A quantum dot-based immunoassay for screening of tylosin and tilmicosin in edible animal tissues
Abstract
A rapid, indirect competitive fluorescence-linked immunosorbent assay (ic-FLISA) based on quantum dots (QDs) as the fluorescent marker was developed for the detection of tylosin and tilmicosin in edible animal tissues. The end point fluorescent detection system was carried out using QDs conjugated with goat anti-mouse secondary antibody. The limits of detection (LODs) for the determination of tylosin and tilmicosin were 0.02 and 0.04 μg kg–1, respectively. This detection method was used to analyse spiked samples and the recoveries ranged from 83.5% to 98.7% for tylosin and from 81.8% to 98.2% for tilmicosin. In real porcine tissue sample analysis, the results of ic-FLISA were similar to those obtained from an indirect competitive enzyme-linked immunosorbent assay (ic-ELISA) to an HPLC method indicating its potential for tylosin and tilmicosin screening in edible animal tissues.
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