title: Analysis of macrolide antibiotics in river water by solid-phase extraction and liquid chromatography-mass spectrometry.
abstract: A liquid chromatography-mass spectrometry (LC-MS) method was developed for the determination of five macrolides in natural water samples, using kitasamycin as surrogate. The macrolides were extracted from water samples using Oasis HLB cartridges. Pre-concentration factors up to 250 were obtained. Separation was carried out in an end-capped silica-based C18 column and mobile phases consisting of water/acetonitrile mixtures containing ammonium acetate. Detection was performed by mass spectrometry with a single quadrupole and a triple quadrupole using an electrospray interface. The quality parameters obtained with these two approaches were compared. The detection limits of the whole process were about 1 ng l(-1). The recoveries from 250 ml of water samples spiked at 25-125 ng l(-1) level were in the range 85-115%, except for azithromycin levels, which were around 70%. Erythromycin-H2O, clarithromycin and azithromyzin were found, at the sub ng l(-1) level, in the studied rivers.
authors.affiliation: Departament de Química Analítica, Universitat de Barcelona, Martí i Franquès, 1-11, E-08028 Barcelona, Spain.
authors.forename: Sònia
authors.initials: S
authors.lastname: Abuin
authors.forename: Rosa
authors.initials: R
authors.lastname: Codony
authors.forename: Ramon
authors.initials: R
authors.lastname: Compañó
authors.forename: Mercè
authors.initials: M
authors.lastname: Granados
authors.forename: Maria Dolors
authors.initials: MD
authors.lastname: Prat
mesh_terms: D000900:Anti-Bacterial Agents / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D000900:Anti-Bacterial Agents; D014874:Water Pollutants, Chemical