Abstract
ABSTRACTA rapid and sensitive immunochromatographic test strip (ICTS) was developed in a competitive format with the quantum dot-conjugated monoclonal antibody specifically to determine the residues of oxytetracycline (OTC) and its metabolite 4-epi-oxytetracycline (4-epi-OTC). Using an ICTS reader, the 50% inhibition concentration (IC50) was found to be 3.41 ± 0.29 ng ml–1 of OTC in phosphate-buffered saline samples and the detection limit was 0.44 ± 0.05 ng ml–1. The visual cut-off level of the ICTS is 25 ng ml–1. The recoveries from tissue samples spiked with OTC of 50–600 μg kg–1 were 74.2–107.2%, with coefficients of variation below 15%. The method was used to analyse incurred tissue samples, and there was good correlation (R2 = 0.999) between the ICTS and high-performance liquid chromatography. These results indicate that ICTS is suitable for the rapid and quantitative detection of OTC and 4-epi-OTC residues in edible animal tissues.
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