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- W2049766610 abstract "Biosensor-based immunochemical screening assays for the detection of sulfadiazine (SDZ) and sulfamethazine (SMT) in muscle extract from pigs were developed. Samples were extracted with aqueous buffer and then centrifuged. This simple and straightforward preparation allowed up to 40 samples to be processed and analysed in 1 d. The limits of detection for the assays were found to be 5.6 ng g−1 for SDZ and 7.4 ng g−1 for SMT. These figures were well below the European and US legal limits for sulfonamides (100 ng g−1). The precision (RSD) between runs was <8% and the recovery was between 91 and 98%. The validation proved the assays to be accurate and the analysis of routine field samples showed good correlation with an established TLC screening procedure. No false negative or positive results were obtained with blank and spiked samples. The influence of cross-reacting metabolites on immunoassays was demonstrated by testing incurred tissue samples, collected from sulfonamide treated pigs after only a short withdrawal period. The quantitative results obtained by biosensor analysis were a combination of parent sulfonamide plus N4-acetyl metabolite while the HPLC method used for confirmatory analysis detected only the parent sulfonamide. This gave rise to some false positive results and highlighted the need to use real samples in evaluating any assay thoroughly. False negative results were not obtained." @default.
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- W2049766610 date "2000-01-01" @default.
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- W2049766610 title "Biosensor assay of sulfadiazine and sulfamethazine residues in pork" @default.
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- W2049766610 doi "https://doi.org/10.1039/b004835f" @default.
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