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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 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 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 ... -
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 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 ... -
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, ... -
Sample preparation for the determination of steroids (corticoids and anabolics) in feed using LC
Muñíz Valencia, Roberto; Ceballos Magaña, Silvia G.; Gonzalo Lumbreras, Raquel; Santos Montes, Ana María; Izquierdo Hornillos, Roberto (01/07/2008)An improved sample preparation procedure for the determination of 17 steroids (corticoids (CC) and androgenic anabolic steroids (AAS)), used potentially as growth promoters, in feed samples has been developed. This procedure ... -
Simultaneous determination of cortisol and cortisone in urine by reversed-phase high-performance liquid chromatography. Clinical and doping control applications
Santos Montes, Ana María; Gonzalo Lumbreras, Raquel; Izquierdo Hornillos, Roberto (01/11/1995)A reversed-phase high-performance liquid chromatography (HPLC) method for the simultaneous determination of cortisol and cortisone in human urine samples using methylprednisolone as the internal standard is described. The ... -
Solvent and solid-phase extraction of natural and synthetic corticoids in human urine
Santos Montes, Ana María; Gonzalo Lumbreras, Raquel; Gasco López, A.I.; Izquierdo Hornillos, Roberto (01/01/1994)Optimization of the main variables that affect solvent and solid-phase extraction processes, using disposable C18 cartridges and the non-ionic polymeric resin Serdolit AD-2, of human urine containing natural and synthetic ...