title: Determination of clenbuterol and salbutamol in urine by capillary gas chromatography with capillary columns of 100 microns.
abstract: A method to determine clenbuterol and salbutamol in calf urine is described. Two independent extraction procedures using Extrelut (clenbuterol) and octadecylsilica (salbutamol) were used; the extracts obtained were mixed and purified over a cyanopropyl minicolumn. Trimethylsilyl derivatives were prepared and analysed by GC-MS in selected-ion monitoring mode using a fused-silica open tubular capillary column, 10 m x 100 microns coated with 5% phenylmethylsilicone. Splitless injection was optimized to achieve low percentage residual standard deviation of absolute areas. The best conditions were: injection volume 0.5 microliter, column head pressure 22 p.s.i. (1 p.s.i. = 6894.76 Pa), inlet temperature 250 degrees C and glass liner volume 250 microliters. The recoveries of the complete procedure were in the range 50-60% for both compounds.
authors.affiliation: IRTA, Unitat Tecnologia Analítica, Centre de Tecnologia de la Carn, Monells, Girona, Spain.
authors.forename: J A
authors.initials: JA
authors.lastname: García Regueiro
authors.forename: B
authors.initials: B
authors.lastname: Pérez
authors.forename: G
authors.initials: G
authors.lastname: Casademont
mesh_terms: D000420:Albuterol / Q000652:urine*; D000818:Animals; D002417:Cattle; D002849:Chromatography, Gas / Q000295:instrumentation; D002976:Clenbuterol / Q000652:urine*; D008401:Gas Chromatography-Mass Spectrometry / Q000295:instrumentation
chemical_list: D000420:Albuterol; D002976:Clenbuterol