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Simultaneous characterization and quantification of phenolic compounds in Thymu...
Pereira, Olívia R.; Peres, António M.; Silva, Artur M.S.; Domingues, M.R.M.; Cardoso, Susana M.Thymus x citriodorus is a Lamiaceae plant extensively cultivated in Mediterranean region and used for centuries in culinary and in traditional medicine. The present work describes the detailed phenolic composition of T. x citriodorus for the first time, the by means of HPLC-DAD, ESI-MS and MSn and nuclear magnetic resonance (NMR) analyses. The ethanolic extract of T. x citriodorus was analyzed by reversed phase...
Carbon footprint of apple and pear: orchards, storage and distribution
Figueiredo, Filipa; Castanheira, Érica Geraldes; Feliciano, Manuel; Rodrigues, M.A.; Peres, António M.; Maia, Filipe; Ramos, António; Carneiro, JoãoApple and pear represent 51% of fresh fruit orchards in Portugal. This paper presents a life-cycle (LC) greenhouse gas (GHG) assessment (so-called carbon footprint) of 3 apple and 1 pear Portuguese production systems. An LC model and inventory were implemented, encompassing the farm stage (cultivation of fruit trees in orchards), storage and distribution (transport to retail). The functional unit considered in ...
Carbon footprint of apple and pear: orchards, storage and distribution
Figueiredo, Filipa; Castanheira, Érica Geraldes; Feliciano, Manuel; Rodrigues, M.A.; Peres, António M.; Maia, Filipe; Ramos, António; Carneiro, JoãoApple and pear represent 51% of fresh fruit orchards in Portugal. This paper presents a life-cycle (LC) greenhouse gas (GHG) assessment (so-called carbon footprint) of 3 apple and 1 pear Portuguese production systems. An LC model and inventory were implemented, encompassing the farm stage (cultivation of fruit trees in orchards), storage and distribution (transport to retail). The functional unit considered in ...
Cyclic voltammetry: a tool to quantify 2,4,6-trichloroanisole in aqueous sample...
Peres, António M.; Freitas, Patrícia; Dias, Luís G.; Sousa, Mara E. B. C.; Castro, Luís M.; Veloso, Ana C. A.Chloroanisoles, namely 2,4,6-trichloroanisole, are pointed out as the primary responsible of the development of musty off-flavours in bottled wine, due to their migration from cork stoppers, which results in huge economical losses for wine industry. A prevention step is the detection of these compounds in cork planks before stoppers are produced. Mass spectrometry gas chromatography is the reference method used...
Determination of 2,4,6-trichloroanisole by cyclic voltammetry
Freitas, Patrícia; Dias, L.G.; Peres, António M.; Castro, Luís M.; Veloso, Ana C.A.The electrochemical reduction of 2,4,6-trichloroanisole (TCA), a chlorinated arene with electron-donating substituents, was evaluated by cyclic voltammetry (CV). TCA is a major concern for the winery industry since it is related with “cork taint”, a wine defect. The results obtained showed that CV could be used to detect and quantify TCA in standard solutions. Linear relationships could be set between the curre...
Supervised chemical pattern recognition in almond (Prunus dulcis) Portuguese PD...
Barreira, João C.M.; Casal, Susana; Ferreira, Isabel C.F.R.; Peres, António M.; Pereira, J.A.; Oliveira, M.B.P.P.Almonds harvested in three years in Trás-os-Montes (Portugal) were characterized to find differences among Protected Designation of Origin (PDO) Amêndoa Douro and commercial non-PDO cultivars. Nutritional parameters, fiber (neutral and acid detergent fibers, acid detergent lignin and cellulose), fatty acids, triacylglycerols (TAG) and tocopherols were evaluated. Fat was the major component, followed by carbohyd...
Chemical characterization of chestnut cultivars from three consecutive years: c...
Barreira, João C.M.; Casal, Susana; Ferreira, Isabel C.F.R.; Peres, António M.; Pereira, J.A.; Oliveira, M.B.P.P.Four Castanea sativa Miller cultivars (Aveleira, Boaventura, Judia and Longal) belonging to the Protected Designation of Origin ‘‘Castanha da Terra Fria’’, from the Northeast of Portugal, were selected in 2006, 2007 and 2008. Their nutritional, fatty acids, triacylglycerols and tocopherols profiles were evaluated. Water was the major component, followed by carbohydrates, protein and fat, with energetic values l...
Analysis of honey main sugars by size-exclusion chromatography
Sousa, Mara E.B.C.; Peres, António M.; Dias, L.G.; Morais, Jorge Sá; Estevinho, Leticia M.; Machado, AdélioThe main constituents of honey are sugars, mainly the monosaccharides fructose and glucose (reducing sugars), which account for 80% of the total mass, while the disaccharides (especially sucrose and maltose) represent 10%. In general, fructose predominates (giving a sweeter taste to honey than sucrose), although, in some honeys, glucose (that assigns a less sweet taste than sucrose but more than maltose) may be...
Sugar analysis by a multi-sensor system: applying to honey samples
Dias, L.G.; Sousa, Mara E.B.C.; Peres, António M.; Morais, Jorge Sá; Estevinho, Leticia M.; Machado, A.A.S.C.One of the emerging approaches for analysis of liquid samples with complex matrices is the Electronic Tongue (ET) since it allows evaluating tastes by calibration, mimicking the human tongue. The ET records a pattern of signals that depends on the matrix solution composition, which information is extracted into qualitative and quantitative information by multivariate statistical methods. The chemical sensors us...
Evaluation of an electronic tongue for honey classification according to its po...
Sousa, Mara E.B.C.; Dias, L.G.; Peres, António M.; Estevinho, Leticia M.; Machado, A.A.S.C.Electronic tongues (ET) have attracted great interest due to its potential to obtain global Information from complex samples that could hardly be obtained by traditional instrumental methods of analysis. These multi-sensor arrays provide a huge amount of sample information which, by applying chemometric methods, allows sample identification/ classification, taste evaluation as well as, multicomponent analysis. ...
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