of acetic acid and sodium hydroxide, and treatment time in milli-Q water. The ozonolysis was carried out at pH 3, 5 and 8 for 2; 4 and 6 hours at 25 ° C. Analyses were performed before and after the ozonolysis reaction to investigate the change of polysaccharides and lignin with the following techniques: SEM, Py-GC/MS, HPLC, FT-IR and TGA. With Scanning electron microscope and infrared spectroscopy, it was possible to observe the degradation of structural components of the fibers, in the form of "spring", from 4 hours of oxidation and changes in the intensities of the bands. According to the Py-GC/MS results, compounds resulting from lignin had been identified and stablished S/G ratio as 0,73. With a lignin Klason content of 26.28% from green coconut fiber and 25.45% from parenchyma. The best conditions of ozone treatment were determined to be the fiber with no addition of reagents for 4 hours under oxidation as determined by the increase of glucose content in the hydrolysate to 45.96 % after acid hydrolysis of ozone treated fibers.eng
dc.contributor.advisor1Lelis, Roberto Carlos Costa
dc.contributor.advisor1ID497.049.906-34por
dc.contributor.advisor1Latteshttp://lattes.cnpq.br/5175502780570226por
dc.contributor.advisor-co1Stevanovic, Tatjana
dc.contributor.advisor-co2castro, Rosane Nora
dc.contributor.advisor-co2ID9580673374por
dc.contributor.advisor-co2Latteshttp://lattes.cnpq.br/5479814788308057por
dc.contributor.referee1Muniz, Graciela Inês Bolzon de
dc.contributor.referee2Lopes, Claudio Rocha
dc.contributor.referee3Garcia, Rosilei A.
dc.contributor.referee4Nascimento, Alexandre Miguel do
dc.creator.ID105.090.647-01por
dc.creator.Latteshttp://lattes.cnpq.br/0048844467110922por
dc.publisher.countryBrasilpor
dc.publisher.departmentInstituto de Florestaspor
dc.publisher.initialsUFRRJpor
dc.publisher.programPrograma de Pós-Graduação em Ciências Ambientais e Florestaispor
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dc.subject.cnpqQuímicapor
dc.subject.cnpqQuímicapor
dc.subject.cnpqRecursos Florestais e Engenharia Florestalpor
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