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New biomimetic sensors for the determination of tetracycline in biological samp...
Moreira, Felismina T. C.; Guerreiro, J. Rafaela L.; Azevedo, Vera Lúcia; Kamel, Ayman H.; Sales, M. Goreti F.New potentiometric membrane sensors with cylindrical configuration for tetracycline (TC) are described based on the use of a newly designed molecularly imprinted polymer (MIP) material consisting of 2-vinylpyridine as a functional monomer in a plasticized PVC membrane. The sensor exhibited significantly enhanced response towards TC over the concentration range 1.59 10 5–1.0 10 3 mol L 1 at pH 3–5 with a low...
Gold electrode modified by self-assembled monolayers of thiols to determine DNA...
Silva, Mízia M. S.; Cavalcanti, Igor T.; Barroso, M. Fátima; Sales, M. Goreti F.; Dutra, Rosa FiremanThe process of immobilization of biological molecules is one of the most important steps in the construction of a biosensor. In the case of DNA, the way it exposes its bases can result in electrochemical signals to acceptable levels. The use of self-assembled monolayer that allows a connection to the gold thiol group and DNA binding to an aldehydic ligand resulted in the possibility of determining DNA hybridiza...
Survey of trace elements (Al, As, Cd, Cr, Co, Hg, Mn, Ni, Pb, Se, and Si) in re...
Barroso, M. Fátima; Ramos, Sandra; Oliva-Teles, Maria Teresa; Delerue-Matos, Cristina; Sales, M. Goreti F.; Oliveira, M. Beatriz P. P.Concentrations of eleven trace elements (Al, As, Cd, Cr, Co, Hg, Mn, Ni, Pb, Se, and Si) were measured in 39 (natural and flavoured) water samples. Determinations were performed using graphite furnace electrothermetry for almost all elements (Al, As, Cd, Cr, Co, Mn, Ni, Pb, and Si). For Se determination hydride generation was used, and cold vapour generation for Hg. These techniques were coupled to atomic absor...
Sulfadiazine-potentiometric sensors for flow and batch determinations of sulfad...
Kamel, Ayman H.; Almeida, Sofia A. A.; Sales, M. Goreti F.; Moreira, Felismina T. C.New PVC membrane electrodes for the determination of sulfadiazine (SDZ) are presented. The electrodes are fabricated with conventional and tubular configurations with a graphite-based electrical contact, and no internal reference solution. The selective membranes consist of bis(triphenylphosphoranilidene)ammonium·SDZ (electrode A), tetraoctylammonium bromide (electrode B), or iron(II)-phthalocyanine (FePC) (ele...
Flow amperometric determination of carbofuran and fenobucarb
Sales, M. Goreti F.; Vaz, M. Carmo V. F.; Delerue-Matos, Cristina; Almeida, Sofia A. A.; Barroso, M. Fátima; Ferreira, Helder A. O.A simple, rapid, and precise amperometric method for quantification of N-methylcarbamate pesticides in water samples and phytopharmaceuticals is presented. Carbofuran and fenobucarb are the target analytes. The method is developed in flow conditions providing the anodic oxidation of phenolic-based compounds formed after alkaline hydrolysis. Optimization of instrumental and chemical variables is presented. Under...
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