The Effect of Drying Process on Undervalued Brown and Red Seaweed Species: Biochemical Characterization

Bibliographic Details
Main Author: Julião, Diana Rodrigues
Publication Date: 2020
Format: Master thesis
Language: eng
Source: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
Download full: http://hdl.handle.net/10362/114350
Summary: Some of the results presented in this document were submitted to the international journal of Phycological Research for publication and are currently under revision (Annex I).
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spelling The Effect of Drying Process on Undervalued Brown and Red Seaweed Species: Biochemical CharacterizationAsparagopsisCystoseiraBioaccessibilityAntioxidantAnti-inflammatoryDomínio/Área Científica::Engenharia e Tecnologia::Engenharia QuímicaSome of the results presented in this document were submitted to the international journal of Phycological Research for publication and are currently under revision (Annex I).The effect of drying on two brown seaweed (Cystoseira abies-marina, Cystoseira humilis) and two red seaweed species (Asparagopsis armata, Asparagopsis taxiformis), collected from the Azores Archipelago, was evaluated through the study of their proximate and mineral composition, relevant biological activities, such as antioxidant and anti-inflammatory properties, and significant bioactives, namely polyphenols and beta-glucans. Ash and protein content ranged from 25-56 g/100g dw and 3.5-13.1 g/100g dw, respectively. Sun-dried C. humilis had the highest moisture decrease. Concerning insoluble dietary fibre content, the genus Cystoseira presented superior concentrations (43.7-53.6 g/100g dw). Contrarily, the soluble dietary fibre content is superior in the Asparagopsis genus (8.0-13.2 g/100g dw). For the proximate composition, no significant differences were detected concerning the drying procedure. Seaweeds from the Cystoseira genus showed high polyphenol levels (176-678mg GAE/100 g dw), exceeding those determined in the Asparagopsis genus, regardless of drying process. This was partially reflected in the antioxidant activity, which showed that extracts from the Cystoseira species were often more antioxidant than those from Asparagopsis species. The influence of the drying technique upon the antioxidant activity was limited, since in many instances there was no effect. Concerning anti-inflammatory activity, in the case of shade-dried samples, C. humilis had a higher activity (>30% COX-2 inhibition) but was not rendered bioaccessible. Indeed, only A. taxiformis displayed anti-inflammatory activity in the bioaccessible fraction, leading to bioaccessibility factors in the 90-100% range. Therefore, though bioactivities were higher in the Cystoseira species, Asparagopsis species also had a positive bioactive potential. Sun-drying produced more negative effects than shade-drying, despite not being very extensive. Regarding elemental composition, iodine was present in a considerable amount in the Asparagopsis genus. Iron had high concentrations in the four species. Regarding contaminants, Cystoseira abies-marina showed high arsenic concentrations. Iodine, bromine, magnesium, and cadmium showed the highest bioaccessibility percentages.Cardoso, CarlosBranco, PaulaRUNJulião, Diana Rodrigues2021-03-24T11:31:18Z2021-0220202021-02-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10362/114350enginfo:eu-repo/semantics/openAccessreponame:Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)instname:FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologiainstacron:RCAAP2024-05-22T17:51:21Zoai:run.unl.pt:10362/114350Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireinfo@rcaap.ptopendoar:https://opendoar.ac.uk/repository/71602025-05-28T17:22:33.650841Repositórios Científicos de Acesso Aberto de Portugal (RCAAP) - FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologiafalse
dc.title.none.fl_str_mv The Effect of Drying Process on Undervalued Brown and Red Seaweed Species: Biochemical Characterization
title The Effect of Drying Process on Undervalued Brown and Red Seaweed Species: Biochemical Characterization
spellingShingle The Effect of Drying Process on Undervalued Brown and Red Seaweed Species: Biochemical Characterization
Julião, Diana Rodrigues
Asparagopsis
Cystoseira
Bioaccessibility
Antioxidant
Anti-inflammatory
Domínio/Área Científica::Engenharia e Tecnologia::Engenharia Química
title_short The Effect of Drying Process on Undervalued Brown and Red Seaweed Species: Biochemical Characterization
title_full The Effect of Drying Process on Undervalued Brown and Red Seaweed Species: Biochemical Characterization
title_fullStr The Effect of Drying Process on Undervalued Brown and Red Seaweed Species: Biochemical Characterization
title_full_unstemmed The Effect of Drying Process on Undervalued Brown and Red Seaweed Species: Biochemical Characterization
title_sort The Effect of Drying Process on Undervalued Brown and Red Seaweed Species: Biochemical Characterization
author Julião, Diana Rodrigues
author_facet Julião, Diana Rodrigues
author_role author
dc.contributor.none.fl_str_mv Cardoso, Carlos
Branco, Paula
RUN
dc.contributor.author.fl_str_mv Julião, Diana Rodrigues
dc.subject.por.fl_str_mv Asparagopsis
Cystoseira
Bioaccessibility
Antioxidant
Anti-inflammatory
Domínio/Área Científica::Engenharia e Tecnologia::Engenharia Química
topic Asparagopsis
Cystoseira
Bioaccessibility
Antioxidant
Anti-inflammatory
Domínio/Área Científica::Engenharia e Tecnologia::Engenharia Química
description Some of the results presented in this document were submitted to the international journal of Phycological Research for publication and are currently under revision (Annex I).
publishDate 2020
dc.date.none.fl_str_mv 2020
2021-03-24T11:31:18Z
2021-02
2021-02-01T00:00:00Z
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/10362/114350
url http://hdl.handle.net/10362/114350
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:Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
instname:FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
instacron:RCAAP
instname_str FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
instacron_str RCAAP
institution RCAAP
reponame_str Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
collection Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
repository.name.fl_str_mv Repositórios Científicos de Acesso Aberto de Portugal (RCAAP) - FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
repository.mail.fl_str_mv info@rcaap.pt
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