title: Optimization of the separation of a complex mixture of natural and synthetic anabolic steroids by micellar liquid chromatography.
abstract: A systematic optimization of the HPLC separation of a complex mixture containing natural and synthetic anabolic steroids by micellar liquid chromatography using a Hypersil (150 mm x 3.0 mm i.d., 5 microm) C18 column and UV detection at 245 nm (exception is made for oxymetolone and danazol which were monitorized at 280 nm) has been carried out. The isocratic micellar mobile phases (from binary to quaternary) consisted of sodium dodecyl sulphate and organic modifiers such as acetonitrile, tetrahydrofuran, propanol, butanol or pentanol. The effect of the organic modifiers, surfactant concentration, temperature, ionic strength and flow-rate on the separation has been studied. A micellar mobile phase 5% propanol and 40 mM surfactant allowed the separation of 12 steroids out of 14 tested in about 20 min. A bivariant optimization method for the micellar mobile phase propanol-surfactant corroborated the above results.
authors: Department of Analytical Chemistry, Faculty of Chemistry, Universidad Complutense, 28040 Madrid, Spain. hornillo@qium.uccm.es
authors: R
authors: R
authors: Izquierdo-Hornillos
authors: R
authors: R
authors: Gonzalo-Lumbreras
mesh_terms: D045930:Anabolic Agents / Q000302:isolation & purification*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D008823:Micelles; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet; D013696:Temperature
chemical_list: D045930:Anabolic Agents; D008823:Micelles