Determination of Oxytetracycline in Salmon by Liquid Chromatography with Metal-Chelate Fluorescence Detection
A liquid chromatography (LC) method is described for the determination of oxytetracycline (OTC) in farmed Atlantic salmon muscle tissue. The method involves homogenization of salmon tissue, extraction of OTC into McIlvaine-EDTA buffer, acid precipitation of proteins, cleanup through tandem solid-phase extraction cartridges (Strata-X and aminopropyl), elution with mobile phase containing slightly alkaline buffer and Mg2+, and LC separation with metal-chelate induced fluorescence detection. Salmon tissue was fortified with 0.10, 0.25, 0.50, 0.75, and 1.0 μg/g (ppm) oxytetracycline. Average absolute recoveries were 84, 76, 70, 76, and 85%, respectively, with relative standard deviation (RSD) values all less than 9%. The interassay average recovery was 78%, with a 4.2% RSD. Determination was based on a standard graph using peak areas with standard solutions equivalent to 0.0625, 0.125, 0.25, 0.50, and 1.0 ppm in tissue. A set of 5 matrix controls (unfortified salmon tissue) were also analyzed, in which no OTC was detected. The lowest standard was used as the limit of quantitation.
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Document Type: Research Article
Affiliations: U.S. Food and Drug Administration, Seafood Products Research Center/Pacific Regional Laboratory Northwest, 22201 23rd Dr SE, Bothell, WA 98021.
Publication date: 2005-03-01
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