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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. ... -
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 ... -
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, ... -
Simultaneous determination of dexamethasone and betamethasone in pharmaceuticals by reversed-phase HPLC
Santos Montes, Ana María; Gasco López, A.I.; Izquierdo Hornillos, Roberto (01/11/1994)An HPLC method for the simultaneous determination of the glucocorticoids betamethasone and dexamethasone is described. The method based on the separation of these compounds using a binary watertetrahyddrofuran mobile phase ... -
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 ... -
The effect of different amines added to eluents as silanol masking agents on the chromatographic behavior of some diuretics in reversed-phase high-performance liquid chromatography using C18 packings.
Gasco López, A.I.; Santos Montes, Ana María; Izquierdo Hornillos, Roberto (01/11/1997)A preliminary gradient separation in reversed-phase liquid chromatography of a mixture of 25 solutes (diuretics, probenecide, and atenolol) is carried out using several C18 columns and an aqueous phosphoric acid solution ...