Research and Development Unit for Mechanical and Industrial Engineering

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Multi-element and multi-isotopic profiles of Port and Douro wines as tracers for authenticity

Publication . Coelho, Inês; Matos, Ana Sofia; Epova, Ekaterina N.; Barre, Julien; Cellier, Robin; Ogrinc, Nives; Castanheira, Isabel; Bordado, João; Donard, Olivier F.X.

Port and Douro wines are produced in the Douro Demarcated Region using different wine making processes. This works aims at evaluating the influence of the geographical origin and the wine making process in their multielement (Li, Be, B, Al, Cr, Mn, Co, Ni, Cu, Zn, As, Se, Rb, Sr, Mo, Ag, Cd, Sn, Tl, Pb, Fe, Mg, P, Ca, Na, K) and isotopic compositions (87Sr/86Sr, δ11B, xPb/yPb, δ18O). Fifteen samples of each were analysed. ANOVA identified significant differences for Ca, Na, Rb, Zn, Cu, Cr, Se, 206Pb/204Pb, 207Pb/204Pb, 206Pb/207Pb and δ11B. PCA revealed that Cr, Se and Cu are the main contributors for discrimination by type of wine. 87Sr/86Sr and δ18O are region specific and not influenced by the winemaking process or storage. Thus, make good natural tracers for geographical origin of this region. HCA suggested a common profile in Port and Douro in white wines, for Sr and K, which should be further investigated.

2022-10-15Journal article

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The occurrence of inorganic contaminants in ‘tronchuda’ cabbage (Brassica oleracea L. var. costata DC.) after large forest fires in Portugal

Publication . Ventura, Marta; Cavaco, H.; Delgado, Inês; Coelho, Inês; Gueifão, Sandra; Martins, M.; Costa, M.H.; Matos, A.; Castanheira, Isabel

European Mediterranean countries have been affected by unhealthy pollutants released by wildfire smoke. This work aims to determine the inorganic elements, present in the vegetable widely consumed by the rural population, provided by burned areas. Two groups composed the sampling plan; group one before forest fires and group two after forest fires under three campaigns: 1) immediately after forest fires; 2) after rainfall; 3) during springtime. ICP-MS analysed all the samples to evaluate the contents of As, Br, Cd, Co, Cr, Pb, Se, Sr, and Zn. The amounts of trace elements founded were the following Pb < Cd < Co < As < Cr < Se < Zn < Br < Sr. Hierarchical Cluster Analysis evidenced 4 clusters; the first with the highest contents of Cr and Pb, the second cluster was marked by the highest amounts of As, and Br, higher values of Se characterised the third cluster, and the fourth cluster presented the highest values of Zn and Cd. The contents of contaminants in group one is not a matter of concern. The results obtained in group two identified a hazard, decreasing one year after the fires and maintaining these patterns afterwards. Occurrence data from local foods is a pioneer to study the impact of forest fires on human health through food consumption.

2021-04-19Journal article

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