Automated column-switching high-performance liquid chromatographic determination of flumequine and oxolinic acid in extracts from fish |
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| Authors: | H H Thanh A T Andresen T Agas?ster K E Rasmussen |
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| Affiliation: | Institute of Pharmacy, University of Oslo, Norway. |
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| Abstract: | Two methods for automated analysis of extracts from edible muscle tissue of Atlantic salmon are described. Oxolinic acid and flumequine are extracted with phosphate buffer pH 9, and the extracts are analysed by high-performance liquid chromatography using a column-switching system. One method applies on-line concentration and clean-up of the extracts on a precolumn packed with polystyrene-divinylbenzene. This method was useful for the analysis of oxolinic acid and flumequine in the microgram/g range. The other method was based on on-line dialysis and concentration of the dialysate on the polymeric precolumn. This method was shown to be a reliable method for residue analysis, and the limit of detection was 2 ng/g for oxolinic acid and 3 ng/g for flumequine with fluorescence detection. |
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