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Mostrando ítems 1-20 de 31
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A liquid chromatography method using a monolithic column for the determination of corticoids in animal feed and animal feeding water
Muñíz Valencia, Roberto; Ceballos Magaña, Silvia G.; Gonzalo Lumbreras, Raquel; Santos Montes, Ana María; Izquierdo Hornillos, Roberto (01/01/2008)An HPLC-DAD method for determining corticoids in calf feed and in animal feeding water samples using a monolithic column has been developed and validated. The method optimization included the study of binary mobile phases ... -
Comparison of the performance of conventional microparticulates and monolithic reversed-phase columns for liquid chromatography separation of eleven pollutant phenols
Cledera Castro, Mª del Mar; Santos Montes, Ana María; Izquierdo Hornillos, Roberto (01/09/2005)The performance of isocratic separations of 11 pollutant phenols (PP) using monolithic (Chromolith RP-18e) and conventional reversedphase 5m (Luna and Purospher C18) and 4m (Synergi C12) particulate size columns, selected ... -
Comparison of the performance of different reversed-phase columns for liquid chromatography separation of 11 pollutant phenols
Cledera Castro, Mª del Mar; Santos Montes, Ana María; Izquierdo Hornillos, Roberto; Gonzalo Lumbreras, Raquel (01/03/2007)A systematic optimization of the HPLC separation of a mixture containing 11 pollu- tant phenols (PPs) using a Hypersil ODS (250mm64.6 mm, 5 lm) column and UV- DAD detection has been carried out. The binary mobile phases ... -
Extraction and high-performance liquid chromatographic separation of deflazacort and its metabolite 21-hydroxydeflazacort. Application to urine samples
Santos Montes, Ana María; Gonzalo Lumbreras, Raquel; Gasco López, A.I.; Izquierdo Hornillos, Roberto (01/07/1994)Two HPLC methods for the separation of a mixture of corticoids including the oxazolinic corticoid deflazacort and its metabolite 21-hydroxydeflazacort using different water-tetrahydrofuran mobile phases were developed. ... -
GC-MS method development and validation for anabolic steroids in feed samples
Muñíz Valencia, Roberto; Ceballos Magaña, Silvia G.; Gonzalo Lumbreras, Raquel; Santos Montes, Ana María; Izquierdo Hornillos, Roberto (01/03/2008)A GC-MS method for the determination of AAS used as growth promoting agents using SIM in piglet feed samples has been developed and validated, using testosterone as internal standard. The formation of volatile steroid ... -
High-performance liquid chromatographic separation of a complex mixture of diuretics using a micellar mobile phase of sodium dodecyl sulphate. Application to human urine samples
Rosado María, A.; Gasco López, A.I.; Santos Montes, Ana María; Izquierdo Hornillos, Roberto (01/10/2000)A systematic optimization of the HPLC separation of a complex mixture containing 19 diuretics by micellar liquid chromatography using sodium dodecyl sulphate (SDS), a Hypersil (150 mmx3.0 mm I.D., 5 microm) C18 column, a ... -
High-performance liquid chromatographic separation of corticoid alcohols and their derivatives: a hydrolysis study including application to pharmaceuticals
Gonzalo Lumbreras, Raquel; Santos Montes, Ana María; García Moreno, E.; Izquierdo Hornillos, Roberto (01/01/1997)Several reversed-phase high-performance liquid chromatographic methods for the baseline separation of some glucocorticoid alcohols and their derivatives (esters and acetals) have been developed. These methods involve ... -
Life Cycle Assessment and Soil Nitrogen Balance of Different N Fertilizers for Top Dressing Rye as Energy Crop for Electricity Generation
Martín Sastre, Carlos; Barro Piñeiro, Ruth; González Arechavala, Yolanda; Santos Montes, Ana María; Ciria Ciria, María Pilar (25/04/2021)Nitrogen fertilizers have been identified in energy crops LCAs as the main contributors to global warming, as well as to many other environmental impacts. The distinct production process and application emissions of nitrogen ... -
Liquid chromatographic method development for anabolic androgenic steroids using a monolithic column Application to animal feed samples
Muñíz Valencia, Roberto; Gonzalo Lumbreras, Raquel; Santos Montes, Ana María; Izquierdo Hornillos, Roberto (01/03/2008)An isocratic HPLC method for the determination with screening purposes of anabolic androgenic steroids (AASs: fluoxymesterone, boldenone, nortestosterone, metandrostenolone, norethindrone, methyltestosterone and bolasterone), ... -
Liquid chromatographic method development for steroids determination (corticoids and anabolics). Application to animal feed samples
