Concurrent determination of four fluoroquinolones in catfish, shrimp, and salmon by liquid chromatography with fluorescence detection

• Published in: Journal of AOAC International 2002-11, Vol.85 (6), p.1293-1301
• Main Authors: ROYBAL, José E, WALKER, Calvin C, PFENNING, Allen P, TURNIPSEED, Sherri B, STOREY, Joseph M, GONZALES, Steve A, HURLBUT, Jeffrey A
• Format: Article
• Language: English
• Subjects: Animals; Anti-Infective Agents - analysis; Biological and medical sciences; Calibration; Catfishes - metabolism; Chromatography, Liquid; Fish and seafood industries; Fluoroquinolones; Food industries; Food toxicology; Fundamental and applied biological sciences. Psychology; Indicators and Reagents; Milk - chemistry; Muscle, Skeletal - chemistry; Penaeidae - chemistry; Quality Control; Reference Standards; Salmon - metabolism; Solutions; Spectrometry, Fluorescence
• ISSN: 1060-3271; 1944-7922
• DOI: 10.1093/jaoac/85.6.1293

A liquid chromatographic (LC) method with fluorescence detection was developed for concurrent determination of 4 fluoroquinolones: ciprofloxacin (CIPRO), enrofloxacin (ENRO), sarafloxacin (SARA), and difloxacin (DIFLX) in catfish, shrimp, and salmon. The procedure consists of extraction from fish tissue with acidified ethanol, isolation and retention on a cation exchange solid-phase extraction column, elution with basic methanol, and LC analysis with fluorescence detection. LC is performed by isocratic elution with acetonitrile-2% acetic acid (16 + 84) mobile phase, and a PLRP-S polymer column with fluorescence detection, excitation 278 nm and emission 450 nm. A target level of 20 ppb for each of the 4 fluoroquinolones has been established for this method. Fortified and incurred fish sample results are based on a 5-point standard curve calculation (10-160 ppb). Overall percent recoveries (% relative standard deviation) from fortified catfish were 78 (10), 80 (11), 70 (9.4), and 78 (10); from fortified shrimp, 69 (5.9), 85 (4.9), 79 (5.9), and 90 (4.5); and from fortified salmon, 56 (15), 93 (5.6), 61 (11), and 87 (5.0) for CIPRO, ENRO, SARA, and DIFLX, respectively. Data from the analysis of fluoroquinolone-incurred catfish, shrimp, and salmon are presented.