Encontrados 13 documentos, a visualizar página 1 de 2
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...
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...
An overview of analytical methodologies for the determination of antibiotics in...
Seifrtová, Marcela; Nováková, Lucie; Lino, Celeste; Pena, Angelina; Solich, PetrThe widespread occurrence of antibiotics as contaminants in the aquatic environment has increased attention in the last years. The concern over the release of antibiotics into the environment is related primarily to the potential for the development of antimicrobial resistance among microorganisms. This article presents an overview of analytical methodologies for the determination of quinolone (Qs) and fluoroqu...
Analysis of fumonisins in corn-based food by liquid chromatography with fluores...
Silva, Liliana; Fernández-Franzón, Mónica; Font, Guillermina; Pena, Angelina; Silveira, Irene; Linop, Celeste; Mañes, Jordihttp://www.sciencedirect.com/science/article/B6T6R-4SYCR00-1/1/4790f7bb09d09cc828f129a1201e288a
Determination of fluoroquinolone antibiotics in surface waters from Mondego Riv...
Pena, Angelina; Chmielova, Daniela; Lino, Celeste M.; Solich, PetrA novel LC-fluorescence detection method based on the use of a monolithic column for the determination of norfloxacin, ciprofloxacin, and enrofloxacin antibiotic residues in environmental waters was developed. Fluoroquinolones (FQs) were isocratically eluted using a mobile phase consisting of 0.025 M phosphoric acid solution at pH 3.0 with tetrabutylammonium and methanol (960:40, v/v) through a Chromolith Perfo...
Determination of Tetracycline Antibiotic Residues in Edible Swine Tissues by Li...
Pena, Angelina; Lino, Celeste M.; Alonso, Rosa; Barceló, DamiaA sensitive and specific method is described for the simultaneous determination of oxytetracycline, tetracycline (TC), and chlortetracycline residues in edible swine tissues, by combining liquid chromatography with spectrofluorometric and mass spectrometry detection. The procedure involved a preliminary extraction with EDTA-McIlvaine buffer acidified at pH 4.0, followed by solid-phase extraction cleanup using a...
Determination of ochratoxin A in coriander (Coriandrum sativum L.) by HPCL/fluo...
Lino,Celeste Matos; Baeta,Lurdes; Pena,Angelina Simões; Silveira,Irene NoronhaAn analytical study based on extraction with acetonitrile-water, immunoaffinity column cleanup, and HPLC/fluorescence detection for separation and identification of ochratoxin A in coriander was carried out. Validation of the applied methodology was done through accuracy and precision studies. Homogenized samples of coriander were spiked in triplicate with ochratoxin A at 0.5, 1.0, 2.0, and 5.0 µg/kg levels. Re...
Metodologias analíticas para determinação das fumonisinas em milho e alimentos ...
Lino,Celeste M.; Silva,Liliana J. G.; Pena,Angelina S.Fumonisins are mycotoxins occurring worldwide, mainly in maize and maize-based food products, which could affect animal and human health. This paper reviews analytical methodologies for the determination of these fungal toxins in foods. It includes extraction, cleanup, derivatization procedures, detection, quantification, and confirmation procedures. Initial attempts at gas chromatographic methods and thin laye...
Determination of ticlopidine in human plasma by capillary gas chromatography wi...
Pena, Angelina; Lino, Celeste; Silveira, M. Irene N.A gas chromatographic method for determination of ticlopidine in human plasma using mass spectrometric detection was developed. A Perkin Elmer model 8500 gas chromatograph coupled to an ion trap detector (ITD) in electron impact mode (EI) was used. The gas chromatograph was fitted with a 30 m×0.32 mm i.d., DB-17 capillary column with a film thickness of 0.25 [mu]m. The compounds were isolated from plasma by Ext...
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