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Chemical composition, antioxidant and antimicrobial activity of phenolic compounds extracted from wine industry by-products

2018Journal article Open access
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dc.contributor.authorSilva, Vanessa
dc.contributor.authorIgrejas, Gilberto
dc.contributor.authorFalco, Virgílio
dc.contributor.authorSantos, Teresa P.
dc.contributor.authorTorres, Carmen
dc.contributor.authorOliveira, Ana M.P.
dc.contributor.authorPereira, José Eduardo
dc.contributor.authorAmaral, Joana S.
dc.contributor.authorPoeta, Patrícia
dc.date.accessioned2018-02-19T10:00:00Z
dc.date.accessioned2019-02-04T17:06:12Z
dc.date.available2018-01-19T10:00:00Z
dc.date.available2019-02-04T17:06:12Z
dc.date.issued2018
dc.description.abstractWinery by-products are a rich source of polyphenols, which have proven to have several beneficial biological properties, such as, antioxidant and antimicrobial activities. Therefore, this study aimed the extraction of polyphenols from winery by-products of two Portuguese red grape varieties, Touriga Nacional and Preto Martinho, and evaluate their phenolic profile, antioxidant properties and antimicrobial activity against antibiotic resistant bacteria. The polyphenols were extracted from the grapes' skins, seeds and stems. Extracts were analysed for total phenolic, anthocyanin and tannin contents, and the polyphenol profile was determined by High Performance Liquid Chromatography. The antioxidant activity of the extracts was determined by ABTS+ and DPPH methods. Antimicrobial susceptibility assay was performed using Kirby-Bauer disc diffusion method. Preto Martinho variety presented a higher polyphenolic content than Touriga Nacional. Malvidin 3-O-glucoside was the most abundant compound found in the skins extracts in both varieties. The main phenolic compound found in the seeds and stems extracts was catechin. From the several flavonols quantified, rutin was the most abundant. For both varieties, the seeds extracts showed the highest antioxidant and antimicrobial properties, followed by the stems extracts. The extracts showed antibacterial activity against all tested strains except on gram-negative bacteria Salmonella enteritidis, Escherichia coli and Pseudomonas aeruginosa. These results show that, natural products, such as polyphenols, may represent a source for the development of novel antimicrobials to combat gram-positive resistant bacteria and possibly be used as natural food preservatives. However, they were not effective against gram-negative resistant bacteria which shows that polyphenols, alone, might not substitute antibiotics.
dc.description.versioninfo:eu-repo/semantics/publishedVersionen_EN
dc.identifier.citationSilva, Vanessa; Igrejas, Gilberto; Falco, Virgilio; Santos, Teresa P.; Torres, Carmen; Oliveira, Ana M.P.; Pereira, José Eduardo; Amaral, Joana S.; Poeta, Patrícia (2018). Chemical composition, antioxidant and antimicrobial activity of phenolic compounds extracted from wine industry by-products. Food Control. ISSN 0956-7135. 92, p. 516-522en_EN
dc.identifier.doi10.1016/j.foodcont.2018.05.031en_EN
dc.identifier.issn0956-7135
dc.identifier.urihttp://hdl.handle.net/10198/18706
dc.language.isoeng
dc.peerreviewedyesen_EN
dc.subjectAntibacterial activityen_EN
dc.subjectAntioxidant activityen_EN
dc.subjectPolyphenolsen_EN
dc.subjectResistant bacteriaen_EN
dc.subjectWinery by-productsen_EN
dc.titleChemical composition, antioxidant and antimicrobial activity of phenolic compounds extracted from wine industry by-productsen_EN
dc.typejournal article
dspace.entity.typePublication
person.familyNameAmaral
person.givenNameJoana S.
person.identifier.ciencia-id5319-7DE8-BEDA
person.identifier.orcid0000-0002-3648-7303
rcaap.rightsopenAccessen_EN
rcaap.typearticleen_EN
relation.isAuthorOfPublication42be2cf4-adc4-4e7f-ac60-7aab515b38cd
relation.isAuthorOfPublication.latestForDiscovery42be2cf4-adc4-4e7f-ac60-7aab515b38cd

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