Determination of ortho- and retronasal detection and recognition thresholds for off-favours in wine

Detalhes bibliográficos
Autor(a) principal: Domingos, Ana Sofia Martins
Data de Publicação: 2019
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.5/18370
Resumo: Mestrado em Viticultura e Enologia - Instituto Superior de Agronomia - UL / Faculdade de Ciências - Universidade do Porto
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spelling Determination of ortho- and retronasal detection and recognition thresholds for off-favours in winewine off-flavoursthresholdsuprathreshold intensityorthonasalretronasalMestrado em Viticultura e Enologia - Instituto Superior de Agronomia - UL / Faculdade de Ciências - Universidade do PortoThe research performed in this thesis had as overall objective to fill the gap in the current literature about flavour thresholds and sensitivity to suprathreshold concentrations. Two groups of tasters were used, one comprised by 15 novices (student panel) and the other by 16 wine experts (professional panel). Detection (DT) and recognition (RT) thresholds were established in wine for six common off-flavour compounds when present in high concentration: acetaldehyde, acetic acid, ethyl acetate, hexanol, hydrogen sulfide and volatile phenols. Thresholds were evaluated orthonasally (ON) and retronasally (RN) by each participant, using the standardized procedures based on the ascending forced-choice (3-AFC) triangular tests. The suprathreshold intensity was obtained ON and RN after testing three measures of individual responsiveness: geometric mean (GM), area-under-curve (AUC) and slope of the response regression line. DT and RT thresholds yielded overall results within the range reported in literature. Interestingly, in both threshold and suprathreshold tests, contrary to predictions based on reports of an association between expertise and improvement of the olfactory and gustatory sensitivity, the thresholds for the same molecules were similar between tasting panels, indicating that sensitivities were practically not affected by expertise. The relationship between threshold and suprathreshold intensities was also studied. In most cases there was not a relationship, implying that a low threshold does not necessarily lead to greater sensations elicited by suprathreshold concentrations. On the other hand, the results suggested that some subjects perceived the molecules differently on both orthonasal and retronasal pathways, presenting higher variability on the orthonasal evaluation comparing with the retronasal one. Overall, results highlighted the high variability of individual olfactory responses and the importance of the retronasal pathway on the assessment of off-flavours in winesISA/ULMalfeito Ferreira, ManuelRepositório da Universidade de LisboaDomingos, Ana Sofia Martins2019-09-27T11:22:21Z20192019-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10400.5/18370TID:203082621engDimingos, A.S.M. - Determination of ortho- and retronasal detection and recognition thresholds for off-favours in wine. Lisboa: ISA, 2019, 79 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:RCAAP2023-03-06T14:47:57Zoai:www.repository.utl.pt:10400.5/18370Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T17:03:25.880304Repositório 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 Determination of ortho- and retronasal detection and recognition thresholds for off-favours in wine
title Determination of ortho- and retronasal detection and recognition thresholds for off-favours in wine
spellingShingle Determination of ortho- and retronasal detection and recognition thresholds for off-favours in wine
Domingos, Ana Sofia Martins
wine off-flavours
threshold
suprathreshold intensity
orthonasal
retronasal
title_short Determination of ortho- and retronasal detection and recognition thresholds for off-favours in wine
title_full Determination of ortho- and retronasal detection and recognition thresholds for off-favours in wine
title_fullStr Determination of ortho- and retronasal detection and recognition thresholds for off-favours in wine
title_full_unstemmed Determination of ortho- and retronasal detection and recognition thresholds for off-favours in wine
title_sort Determination of ortho- and retronasal detection and recognition thresholds for off-favours in wine
author Domingos, Ana Sofia Martins
author_facet Domingos, Ana Sofia Martins
author_role author
dc.contributor.none.fl_str_mv Malfeito Ferreira, Manuel
Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Domingos, Ana Sofia Martins
dc.subject.por.fl_str_mv wine off-flavours
threshold
suprathreshold intensity
orthonasal
retronasal
topic wine off-flavours
threshold
suprathreshold intensity
orthonasal
retronasal
description Mestrado em Viticultura e Enologia - Instituto Superior de Agronomia - UL / Faculdade de Ciências - Universidade do Porto
publishDate 2019
dc.date.none.fl_str_mv 2019-09-27T11:22:21Z
2019
2019-01-01T00:00:00Z
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/10400.5/18370
TID:203082621
url http://hdl.handle.net/10400.5/18370
identifier_str_mv TID:203082621
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Dimingos, A.S.M. - Determination of ortho- and retronasal detection and recognition thresholds for off-favours in wine. Lisboa: ISA, 2019, 79 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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