Deconstruction of plant biomass by autohydrolysis
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Tipo de documento: | Dissertação |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10773/14304 |
Resumo: | The search for better technologies for upgrading biomass wastes has received increasing attention in the recent years. Special consideration has to be given to the hemicellulosic fraction, one of the more challenging fractions. In this work, two biologically different waste materials were iorefinery concept: the materials derived from the forestry processing of the cypress cedar of Goa (Cupressus lusitanica Mill.), namely chips, bark, leaves and cones, and the wastes of the watermelon (Citrullus lanatus) industrial processing (rinds). The chemical composition of all materials was characterized taking special attention to the extractives content and to the structural polysaccharides and lignin and the autohydrolysis process was optimized aiming for the production of novel oligosaccharides. The autohydrolysis process presented a high selectivity towards hemicelluloses, yielding oligosaccharides in high concentrations, especially for the chips of cypress cedar of Goa. The oligosaccharides were characterized regarding their chemical composition and their stability under different temperature and pH values. Their potential industrial applications, namely for the food industry, are also presented and discussed. As a preliminary evaluation of the integrated upgrade of these materials, the use of biomass from cypress cedar of Goa as a source of essential oils and the digestibility of the cellulose present in the residual biomass derived from the autohydrolysis treatments as a source of glucose for fermentation were also tested and are discussed. |
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Deconstruction of plant biomass by autohydrolysisQuímica analíticaEnergias renováveisBiomassa - RefinaçãoHidróliseHemiceluloseLenhoceluloseOligossacarídeosThe search for better technologies for upgrading biomass wastes has received increasing attention in the recent years. Special consideration has to be given to the hemicellulosic fraction, one of the more challenging fractions. In this work, two biologically different waste materials were iorefinery concept: the materials derived from the forestry processing of the cypress cedar of Goa (Cupressus lusitanica Mill.), namely chips, bark, leaves and cones, and the wastes of the watermelon (Citrullus lanatus) industrial processing (rinds). The chemical composition of all materials was characterized taking special attention to the extractives content and to the structural polysaccharides and lignin and the autohydrolysis process was optimized aiming for the production of novel oligosaccharides. The autohydrolysis process presented a high selectivity towards hemicelluloses, yielding oligosaccharides in high concentrations, especially for the chips of cypress cedar of Goa. The oligosaccharides were characterized regarding their chemical composition and their stability under different temperature and pH values. Their potential industrial applications, namely for the food industry, are also presented and discussed. As a preliminary evaluation of the integrated upgrade of these materials, the use of biomass from cypress cedar of Goa as a source of essential oils and the digestibility of the cellulose present in the residual biomass derived from the autohydrolysis treatments as a source of glucose for fermentation were also tested and are discussed.A procura pelo melhor aproveitamento da biomassa vegetal tem vindo a despertar o interesse no uso racional de todos os seus componentes, tendo de se dar especial atenção à valorização das hemiceluloses, uma das frações mais desafiantes. Neste trabalho selecionaram-se dois resíduos vegetais, a biomassa do Cipreste-Português ou Falso-Cedro-do-Buçaco (Cupressus lusitanica Mill.) tendo-se estudado os seus principais constituintes (madeira, casca, folhas e gálbulas) e as cascas de melancia (Citrullus lanatus), principal resíduo da potencial utilização industrial deste fruto. Estudou-se a composição química dos diferentes materiais e otimizou-se o processo de auto-hidrólise para a produção de oligossacarídeos com potenciais novas funcionalidades. Os resultados demonstram a elevada seletividade do processo de auto-hidrólise para a remoção das hemiceluloses, principalmente para a estilha do Cipreste-Português, tendo-se obtido elevadas concentrações de oligossacarídeos. Os diferentes oligossacarídeos foram caracterizados relativamente à sua composição e estabilidade química sob diferentes temperaturas e valores de pH e discute-se a sua potencialidade para aplicações na indústria alimentar. Por forma a perspetivar uma valorização integrada dos materiais no conceito da biorrefinaria, estudou-se ainda a utilização da biomassa de Cipreste-Português como fonte de óleos essenciais e a digestibilidade enzimática da celulose presente na biomassa residual obtida do processo de auto-hidrólise como método de recuperação de glucose para fins fermentativos.Universidade de Aveiro2018-07-20T14:00:49Z2014-09-09T00:00:00Z2014-09-092016-09-09T14:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10773/14304TID:201592215engCarlos, Rute das Neves Sarabandoinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-17T03:39:23ZPortal AgregadorONG |
dc.title.none.fl_str_mv |
Deconstruction of plant biomass by autohydrolysis |
title |
Deconstruction of plant biomass by autohydrolysis |
spellingShingle |
Deconstruction of plant biomass by autohydrolysis Carlos, Rute das Neves Sarabando Química analítica Energias renováveis Biomassa - Refinação Hidrólise Hemicelulose Lenhocelulose Oligossacarídeos |
title_short |
Deconstruction of plant biomass by autohydrolysis |
title_full |
Deconstruction of plant biomass by autohydrolysis |
title_fullStr |
Deconstruction of plant biomass by autohydrolysis |
title_full_unstemmed |
Deconstruction of plant biomass by autohydrolysis |
title_sort |
Deconstruction of plant biomass by autohydrolysis |
author |
Carlos, Rute das Neves Sarabando |
author_facet |
Carlos, Rute das Neves Sarabando |
author_role |
author |
dc.contributor.author.fl_str_mv |
Carlos, Rute das Neves Sarabando |
dc.subject.por.fl_str_mv |
Química analítica Energias renováveis Biomassa - Refinação Hidrólise Hemicelulose Lenhocelulose Oligossacarídeos |
topic |
Química analítica Energias renováveis Biomassa - Refinação Hidrólise Hemicelulose Lenhocelulose Oligossacarídeos |
description |
The search for better technologies for upgrading biomass wastes has received increasing attention in the recent years. Special consideration has to be given to the hemicellulosic fraction, one of the more challenging fractions. In this work, two biologically different waste materials were iorefinery concept: the materials derived from the forestry processing of the cypress cedar of Goa (Cupressus lusitanica Mill.), namely chips, bark, leaves and cones, and the wastes of the watermelon (Citrullus lanatus) industrial processing (rinds). The chemical composition of all materials was characterized taking special attention to the extractives content and to the structural polysaccharides and lignin and the autohydrolysis process was optimized aiming for the production of novel oligosaccharides. The autohydrolysis process presented a high selectivity towards hemicelluloses, yielding oligosaccharides in high concentrations, especially for the chips of cypress cedar of Goa. The oligosaccharides were characterized regarding their chemical composition and their stability under different temperature and pH values. Their potential industrial applications, namely for the food industry, are also presented and discussed. As a preliminary evaluation of the integrated upgrade of these materials, the use of biomass from cypress cedar of Goa as a source of essential oils and the digestibility of the cellulose present in the residual biomass derived from the autohydrolysis treatments as a source of glucose for fermentation were also tested and are discussed. |
publishDate |
2014 |
dc.date.none.fl_str_mv |
2014-09-09T00:00:00Z 2014-09-09 2016-09-09T14:00:00Z 2018-07-20T14:00:49Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10773/14304 TID:201592215 |
url |
http://hdl.handle.net/10773/14304 |
identifier_str_mv |
TID:201592215 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade de Aveiro |
publisher.none.fl_str_mv |
Universidade de Aveiro |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
|
repository.mail.fl_str_mv |
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_version_ |
1777303510831857664 |