Determination of morphine and its analogues in urine by on-line coupled reversed-phase liquid chromatography-gas chromatography with on-line derivatization

1997 ◽  
Vol 771 (1-2) ◽  
pp. 360-365 ◽  
Author(s):  
Tuulia Hyötyläinen ◽  
Helena Keski-Hynnilä ◽  
Marja-Liisa Riekkola
Keyword(s):  
Gas Chromatography ◽  
Liquid Chromatography ◽  
Reversed Phase ◽  
Reversed Phase Liquid Chromatography ◽  
On Line ◽  
Phase Liquid

scholarly journals Multiresidue Determination of Fluoroquinolones in Eggs

2000 ◽  
Vol 83 (6) ◽  
pp. 1306-1312 ◽  
Author(s):  
Marilyn J Schneider ◽  
Dan J Donoghue
Keyword(s):  
Liquid Chromatography ◽  
Fluorescence Detection ◽  
Small Volume ◽  
Reversed Phase ◽  
Reversed Phase Liquid Chromatography ◽  
Trace Enrichment ◽  
On Line ◽  
Phase Liquid ◽  
Multiresidue Determination

Abstract A multiresidue method was developed for the determination of fluoroquinolones in eggs. Extraction of eggs with ammoniacal acetonitrile was followed by liquid–liquid defatting, solvent evaporation, and redissolution in a small volume of buffer. The fluoroquinolones were further purified by on-line microdialysis, concentrated on a trace enrichment column, and separated by reversed-phase liquid chromatography with fluorescence detection. Norfloxacin (NOR), ciprofloxacin (CIP), and sarafloxacin (SAR) were extracted from fortified eggs over a range of 2–200 μg/kg, with recoveries of 65.7–78.9%, 65.6–77.1%, and 67.6–110%, respectively. Enrofloxacin (ENRO) was extracted over a range of 1–100 μg/kg, with recoveries of 71.5–86.7%, whereas desethylene ciprofloxacin (DCIP) and danofloxacin (DANO) were extracted over a range of 0.2–20 μg/kg, with recoveries of 68.7–90.7% and 76.0–93.8%, respectively. The limits of quantitation for the 6 fluoroquinolones were as follows: DCIP and DANO, 0.3 μg/kg; ENRO, 1 μg/kg; NOR and CIP, 2 μg/kg; and SAR, 3 μg/kg. Both SAR and ENRO incurred eggs were also successfully analyzed using this method.

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