Author Archives: fqm302

Ultrasound-assisted surfactant-enhanced emulsification microextraction for the determination of carbamates in wines by ultra-high performance liquid chromatography–tandem mass spectrometry

Posted on 14 October, 2013 by fqm302

A new sensitive multiresidue method based on ultra-high performance liquid chromatography–tandem mass spectrometry (UHPLC–MS/MS) has been developed for the detection, confirmation and quantification of twenty five carbamates in wine samples. The separation was achieved in 5.5 min, using a Zorbax Eclipse … Continue reading →

Posted in Carbamates, Mass spectrometry, UASEME, UHPLC, Wine | Tagged , | Comments Off on Ultrasound-assisted surfactant-enhanced emulsification microextraction for the determination of carbamates in wines by ultra-high performance liquid chromatography–tandem mass spectrometry

Green methodology based on dispersive liquid–liquid microextraction and micellar electrokinetic chromatography for 5-nitroimidazole analysis in water samples

Posted on 19 September, 2013 by fqm302

Dispersive liquid–liquid microextraction has been proposed as an extraction technique combined with micellar  electrokinetic chromatography (MEKC) for the analysis of eight 5-nitroimidazole compounds, including some metabolites, in water samples. Determination has been carried out using a diode array detector, employing … Continue reading →

Posted in 5-nitroimidazoles, DLLME, MEKC, Sweeping, UV-vis, Water | Tagged , | Comments Off on Green methodology based on dispersive liquid–liquid microextraction and micellar electrokinetic chromatography for 5-nitroimidazole analysis in water samples

Micellar electrokinetic chromatography–electrospray ionization mass spectrometry employing a volatile surfactant for the analysis of amino acids in human urine

Posted on 12 September, 2013 by fqm302

A new MEKC-ESI-MS method for the analysis of amino acids (AAs) in human urine was developed employing ammonium perfluorooctanoate (APFO) as volatile surfactant. The influence of APFO on the MS signal of AAs was evaluated by infusion experiments, which showed … Continue reading →

Posted in Amino acids, MEKC, Mass spectrometry, Urine | Tagged , | Comments Off on Micellar electrokinetic chromatography–electrospray ionization mass spectrometry employing a volatile surfactant for the analysis of amino acids in human urine

Mass spectrometric and contactless conductivity detection approaches in the determination of muscle relaxants by capillary electrophoresis

Posted on 12 September, 2013 by fqm302

Novel and rapid capillary electrophoresis-coupled tandem mass spectrometry (CE-MS/MS) and capillary electrophoresis with capacitively coupled contactless conductivity detection (CE-C4D) methods have been developed for the separation and determination of three neuromuscular blocking agents: pancuronium, vecuronium, and rocuronium. In both cases, … Continue reading →

Posted in C4D, CZE, Cyclodextrins, Mass spectrometry, Muscle relaxants, Pharmaceutical formulations | Tagged , | Comments Off on Mass spectrometric and contactless conductivity detection approaches in the determination of muscle relaxants by capillary electrophoresis

Novel solid phase extraction method for the analysis of 5-nitroimidazoles and metabolites in milk samples by capillary electrophoresis

Posted on 9 September, 2013 by fqm302

A new sample treatment has been developed for the extraction of 5-nitroimidazole (5-NDZ) drugs in milk samples previous to their determination by micellar electrokinetic chromatography (MEKC). Fat removing and protein precipitation were simultaneously carried out by the addition of trichloroacetic … Continue reading →

Posted in 5-nitroimidazoles, MEKC, Milk, SPE, Sweeping, UV-vis | Tagged , | Comments Off on Novel solid phase extraction method for the analysis of 5-nitroimidazoles and metabolites in milk samples by capillary electrophoresis

On-line anion exchange solid-phase extraction coupled to liquid chromatography with fluorescence detection to determine quinolones in water and human urine

Posted on 5 September, 2013 by fqm302

An analytical method based on on-line solid-phase extraction coupled to liquid chromatography with fluorescence detection has been developed to determine quinolones in tap water and human urine. A home-made setup was used to percolate 10 mL of sample through a solid-phase … Continue reading →

Posted in Fluorescence, Quinolones, Urine, Water, on-line SPE | Tagged , | Comments Off on On-line anion exchange solid-phase extraction coupled to liquid chromatography with fluorescence detection to determine quinolones in water and human urine

Simple methodology for the determination of mycotoxins in pseudocereals, spelt and rice

Posted on 4 September, 2013 by fqm302

Nowadays the interest and consumption of pseudocereals is increasing due to their nutritional properties. Like cereals and oilseeds, pseudocereal seeds are susceptible to fungal growth and mycotoxin contamination; however these matrices have received little attention in literature. A sensitive, simple … Continue reading →

Posted in Mass spectrometry, Pseudocereals, QuEChERS, Rice, Spelt, UHPLC | Tagged | Comments Off on Simple methodology for the determination of mycotoxins in pseudocereals, spelt and rice

Alternative sample treatments for the determination of sulfonamides in milk by HPLC with fluorescence detection

Posted on 3 September, 2013 by fqm302

This paper presents two sample treatments, dispersive liquid–liquid microextraction (DLLME) and QuEChERS for the determination of 9 sulfonamides, regulated by the EU Council in milk samples. Both methods represent useful alternatives to conventional procedures based mainly in solid-phase extraction, in … Continue reading →

Posted in DLLME, Fluorescence, Milk, QuEChERS, Sulfonamides | Tagged | Comments Off on Alternative sample treatments for the determination of sulfonamides in milk by HPLC with fluorescence detection

Ion-paired extraction of cephalosporins in acetone prior to their analysis by capillary liquid chromatography in environmental water and meat samples

Posted on 2 August, 2013 by fqm302

Ion-pair extraction of cephalosporins from aqueous solution into acetone by the addition of ammonium sulfate to a 1:2 (v/v) acetone–water solvent was carried out followed by their determination using reversed-phase capillary liquid chromatography. The analytes included are cephoperazone, cefquinome, cephalexin, … Continue reading →

Posted in Capillary HPLC, Cephalosporins, Meat, SALLE, UV-vis, Water | Tagged , | Comments Off on Ion-paired extraction of cephalosporins in acetone prior to their analysis by capillary liquid chromatography in environmental water and meat samples

Micotoxinas: aproximaciones analíticas y metabolómicas

Posted on 26 July, 2013 by fqm302

Las micotoxinas son metabolitos secundarios tóxicos, de composición variada, producidos por diferentes hongos. Suelen contaminar alimentos, piensos, o las materias primas utilizadas para su elaboración, pudiendo afectar a la salud tanto de humanos como de animales. Debido a su gran … Continue reading →

Posted in Theses | Comments Off on Micotoxinas: aproximaciones analíticas y metabolómicas