Encontrados 25 documentos, a visualizar página 1 de 3
Application of green zero-valent iron nanoparticles to the remediation of soils...
Machado, S.; Stawiński, W.; Slonina, P.; Pinto, A. R.; Grosso, J. P.; Nouws, Henri P. A.; Albergaria, José Tomás; Delerue-Matos, CristinaZero-valent iron nanoparticles (nZVIs) are often used in environmental remediation. Their high surface area that is associated with their high reactivity makes them an excellent agent capable of transforming/degrading contaminants in soils and waters. Due to the recent development of green methods for the production of nZVIs, the use of this material became even more attractive. However, the knowledge of its ca...
Pilot monitoring study of ibuprofen in surface waters of north of Portugal
Paíga, Paula; Santos, Lúcia; Amorim, Célia G.; Araújo, Alberto N.; Montenegro, M. Conceição B. S. M.; Pena, Angelina; Delerue-Matos, CristinaIbuprofen is amongst the most worldwide consumed pharmaceuticals. The present work presents the first data in the occurrence of ibuprofen in Portuguese surface waters, focusing in the north area of the country, which is one of the most densely populated areas of Portugal. Analysis of ibuprofen is based on pre-concentration of the analyte with solid phase extraction and subsequent determination with liquid chrom...
Determination of ochratoxin A in bread: evaluation of microwave-assisted extrac...
Paíga, Paula; Morais, Simone; Oliva-Teles, Maria Teresa; Correia, Manuela; Delerue-Matos, Cristina; Sousa, Ana M. M.; Gonçalves, Maria PilarAn analytical method using microwave-assisted extraction (MAE) and liquid chromatography (LC) with fluorescence detection (FD) for the determination of ochratoxin A (OTA) in bread samples is described. A 24 orthogonal composite design coupled with response surface methodology was used to study the influence of MAE parameters (extraction time, temperature, solvent volume, and stirring speed) in order to maximize...
PAH air pollution at a Portuguese urban area: carcinogenic risks and sources id...
Slezakova, Klara; Pires, J. C. M.; Castro, Dionísia; Alvim-Ferraz, Maria da Conceição M.; Delerue-Matos, Cristina; Morais, S.; Pereira, Maria do CarmoThis study aimed to characterize air pollution and the associated carcinogenic risks of polycyclic aromatic hydrocarbon (PAHs) at an urban site, to identify possible emission sources of PAHs using several statistical methodologies, and to analyze the influence of other air pollutants and meteorological variables on PAH concentrations.The air quality and meteorological data were collected in Oporto, the second l...
Biocomplementation of SVE to achieve clean-up goals in soils contaminated with ...
Soares, António Alves; Pinho, Maria Teresa; Albergaria, José Tomás; Domingues, Valentina F.; Alvim-Ferraz, Maria da Conceição M.Soil vapor extraction (SVE) and bioremediation (BR) are two of the most common soil remediation technologies. Their application is widespread; however, both present limitations, namely related to the efficiencies of SVE on organic soils and to the remediation times of some BR processes. This work aimed to study the combination of these two technologies in order to verify the achievement of the legal clean-up go...
Development of a simple analytical method for the simultaneous determination of...
Santos, Lúcia H. M. L. M.; Paíga, Paula; Araújo, Alberto N.; Pena, Angelina; Delerue-Matos, Cristina; Montenegro, M. Conceição B. S. M.Paracetamol is among the most worldwide consumed pharmaceuticals. Although its occurrence in the environment is well documented, data about the presence of its metabolites and transformation products is very scarce. The present work describes the development of an analytical method for the simultaneous determination of paracetamol, its principal metabolite (paracetamol-glucuronide) and its main transformation p...
Analysis of six fungicides and one acaricide in still and fortified wines using...
Martins, Joana; Esteves, Cristina; Limpo-Faria, Ana; Barros, Paulo; Ribeiro, Natália; Simões, Tomás; Correia, Manuela; Delerue-Matos, CristinaA multiresidue gas chromatographic method for the determination of six fungicides (captan, chlorthalonil, folpet, iprodione, procymidone and vinclozolin) and one acaricide (dicofol) in still and fortified wines was developed. Solid-phase microextraction (SPME) was chosen for the extraction of the compounds from the studied matrices and tandem mass spectrometry (MS/MS) detection was used. The extraction consists...
Analysis of polycyclic aromatic hydrocarbons in fish: optimisation and validati...
Ramalhosa, Maria João; Paíga, Paula; Morais, Simone; Sousa, Ana M. M.; Gonçalves, Maria Pilar; Delerue-Matos, Cristina; Oliveira, M. Beatriz P. P.An accurate and sensitive method for determination of 18 polycyclic aromatic hydrocarbons (PAHs) (16 PAHs considered by USEPA as priority pollutants, dibenzo[a,l]pyrene and benzo[j]fluoranthene) in fish samples was validated. Analysis was performed by microwave-assisted extraction and liquid chromatography with photodiode array and fluorescence detection. Response surface methodology was used to find the optima...
DNA-based biosensor for the electrocatalytic determination of antioxidant capac...
Barroso, M. Fátima; de-los-Santos-Álvarez, N.; Lobo-Castañón, M. J.; Miranda-Ordieres, A. J.; Delerue-Matos, Cristina; Oliveira, M. Beatriz P. P.Reactive oxygen species (ROS) are produced as a consequence of normal aerobic metabolism and are able to induce DNA oxidative damage. At the cellular level, the evaluation of the protective effect of antioxidants can be achieved by examining the integrity of the DNA nucleobases using electrochemical techniques. Herein, the use of an adenine-rich oligonucleotide (dA21) adsorbed on carbon paste electrodes for the...
Towards a reliable technology for antioxidant capacity and oxidative damage eva...
Barroso, M. Fátima; de-los-Santos-Álvarez, N.; Delerue-Matos, Cristina; Oliveira, M. Beatriz P. P.To counteract and prevent the deleterious effect of free radicals the living organisms have developed complex endogenous and exogenous antioxidant systems. Several analytical methodologies have been proposed in order to quantify antioxidants in food, beverages and biological fluids. This paper revises the electroanalytical approaches developed for the assessment of the total or individual antioxidant capacity. ...
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