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Development and Evaluation of a Preliminary Screening Assay for Antibiotic Residues in Meat

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Abstract

A preliminary screening assay based on a microbial chromogenic reaction was developed to detect common antibiotic residues in meat rapidly. The assay comprised two bioassays: one for Escherichia coli and another for Geobacillus stearothermophilus. The assay was optimized and evaluated for the simultaneous screening of 30 antibiotics from five common antibiotic classes (tetracyclines, aminoglycosides, macrolides, β-lactams, and quinolones) found in meat. Extraction using phosphate-acetonitrile buffer (pH 7.2) and a delipidating treatment using n-hexane resulted in a high extraction efficacy for the five antibiotics, without affecting the microbial color reaction. A carrier, polyvinyl alcohol (0.1 g/mL); a cross-linking agent, boric acid-sodium tetraborate solution (pH 5.5); and a bacterial suspension with an initial optical density of 1.0 were the optimal embedding conditions for stability, microbial activity, and chromogenic efficiency. The assay exhibited a 6-month shelf life, with detection limits of 40–60, 60–140, 60–100, 20–40, and 40–180 μg/kg for tetracyclines, aminoglycosides, macrolides, β-lactams, and quinolones, respectively, which met the European Commission (37/2010) requirements for antibiotic residue limits. Our assay results were confirmed using LC-MS/MS with 160 samples, revealing a good correlation. This study demonstrates a reliable, easy-to-use, and economical method for preliminary screening of antibiotic residues in meat. This method may find an immediate application in food safety and general testing laboratories.

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Data Availability

The data produced and/or analyzed in the current study are available from the corresponding author on reasonable request.

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Funding

This work was supported by the National Key R&D Program of China (grant number 2018YFC1603400).

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The study was conceived and designed by Shou-wei Wang, Wen-ping Guo, and Ying-ying Li. The first draft of the manuscript was written by Wei Fan. Statistical analyses were performed by Wei Fan and Xiao-yue Gao. Sections of the manuscript were written by Wei Fan, He-nan Li, and Ming-wu Zang. All authors read and approved the final manuscript.

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Correspondence to Shou-wei Wang.

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Fan, W., Gao, Xy., Zang, Mw. et al. Development and Evaluation of a Preliminary Screening Assay for Antibiotic Residues in Meat. Appl Biochem Biotechnol 193, 1129–1146 (2021). https://doi.org/10.1007/s12010-020-03462-z

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  • DOI: https://doi.org/10.1007/s12010-020-03462-z

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