Improved liquid chromatographic determination of nine currently used (fluoro)quinolones with fluorescence and mass spectrometric detection for environmental samples

• Published in: Journal of separation science 2005-08, Vol.28 (13), p.1448-1456
• Main Authors: Ferdig, Matthias, Kaleta, Agnieszka, Buchberger, Wolfgang
• Format: Article
• Language: English
• Subjects: Anti-Infective Agents - chemistry; Anti-Infective Agents - isolation & purification; Chromatography, High Pressure Liquid - methods; Chromatography, Liquid - methods; Fluorescence detection; Fluoroquinolones; Fluoroquinolones - chemistry; Fluoroquinolones - isolation & purification; Liquid chromatography; Mass spectrometry; Mass Spectrometry - methods; Models, Molecular; Molecular Structure; Quinolones - chemistry; Quinolones - isolation & purification; Sewage sludge; Spectrometry, Fluorescence - methods; Water analysis
• ISSN: 1615-9306; 1615-9314
• DOI: 10.1002/jssc.200400065

An HPLC method using C18‐modified silica as stationary phase has been developed for environmental trace analysis of nine (fluoro)quinolones. Detection is done by fluorescence measurement or MS using the modes of SIM and selected reaction monitoring (SRM). Best separation is achieved with a gradient consisting of 50 mM formic acid and methanol, which is fully compatible with MS coupling. LOQs (S/N of 10) for fluorescence detection are between 10 and 60 μg/L, depending on the analyte. MS detection (SIM and SRM) yields LOQs that are better by a factor of at least an order of magnitude. Sample preconcentration and sample clean‐up is accomplished by SPE (preconcentration factor of 1000), leading to LOQs in the low ng/L range. Recoveries of the preconcentration procedure are better than 80% for all analytes. The suitability for real samples has been demonstrated by analyzing surface waters, municipal waste waters, sewage treatment plant effluents, sewage sludge, and sediment taken from rivers and fish ponds. The method should also be useful for determination of residues of (fluoro)quinolones in food or other matrices. The degradation of the (fluoro)quinolones has been examined over 5 days in order to get information about the decomposition rate and the degradation products eventually occurring in the environment.