Animal proteins used as fining agents and their influence on the anthocyanins' profile

Detalhes bibliográficos
Autor(a) principal: Georgilas, Athanasios-Panagiotis
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/10400.5/8610
Resumo: Mestrado Vinifera EuroMaster - Instituto Superior de Agronomia
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spelling Animal proteins used as fining agents and their influence on the anthocyanins' profilefining agentmonomeric anthocyaninstanninswinepigmentsclarificationMestrado Vinifera EuroMaster - Instituto Superior de AgronomiaThe treatment of wine with fining agents is a common practice in the wine industry which aims to achieve wine’s clarity and improves its stability along the time. The objective of this work was to examine the influence of various animal proteins used as fining agents on the anthocyanins’ profile. For this experiment, two Portuguese varieties, Touriga Nacional and Trincadeira have been used in which two different concentrations have been applied for each fining product. The fining agents are commercial fining products widely used in the wine industry such as Egg Albumin, Isinglass, PVPP, Gelatin, Casesol. These proteins were added in the wines in order to perceive the effect of the adding protein and other fining agents on the wine’s anthocyanidins final composition, since that these monomeric anthocyanins have an important function on the sensory characteristics of wines, such as colour. The clarification process lasted 7 days for each fining product. At the end of each clarification period, monomeric anthocyanin analysis was carried out by HPLC. By the analysis in the HPLC, we perceived that in general the biggest impact from all the fining agents is displayed to the acylated and coumarylated derivatives of the monomeric anthocyanins rather than the 3-glucoside antocyanidins. Having this as a fact and learning through the initial analysis that Touriga Nacional is richer in these two groups rather than in glucoside derivatives we are able to explain why Touriga Nacional was more affected in all the fining treatments compared to Trincadeira that is poorer in acylated derivatives and in general it was less influenced by the fining agents. Moreover, further analysis have been carried out in order to examine the influence of the fining agents on the concentration of pigments, the quantity of condensed tannins as well as on the chromatic characteristics of the wine after fining. For the quantity of condensed tannins after fining, the results have shown that all the fining agents promoted a reduction on the final quantity of tannins after the treatments whereas for the pigments and colour intensity the impact was notably lower compared with the tannins. Regarding the impact on the colour anthocyanins, Casesol promoted the greatest influence on their quantity. In addition, the general tendency indicates that the fining products in high concentrations provoke a bigger decrease on the amount of total anthocyanins compared with the small concentrationsISA/ULLaureano, OlgaRepositório da Universidade de LisboaGeorgilas, Athanasios-Panagiotis2015-12-31T01:30:11Z20122012-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10400.5/8610engGeorgilas, A.-P. - Animal proteins used as fining agents and their influence on the anthocyanins' profile. Lisboa: ISA, 2012, 72 p.info: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:RCAAP2023-12-24T01:32:23Zoai:www.repository.utl.pt:10400.5/8610Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T16:55:34.523923Repositório 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 Animal proteins used as fining agents and their influence on the anthocyanins' profile
title Animal proteins used as fining agents and their influence on the anthocyanins' profile
spellingShingle Animal proteins used as fining agents and their influence on the anthocyanins' profile
Georgilas, Athanasios-Panagiotis
fining agent
monomeric anthocyanins
tannins
wine
pigments
clarification
title_short Animal proteins used as fining agents and their influence on the anthocyanins' profile
title_full Animal proteins used as fining agents and their influence on the anthocyanins' profile
title_fullStr Animal proteins used as fining agents and their influence on the anthocyanins' profile
title_full_unstemmed Animal proteins used as fining agents and their influence on the anthocyanins' profile
title_sort Animal proteins used as fining agents and their influence on the anthocyanins' profile
author Georgilas, Athanasios-Panagiotis
author_facet Georgilas, Athanasios-Panagiotis
author_role author
dc.contributor.none.fl_str_mv Laureano, Olga
Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Georgilas, Athanasios-Panagiotis
dc.subject.por.fl_str_mv fining agent
monomeric anthocyanins
tannins
wine
pigments
clarification
topic fining agent
monomeric anthocyanins
tannins
wine
pigments
clarification
description Mestrado Vinifera EuroMaster - Instituto Superior de Agronomia
publishDate 2012
dc.date.none.fl_str_mv 2012
2012-01-01T00:00:00Z
2015-12-31T01:30:11Z
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/10400.5/8610
url http://hdl.handle.net/10400.5/8610
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Georgilas, A.-P. - Animal proteins used as fining agents and their influence on the anthocyanins' profile. Lisboa: ISA, 2012, 72 p.
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 ISA/UL
publisher.none.fl_str_mv ISA/UL
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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