Potential use of grape stems and pomaces from Touriga Nacional and Marselan cultivars as source of polyphenols and oligosaccharides

Bibliographic Details
Main Author: Mangione, Roberta
Publication Date: 2022
Format: Master thesis
Language: eng
Source: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
Download full: http://hdl.handle.net/10400.5/25471
Summary: Mestrado em Engenharia de Viticultura e Enologia (Double degree) / Instituto Superior de Agronomia. Universidade de Lisboa / Faculdade de Ciências. Universidade do Porto
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spelling Potential use of grape stems and pomaces from Touriga Nacional and Marselan cultivars as source of polyphenols and oligosaccharidespomacestemspolyphenolsoligosaccharidesautohydrolysisMestrado em Engenharia de Viticultura e Enologia (Double degree) / Instituto Superior de Agronomia. Universidade de Lisboa / Faculdade de Ciências. Universidade do PortoGrape pomace and stems, in addition to lees, are the main by-products of winemaking. They represent waste disposal, or they are used for wine alcohol production, as source of grapeseed oil, fertilizer, or for animal feed. However, these by-products are important sources of nutraceutical molecules with functional properties, including polyphenols with antioxidant activity. This study aimed to valorize these cellulosic materials from winemaking as source of bioactive phenolic compounds and to produce oligosaccharides with prebiotic activity. Grapes from Touriga Nacional and Marselan varieties (Vitis vinifera L.) were used for conventional red winemaking in the winery pilot plant of the Instituto Superior de Agronomia. The summative analysis was carried out to determine the chemical composition of the grape pomace (skins and seeds) and stems of both varieties: ash content, organic content as extractives (by sequential extraction in Soxhlet using dichloromethane, ethanol, and water), lignin fraction, and structural polysaccharides (cellulose and hemicelluloses). The amount of extractives was high and around 64.1% (d.w.) for both pomaces, and 46.2% and 59.5% for Marselan and Touriga Nacional stems. The main contribution came from polar compounds solubilized by ethanol and water, representing 82% of the total extractives, with total phenols contents ranging from 213.4 in Touriga Nacional stems to 457.1 g GAE/kg of dry material in Marselan pomaces. After extractives removal, the pomaces and stems were submitted to a hydrothermal treatment to get oligosaccharides from hemicelluloses. The autohydrolysis was carried out following a central composite rotatable design as a function of temperature (142-198°C) and time (48-132 min). For the materials of both varieties, the production of sugars by autohydrolysis showed to increase with reaction temperature and time. The highest sugar yields varied from 116.3 to 168.3 g of glucose/kg dry biomass. The autohydrolysis showed to be a feasible approach to obtain added-value oligosaccharides from hemicelluloses, from grape pomaces and stemss.n.Ferreira-Dias, SuzanaRicardo da Silva, Jorge ManuelRepositório da Universidade de LisboaMangione, Roberta20222025-09-01T00:00:00Z2022-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10400.5/25471TID:203082346engMangione, R. - Potential use of grape stems and pomaces from Touriga Nacional and Marselan cultivars as source of polyphenols and oligosaccharides. Lisboa: ISA, 2022, 75 p.info:eu-repo/semantics/embargoedAccessreponame:Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)instname:FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologiainstacron:RCAAP2025-03-17T16:05:32Zoai:repositorio.ulisboa.pt:10400.5/25471Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireinfo@rcaap.ptopendoar:https://opendoar.ac.uk/repository/71602025-05-29T04:02:29.826824Repositórios 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 Potential use of grape stems and pomaces from Touriga Nacional and Marselan cultivars as source of polyphenols and oligosaccharides
title Potential use of grape stems and pomaces from Touriga Nacional and Marselan cultivars as source of polyphenols and oligosaccharides
spellingShingle Potential use of grape stems and pomaces from Touriga Nacional and Marselan cultivars as source of polyphenols and oligosaccharides
Mangione, Roberta
pomace
stems
polyphenols
oligosaccharides
autohydrolysis
title_short Potential use of grape stems and pomaces from Touriga Nacional and Marselan cultivars as source of polyphenols and oligosaccharides
title_full Potential use of grape stems and pomaces from Touriga Nacional and Marselan cultivars as source of polyphenols and oligosaccharides
title_fullStr Potential use of grape stems and pomaces from Touriga Nacional and Marselan cultivars as source of polyphenols and oligosaccharides
title_full_unstemmed Potential use of grape stems and pomaces from Touriga Nacional and Marselan cultivars as source of polyphenols and oligosaccharides
title_sort Potential use of grape stems and pomaces from Touriga Nacional and Marselan cultivars as source of polyphenols and oligosaccharides
author Mangione, Roberta
author_facet Mangione, Roberta
author_role author
dc.contributor.none.fl_str_mv Ferreira-Dias, Suzana
Ricardo da Silva, Jorge Manuel
Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Mangione, Roberta
dc.subject.por.fl_str_mv pomace
stems
polyphenols
oligosaccharides
autohydrolysis
topic pomace
stems
polyphenols
oligosaccharides
autohydrolysis
description Mestrado em Engenharia de Viticultura e Enologia (Double degree) / Instituto Superior de Agronomia. Universidade de Lisboa / Faculdade de Ciências. Universidade do Porto
publishDate 2022
dc.date.none.fl_str_mv 2022
2022-01-01T00:00:00Z
2025-09-01T00:00:00Z
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/10400.5/25471
TID:203082346
url http://hdl.handle.net/10400.5/25471
identifier_str_mv TID:203082346
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Mangione, R. - Potential use of grape stems and pomaces from Touriga Nacional and Marselan cultivars as source of polyphenols and oligosaccharides. Lisboa: ISA, 2022, 75 p.
dc.rights.driver.fl_str_mv info:eu-repo/semantics/embargoedAccess
eu_rights_str_mv embargoedAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv s.n.
publisher.none.fl_str_mv s.n.
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
_version_ 1833601921537015808

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