Time filter

Source Type

Fortuny G.,Laboratori Agencia Of Salut Publica Of Barcelona | Fortuny G.,CIBER ISCIII | Pineda L.,Laboratori Agencia Of Salut Publica Of Barcelona | Pineda L.,CIBER ISCIII | And 5 more authors.
International Journal of Environmental Analytical Chemistry | Year: 2013

A method for determination of 61 organic pollutants (polycyclic aromatic hydrocarbons and organochlorine, organophosphorous and organonitrogen pesticides) is proposed. It is based on solid phase extraction (SPE) and subsequent analysis of the extract by liquid and gas chromatography coupled to tandem mass spectrometry. Method validation yielded to the following values: limits of quantification, from 0.005 to 0.020 μg L-1; trueness, 95% to 113% and reproducibility (as percent relative standard deviation), 2% to 15%. Additionally, the method performed well in various proficiency tests. © 2013 Copyright Taylor and Francis Group, LLC. Source

Jimenez V.,University of Barcelona | Rubies A.,Laboratori Agencia Of Salut Publica Of Barcelona | Centrich F.,Laboratori Agencia Of Salut Publica Of Barcelona | Companyo R.,University of Barcelona | Guiteras J.,University of Barcelona
Journal of Chromatography A | Year: 2011

A multiclass method for the analysis of residues, in egg matrices, of 41 antimicrobial agents belonging to seven families (sulfonamides, diaminopyridine derivates, quinolones, tetracyclines, macrolides, penicillins and lincosamides) was developed and validated according to the requirements of European Commission Decision 2002/657. Compounds were extracted with a pressurized liquid extraction (PLE) technique using a 1:1 mixture of acetonitrile and a succinic acid buffer (pH 6.0) at 70°C. As this resulted in clear extracts, no further clean-up was necessary. Analytes were determined by ultra-high-pressure liquid chromatography-tandem mass spectrometry (UHPL-MS/MS) in a chromatographic run of 13min. Calibration was carried out with spiked blank samples subjected to the entire analytical procedure. Five compounds, two of them isotopically labelled, were used as internal standards. Most analytes were quantified with errors below 10%. Precision in terms of reproducibility standard deviation was between 10% and 20% in most cases. CCα values were in the range 0.5-3.8μgkg-1 for the non-authorized compounds. The proposed method would enable an experienced analyst to process about 25 samples per day. © 2011 Elsevier B.V. Source

Chico J.,University of Barcelona | Rubies A.,Laboratori Agencia Of Salut Publica Of Barcelona | Centrich F.,Laboratori Agencia Of Salut Publica Of Barcelona | Companyo R.,University of Barcelona | And 2 more authors.
Analytical and Bioanalytical Chemistry | Year: 2013

An analytical method for determination and confirmation of nine coccidiostatics in eggs is reported. Ethyl acetate is used as extraction solvent, with satisfactory results, and simple automated clean-up is based on gelpermeation chromatography (GPC)*The target compounds are then analysed by liquid chromatography-electrospray ionization-tandem mass spectrometry. The method was validated in-house in accordance with Commission Decision 2002/657/EC. Trueness and precision were determined at four concentrations, and the mean errors obtained were <10 %, with relative standard deviations ranging from 3 to 18 %. For three non-authorized coccidiostatics (clopidol, ethopabate, and ronizadole), decision limit and detection capability were in the ranges 0.12-0.16 and 0.18-0. 23 μg kg- 1, respectively. The results obtained prove the suitability of this new analytical method for routine monitoring of these substances in eggs. © Springer-Verlag Berlin Heidelberg 2013. Source

Discover hidden collaborations