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Analytical Approaches toward Successful Human Cell Metabolome Studies by NMR Sp...
Duarte, Iola F.; Marques, Joana; Ladeirinha, Ana F.; Rocha, Cláudia; Lamego, Inês; Calheiros, Rita; Silva, Tânia M.; Marques, M. Paula M.The aim of this work was to investigate the effects of cell handling and storage on cell integrity and 1H high resolution magic angle spinning (HRMAS) NMR spectra. Three different cell types have been considered (lung tumoral, amniocytes, and MG-63 osteosarcoma cells) in order for sample-dependent effects to be identified. Cell integrity of fresh cells and cells frozen in cryopreservative solution was 70−80%, w...
Fluoxetine and Norfluoxetine Revisited: New Insights into the Electrochemical a...
Garrido, E. Manuela; Garrido, Jorge; Calheiros, Rita; Borges, FernandaThe extent to which humans and wildlife are exposed to the vast array of anthropogenic chemicals and their degradation products, along with related naturally occurring compounds, is nowadays an important issue. The study of the physical-chemical properties of the compounds and/or degradation products is an important subject because some of them are intrinsically related to its resistance to degradation and/or b...
Electrochemical and spectroscopic characterisation of amphetamine-like drugs: A...
Milhazes, Nuno; Martins, Pedro; Uriarte, Eugenio; Garrido, Jorge; Calheiros, Rita; Marques, M. Paula M.; Borges, FernandaA complete physicochemical characterisation of MDMA and its synthetic precursors MDA, 3,4-methylenedioxybenzaldehyde (piperonal) and 3,4-methylenedioxy-[beta]-methyl-[beta]-nitrostyrene was carried out through voltammetric assays and Raman spectroscopy combined with theoretical (DFT) calculations. The former provided important analytical redox data, concluding that the oxidative mechanism of the N-demethylation...
Structural characterization of agmatine at physiological conditions
Toninello, Antonio; Battaglia, Valentina; Salvi, Mauro; Calheiros, Rita; Marques, M.Abstract The present work aims at determining the structure–activity relationships (SAR’s) which rule the biological function of agmatine (4-(aminobutyl)guanidinium, AGM), a biogenic amine produced by decarboxylation of arginine. Its structural preferences, both as an isolated molecule and in aqueous solution (namely at physiological conditions) were ascertained, by vibrational (Raman) spectroscopy coupled to ...
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