Gonzalo Lumbreras, Raquel; Muñíz Valencia, Roberto; Santos Montes, Ana María; Izquierdo Hornillos, Roberto (01/07/2007)A LC isocratic separation study of a complex mixture containing 18 steroids (corticoids and anabolics), used potentially as growth promoters, was carried out. For this purpose, using a Hypersil ODS column at controlled ... -
Method development and validation for melamine and its derivatives in rice concentrates by liquid chromatography. Application to animal feed samples
Muñíz Valencia, Roberto; Ceballos Magaña, Silvia G.; Rosales Martínez, Daniel; Gonzalo Lumbreras, Raquel; Santos Montes, Ana María; Cubedo Fernández-Trapiella, Angel; Izquierdo Hornillos, Roberto (01/10/2008)An isocratic LC method for the determination of melamine and its degradation products (ammelide, ammeline, and cyanuric acid), used to increase the apparent protein content of rice protein concentrate, has been developed. ... -
Method Development and Validation for Phenol and Nitrophenols in Tap Water by HPLC using a Monolithic Column
Cledera Castro, Mª del Mar; Santos Montes, Ana María; Izquierdo Hornillos, Roberto (01/01/2006)An isocratic HPLC method for the determination of phenol and nitrophenols (4-nitrophenol, 2-nitrophenol, 4,6-dinitro-o-cresol and 2,4-dinitrophenol) has been developed and validated using 2-chlorophenol as internal standard ... -
Method development for betamethasone and dexamethasone by micellar liquid chromatography using cetyl trimethyl ammonium bromide and validation in tablets. Application to cocktails
Peña García-Brioles, D.; Gonzalo Lumbreras, Raquel; Izquierdo Hornillos, Roberto; Santos Montes, Ana María (01/09/2004)An isocratic liquid chromatographic method for the determination of betamethasone (BM) and dexamethasone (DM) using methylprednisolone (MPL) as internal standard and micellar mobile phases consisting of cetyl trimethyl ... -
Method Development for Cortisol and Cortisone by Micellar Liquid Chromatography Using Sodium Dodecyl Sulphate: Application to Urine Samples of Rugby Players
Izquierdo Hornillos, Roberto; Gonzalo Lumbreras, Raquel; Santos Montes, Ana María (01/01/2005)The chromatographic behavior of cortisol and cortisone using a micellar medium of sodium dodecyl sulphate (SDS) as surfactant, a Hypersil C18 (150- ? 3.2-mm i.d., 5 ?m) column, a flow rate of 0.5 mL/min, and UV absorbance ... -
Method development validation for corticoids in animal feed samples by liquid chromatography using a monolithic column
Muñíz Valencia, Roberto; Gonzalo Lumbreras, Raquel; Santos Montes, Ana María; Izquierdo Hornillos, Roberto (01/11/2007)A LC method for corticosteroids (CC) determination in poultry feed using a Chromolith column and UV detection has been developed and validated. The method development involved the optimization of different hydro-organic ... -
Optimization of separation of a complex mixture of natural and synthetic corticoids by micellar liquid chromatography using sodium dodecyl sulphate. Application to urine samples
Santos Montes, Ana María; Izquierdo Hornillos, Roberto (01/03/1999)A systematic optimization of the separation of a mixture of corticoids by micellar liquid chromatography, using sodium dodecyl sulphate as surfactant, a Hypersil (250 mm x 3.2 mm I.D.) C18 column, a flow-rate of 0.5 ml ... -
Optimization of the high-performance liquid chromatographic separation of a mixture of natural and synthetic corticosteroids
Santos Montes, Ana María; Gasco López, A.I.; Izquierdo Hornillos, Roberto (01/10/1993)Systematic optimization of the HPLC separation of a mixture of natural and synthetic corticosteroids was carried out for screening purposes. The method involves binary, ternary or quaternary mixtures containing water, ... -
Quantitative screening for steroids in animal feeding water using reversed phase LC with gradient elution
Muñíz Valencia, Roberto; Gonzalo Lumbreras, Raquel; Santos Montes, Ana María; Izquierdo Hornillos, Roberto (01/02/2008)Several isocratic separations for the determination of 20 steroids (STER) in animal feeding water samples (AFWS) from drinking-trough by LC using a mobile phase ACN/H(2)O (35:65 v/v) and different RP columns (Hypersil C18, ... -
Química
Cano de Santayana Ortega, Mercedes; Coloma Castaño, Raquel; Hueso Kortekaas, Catalina; Paz Jiménez, Eva; Pizarro Arranz, Ana María; Revuelta Aramburu, Marta; Santos Montes, Ana María (26/08/2015) -
Química
Benedicto Córdoba, Marcos; Cano de Santayana Ortega, Mercedes; Coloma Castaño, Raquel; Delgado Mellado, Noemí; Herrero Palomino, Marta; Hueso Kortekaas, Catalina; Ramírez Santa-Pau, Federico; Revuelta Aramburu, Marta; Santos Montes, Ana María (15/07/2021)