Abstract
The abuse of antibiotics, such as the cephalosporins in livestock and aquaculture productions, usually causes the widespread antibiotic resistance due to their growth-promoting effects. In this study, cephalexin was chosen as the hapten molecule to prepare a broad-spectrum rabbit polyclonal antibody for cephalosporin antibiotics. The obtained antibody exhibited broad cross-reactivity ranging from 0.05% to 100% with 10 cephalosporins. Based on this antibody, we developed a broad-specific indirect competitive ELISA (ic-ELISA) for cefalexin, cefradine, cefadroxil and cefazolin with the half maximal inhibitory concentration (IC50) ranging from 0.72 to 2.99 ng/mL in working buffer. For animal-derived food samples with spiked cephalosporins, the ic-ELISA exhibited an excellent recovery ranging from 72.3% to 95.6%. To verify the accuracy of this proposed ic-ELISA, its detection performance was evaluated utilizing the high-performance liquid chromatography with satisfactory results. This study confirmed that: firstly, the prepared antibody can be used as a class-specific recognition element to develop immunoassays for cephalosporin antibiotics; and secondly, the developed ic-ELISA provided a new tool for broad-spectrum detection of first-generation cephalosporins in animal-derived foods.
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Acknowledgements
This work was financially supported by Hebei Provincial Science and Technology Department “Study on High-throughput Rapid Immunoassay Technology for Cephalosporins in Animal-derived Foods” (No. 17275502D).
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Liu, M., Sang, Y., Zhang, J. et al. Development of a Broad-Specific Competitive ELISA for First-Generation Cephalosporin Antibiotics in Animal-Derived Foods Samples. Bull Environ Contam Toxicol 107, 215–220 (2021). https://doi.org/10.1007/s00128-020-02885-y
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DOI: https://doi.org/10.1007/s00128-020-02885-y