Intereferents in condensed tannins quantification by the vanillin assay

Detalhes bibliográficos
Autor(a) principal: Mavrikou, Ioanna
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/10400.5/8616
Resumo: Mestrado Vinifera EuroMaster - Instituto Superior de Agronomia
id RCAP_9ec099e8253e6d753a7299ae7633fd64
oai_identifier_str oai:www.repository.utl.pt:10400.5/8616
network_acronym_str RCAP
network_name_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository_id_str 7160
spelling Intereferents in condensed tannins quantification by the vanillin assayproanthocyanidinsinterference substancesphenolsvanillin assayMestrado Vinifera EuroMaster - Instituto Superior de AgronomiaDifferent methods have been established in order to perform accurately the quantification of the condensed tannins in various plant products and beverages. The method of reaction in acid medium has been widely used for the quantification of condensed tannins. This method is based on the reaction of vanillin with the phenolic rings of condensed tannins and more specifically with the fusel aromatic rings of their flavan-3-ol units. In a previous study (Sun et al., 1998), several parameters that can affect the accuracy of the determination of condensed tannins have been examined by this method, and among them the influence of phenolic compounds other than tannins, in particular non-flavonoids such as phenolic acids (cinnamic acid, p-hydroxybenzoic acid, caffeic acid, gallic acid, p-coumaric acid, syringic acid), but also flavonols (quercetin dihydrate, kaempferol, myricetin, rutin) and the anthocyanin malvidin-3-glucoside; that may interfere the reaction of proanthocyanidins with vanillin assay. According to this analytical procedure proposed by Sun et al. (1998), other phenolic compounds of oenological interest not tested so far were analyzed to assess their possible interference with the reaction of proanthocyanidins in its quantification by the vanillin assay. In details, the phenolic compounds that have been studied were flavonols and flavones, stilbenes, various volatile phenols, and other phenols from wood such as ellagitannins, coumarins, aldehydes and still other compounds such as tyrosol and 2-phenylethanol. The chemical compounds examined at different concentrations did not produce any reaction with the vanillin. Therefore, the modified vanillin assay can be interpreted as a method for quantification of condensed tannins in grape and wine samples without any important analytical interference from other compounds not condensed tanninsISA/ULSilva, Jorge Manuel RicardoRepositório da Universidade de LisboaMavrikou, Ioanna2015-12-31T01:30:11Z20122012-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10400.5/8616engMavrikou, I. - Intereferents in condensed tannins quantification by the vanillin assay. Lisboa: ISA, 2012, 70 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:RCAAP2023-12-24T01:32:24Zoai:www.repository.utl.pt:10400.5/8616Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T16:55:34.793907Repositório 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 Intereferents in condensed tannins quantification by the vanillin assay
title Intereferents in condensed tannins quantification by the vanillin assay
spellingShingle Intereferents in condensed tannins quantification by the vanillin assay
Mavrikou, Ioanna
proanthocyanidins
interference substances
phenols
vanillin assay
title_short Intereferents in condensed tannins quantification by the vanillin assay
title_full Intereferents in condensed tannins quantification by the vanillin assay
title_fullStr Intereferents in condensed tannins quantification by the vanillin assay
title_full_unstemmed Intereferents in condensed tannins quantification by the vanillin assay
title_sort Intereferents in condensed tannins quantification by the vanillin assay
author Mavrikou, Ioanna
author_facet Mavrikou, Ioanna
author_role author
dc.contributor.none.fl_str_mv Silva, Jorge Manuel Ricardo
Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Mavrikou, Ioanna
dc.subject.por.fl_str_mv proanthocyanidins
interference substances
phenols
vanillin assay
topic proanthocyanidins
interference substances
phenols
vanillin assay
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/10400.5/8616
url http://hdl.handle.net/10400.5/8616
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Mavrikou, I. - Intereferents in condensed tannins quantification by the vanillin assay. Lisboa: ISA, 2012, 70 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
_version_ 1799131034594312192

Registros relacionados