Browsing by Author "Antunes, Alexandra M.M."
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- Casting light on the chemical characterization of acacia podsPublication . Pedro, Soraia; Fernandes, Tiago A.; Antunes, Alexandra M.M.; Gominho, Jorge; Gallardo, Eugenia; Anjos, O.Invasive species impose a strain on natural ecosystems by contributing to the loss of certain native species. Acacia species are amongst the most aggressive invasive species in Portugal. In this work, Acacia retinodes, A. longifolia, A. melanoxylon, A. pycnantha and A. dealbata pods were studied concerning the extraction of compounds for potential industrial application.
- Comparative analysis of the phytochemical profiles in the flowers and pods of Acacia mearnsiiPublication . Pedro, Soraia; Fernandes, Tiago A.; Antunes, Alexandra M.M.; Gonçalves, José Carlos; Gominho, Jorge; Gallardo, Eugenia; Anjos, O.As espécies do género Acacia são plantas invasoras e extremamente agressivas em vários territórios, representando uma ameaça significativa à biodiversidade e ao equilíbrio dos ecossistemas. Alguns estudos têm sido realizados sobre a composição e atividade biológica em diferentes partes da árvore. Este trabalho tem como objetivo caracterizar extratos de Acacia mearnsii para potencial aplicação industrial.
- First chemical profile analysis of acacia podsPublication . Pedro, Soraia; Fernandes, Tiago A.; Luís, Ângelo; Antunes, Alexandra M.M.; Gonçalves, José Carlos; Gominho, Jorge; Gallardo, Eugenia; Anjos, O.This study intended to evaluate the potential industrial applications of various Acacia species (Acacia melanoxylon, Acacia longifolia, Acacia cyclops, Acacia retinodes, Acacia pycnantha, Acacia mearnsii, and Acacia dealbata) by examining their chemical composition, antioxidant, and antimicrobial properties. Using high-resolution mass spectrometry, a comprehensive analysis successfully identified targeted compounds, including flavonoids (flavonols/flavones) and phenolic acids, such as 4-hydroxybenzoic acid, p-coumaric acid, and ellagic acid. Additionally, p-coumaric acid was specifically identified and quantified within the hydroxycinnamic aldehydes. This comprehensive characterization provides valuable insights into the chemical profiles of the studied species. Among the studied species, A. pycnantha exhibited a higher concentration of total phenolic compounds, including catechin, myricetin, quercetin, and coniferaldehyde. Furthermore, A. pycnantha displayed notable antibacterial activity against K. pneumoniae, E. coli, S. Typhimurium, and B. cereus. The identified compounds in Acacia pods and their shown antibacterial activities exhibit promising potential for future applications. Moreover, vibrational spectroscopy was a reliable method for distinguishing between species. These significant findings enhance our understanding of Acacia species and their potential for various industrial applications.
- Hydrolysable tannins in aged wine spirits: a fresh perspective using alternative ageing technology and high-resolution mass spectrometryPublication . Fernandes, Tiago A.; Antunes, Alexandra M.M.; Alves, Sheila Oliveira; Caldeira, Ilda; Anjos, O.; Catarino, Sofia; Canas, SaraWine spirits (WSs) are usually aged in wooden barrels, but using wood pieces instead of barrels, with or without micro-oxygenation, is a technological alternative that has been investigated by our team.
- Identification of gallotannins and ellagitannins in aged wine spirits : a new perspective using alternative ageing technology and high-resolution mass spectrometryPublication . Fernandes, Tiago A.; Antunes, Alexandra M.M.; Caldeira, Ilda; Anjos, O.; Freitas, Victor; Fargeton, Laurent; Boissier, Benjamin; Catarino, Sofia; Canas, SaraThis research was focused on identifying gallotannins and ellagitannins degradation pathways to better understand their behavior in complex media such as wine spirits (WS). A WS was aged with chestnut wood staves with three levels of micro-oxygenation, nitrogen, and using wooden barrels. Gallotannins and ellagitannins were identified by LC-ESI-HRMS/MS using a Q-TOF in samples collected at 8, 21, 60, 180, 270, and 365 days of ageing, allowed comparing their relative abundances according to the ageing technology. It was established for the first time, the importance of oxygen in gallotannins and ellagitannins formation/degradation pathways in WS and shading light into the explanation for the steady increase of gallic and ellagic acid contents on WS during ageing. The results also highlighted the presence of penta-O-galloyl-β-D-glucose, tetra-O-galloyl-β-D-glucose, tri- O-galloyl-β-D-glucose, di-O-galloyl-β-D-glucose, and mono-O-galloyl-β-D-glucose, 2,3-(S)-hexahydroxydiphenoyl-β-D-glucose, pedunculagin, isomers vescalagin/castalagin and two products stemming from ethanol-promoted oxidation of castalagin/vescalagin and vescalin/castalin, in the composition WS aged with chestnut wood.