Edible coatings based on chitosan-beeswax emulsions

Detalhes bibliográficos
Autor(a) principal: Marques, Sónia Cristina Pereira
Data de Publicação: 2012
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10362/8184
Resumo: Dissertação para obtenção do Grau de Mestre em Engenharia Química e Bioquímica
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spelling Edible coatings based on chitosan-beeswax emulsionsEdible films and coatingsChitosan filmsBeeswax emulsionsBarrier propertiesDissertação para obtenção do Grau de Mestre em Engenharia Química e BioquímicaThe use of edible biopolymer-based films and coatings is an environmentally friendly technology that offers substantial advantages for increase of shelf-life of many food products including fruits and vegetables. The development of this kind of films and coatings is a technological challenge for the industry and a very active research field worldwide. In this work biodegradable edible films of chitosan with different contents of beeswax were prepared and characterized. Their hygroscopic properties and water vapour permeability, as well as their CO2 and O2 permeability, mechanical, optical and superficial properties were determined. All the obtained films are transparent with a slightly yellowish colour. They are homogeneous and dense, despite the films with beeswax presented some cracks and depressions in their structure. The incorporation of beeswax increases the films hydrophobicity, higher contact angle values, but still prevails their hydrophilic nature. Regarding the mechanical properties, these films are flexible and elastic, but the increase of beeswax content increases their brittleness. The films showed decreased water vapour permeability as well as decreased hydrophilic properties, with the increase of beeswax content. The sorption and diffusion coefficients were evaluated for water vapour transport. The permeability decrease was mainly due to the reduction of the diffusion coefficient. A reduction of the water vapour permeability and a significant reduction in oxygen permeability were achieved with the inclusion of beeswax in the polymeric matrix. Comparing to the films without beeswax, the water vapour permeability decreased 32% and the oxygen permeability 90% for the films with 10% beeswax. Regarding the carbon dioxide permeability, it increased about 240% for the films with 10% beeswax. From the results, it is thought that these films are promising to be used in food packaging mainly for fruits and vegetable coating, mainly due to their barrier properties that allow the products to breathe and inhibit the oxidation process.Faculdade de Ciências e TecnologiaCoelhoso, IsabelAlves, VítorRUNMarques, Sónia Cristina Pereira2012-11-23T11:04:12Z20122012-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10362/8184enginfo: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:RCAAP2024-03-11T03:40:41Zoai:run.unl.pt:10362/8184Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:18:00.157867Repositório 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 Edible coatings based on chitosan-beeswax emulsions
title Edible coatings based on chitosan-beeswax emulsions
spellingShingle Edible coatings based on chitosan-beeswax emulsions
Marques, Sónia Cristina Pereira
Edible films and coatings
Chitosan films
Beeswax emulsions
Barrier properties
title_short Edible coatings based on chitosan-beeswax emulsions
title_full Edible coatings based on chitosan-beeswax emulsions
title_fullStr Edible coatings based on chitosan-beeswax emulsions
title_full_unstemmed Edible coatings based on chitosan-beeswax emulsions
title_sort Edible coatings based on chitosan-beeswax emulsions
author Marques, Sónia Cristina Pereira
author_facet Marques, Sónia Cristina Pereira
author_role author
dc.contributor.none.fl_str_mv Coelhoso, Isabel
Alves, Vítor
RUN
dc.contributor.author.fl_str_mv Marques, Sónia Cristina Pereira
dc.subject.por.fl_str_mv Edible films and coatings
Chitosan films
Beeswax emulsions
Barrier properties
topic Edible films and coatings
Chitosan films
Beeswax emulsions
Barrier properties
description Dissertação para obtenção do Grau de Mestre em Engenharia Química e Bioquímica
publishDate 2012
dc.date.none.fl_str_mv 2012-11-23T11:04:12Z
2012
2012-01-01T00:00:00Z
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/10362/8184
url http://hdl.handle.net/10362/8184
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 Faculdade de Ciências e Tecnologia
publisher.none.fl_str_mv Faculdade de Ciências e Tecnologia
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
_version_ 1799137826675097600

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