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Original Articles

Development and validation of an immunochromatographic assay for the rapid detection of quinoxaline-2-carboxylic acid, the major metabolite of carbadox in the edible tissues of pigs

, , , , &
Pages 925-934 | Received 18 Dec 2011, Accepted 29 Jan 2012, Published online: 16 Mar 2012
 

Abstract

A new method was developed for the determination of quinoxaline-2-carboxylic acid, the marker residue of carbadox, in the edible tissues of food-producing animals using a colloidal gold probe-based immunochromatographic assay. The highly specific polyclonal antibody (PcAb), which was very sensitive to N-butylquinoxaline-2-carboxylic acid (BQCA) with an IC50 value of 2.38 ng ml−1, was selected for the development of an immunochromatographic assay (ICA). Only 5 min were required to perform this assay; it had a visual detection limit of 25 ng g−1 for quinoxaline-2-carboxylic acid. The results of the analysis of quinoxaline-2-carboxylic acid in animal tissues using the immunochromatographic assay showed good agreement with those obtained by HPLC. In conclusion, the method was rapid and accurate for screening residues of carbadox in the edible tissues of food-producing animals.

Acknowledgements

This project was supported by the Scientific and Technological Research Project of Chongqing China (CSTC2011ggB10009), Natural Science Foundation of Chongqing Education Committee (KJ110605) and Chongqing Normal University.

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