Physical stability of a Lactose-Trehalose matrix for nano-encapsulation of beta-carotene by spray drying

Detalhes bibliográficos
Autor(a) principal: Barreto, Hugo Ricardo Dias
Data de Publicação: 2008
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.5/874
Resumo: Mestrado em Engenharia Alimentar - Instituto Superior de Agronomia
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spelling Physical stability of a Lactose-Trehalose matrix for nano-encapsulation of beta-carotene by spray dryingencapsulationglass transitionDSCDMADEAencapsulamentotransição vitreaMestrado em Engenharia Alimentar - Instituto Superior de AgronomiaThe purpose of this work was to study the physical properties of a model sugar system of lactose and trehalose, related to its potential as an encapsulation matrix. The encapsulation was accomplished by spray-drying of an oil-in-water emulsion, with an oil phase with high content of β-carotene, representing the encapsulated molecule. This study aimed to relate the water content of the matrix sugars with the variation of the glass transition temperature (Tg) and the occurrence of crystallization over time. The influence of these changes on the structure of the rehydrated emulsion and the carotene content of the powder were also to be assessed. Characterization of physical changes was made by describing sorption behaviour, physical structure of the reconstituted emulsion from the encapsulate, determination of the thermal transition by DSC, DMA and DEA, and microscopical observation of the stored spraydried powder. It was shown that the matrix remains stable if kept under an aw of 0.33 or lower. Higher figures may lower the glass transition to below room temperature, causing spontaneous crystallization and collapse of the matrix structure, thus affecting the flowability of the encapsulate and exposing carotene to the environment. Sorption data of the spray-dried powder fitted fairly to the BET and GAB isotherms, indicating a monolayer moisture of 4.64% and 3.21%, respectively. DSC analysis on lactosetrehalose model sugar systems showed a glass transition temperature of 107.9ºC for anhydrous sample, 55.2ºC for 11% RVP storage and 30,2ºC for 33% RVP. These results could not be correlated to the results from DMA and DEA analysis, due to the highly irregular results shown by these methods. It is suggested that these methods are inadequate for hydrated samples with high Tg. The droplet sizes obtained with ultra-high pressure homogenization, and the physical stability of the lactose-trehalose amorphous matrix are satisfactory. However, it is still necessary to study the encapsulation efficiency of this matrix on this kind of core material, with more appropriate quantitative methods. As for DMA and DEA analysis, further development of the method is needed to establish a reliable relation with the DSC results.Beirão da Costa, Maria LuísaRoos, Yrjo H.Repositório da Universidade de LisboaBarreto, Hugo Ricardo Dias2009-04-24T14:08:58Z20082008-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10400.5/874enginfo: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:RCAAP2023-03-06T14:32:09Zoai:www.repository.utl.pt:10400.5/874Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T16:49:06.795483Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Physical stability of a Lactose-Trehalose matrix for nano-encapsulation of beta-carotene by spray drying
title Physical stability of a Lactose-Trehalose matrix for nano-encapsulation of beta-carotene by spray drying
spellingShingle Physical stability of a Lactose-Trehalose matrix for nano-encapsulation of beta-carotene by spray drying
Barreto, Hugo Ricardo Dias
encapsulation
glass transition
DSC
DMA
DEA
encapsulamento
transição vitrea
title_short Physical stability of a Lactose-Trehalose matrix for nano-encapsulation of beta-carotene by spray drying
title_full Physical stability of a Lactose-Trehalose matrix for nano-encapsulation of beta-carotene by spray drying
title_fullStr Physical stability of a Lactose-Trehalose matrix for nano-encapsulation of beta-carotene by spray drying
title_full_unstemmed Physical stability of a Lactose-Trehalose matrix for nano-encapsulation of beta-carotene by spray drying
title_sort Physical stability of a Lactose-Trehalose matrix for nano-encapsulation of beta-carotene by spray drying
author Barreto, Hugo Ricardo Dias
author_facet Barreto, Hugo Ricardo Dias
author_role author
dc.contributor.none.fl_str_mv Beirão da Costa, Maria Luísa
Roos, Yrjo H.
Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Barreto, Hugo Ricardo Dias
dc.subject.por.fl_str_mv encapsulation
glass transition
DSC
DMA
DEA
encapsulamento
transição vitrea
topic encapsulation
glass transition
DSC
DMA
DEA
encapsulamento
transição vitrea
description Mestrado em Engenharia Alimentar - Instituto Superior de Agronomia
publishDate 2008
dc.date.none.fl_str_mv 2008
2008-01-01T00:00:00Z
2009-04-24T14:08:58Z
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/10400.5/874
url http://hdl.handle.net/10400.5/874
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.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 Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
repository.mail.fl_str_mv
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