›› 2015, Vol. 42 ›› Issue (10): 2625-2630.doi: 10.16431/j.cnki.1671-7236.2015.10.017

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Establishment of Indirect Competitive Enzyme-linked Immunosorbent Assay for Tilmicosin in Milk

HAN Qing1, WANG Jing2, XU Hao1, YANG Juan1   

  1. 1. Linyi Entry-exit Inspection and Quarantine Bureau, Linyi 276034, China;
    2. Weihai Entry-exit Inspection and Quarantine Bureau, Weihai 264205, China
  • Received:2015-04-08 Online:2015-10-20 Published:2015-10-23

Abstract: An indirect competitive enzyme-linked immunosorbent assay (ELISA) for detecting tilmicosin residue in milk was developed and applied to milk samples after the determination of dilution of coating antigen and antibody to timicosin by using checkerboard method,and the optimization of coating condition,reaction time and temperature,and reaction time of enzyme-labled secondary antibody.The results showed that the 50% inhibition concentration (IC50) of the indirect competitive ELISA was 2.1 ng/mL and the limit of detection (LOD) of tilmicosin in milk was 2 μg/L.The recoveries of tilmicosin added in milk at 5,10 and 20 μg/L ranged from 79.2% to 90.1% with the coefficients of variation (CV) not higher than 9.0%.The indirect competitive ELISA would not react with other common macrolide drugs.The sensitivity of indirect competitive ELISA developed in the study complied to the maximum residue limit of tilmicosin set by China,and laid the foundation for the test kit of the rapid detection of tilmicosin in milk.

Key words: indirect competitive enzyme-linked immunosorbent assay (ELISA); tilmicosin; milk; residue

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