title: 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.
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 IC(50) 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.
authors.affiliation: College of Life Science, Chongqing Normal University, Chongqing 401331, China.
authors.forename: T
authors.initials: T
authors.lastname: Le
authors.forename: J
authors.initials: J
authors.lastname: Xu
authors.forename: Y-Y
authors.initials: YY
authors.lastname: Jia
authors.forename: H-Q
authors.initials: HQ
authors.lastname: He
authors.forename: X-D
authors.initials: XD
authors.lastname: Niu
authors.forename: Y
authors.initials: Y
authors.lastname: Chen
mesh_terms: D000818:Animals; D002218:Carbadox / Q000378:metabolism*; D002846:Chromatography, Affinity / Q000379:methods*; D002851:Chromatography, High Pressure Liquid; D003429:Cross Reactions; D004350:Drug Residues / Q000032:analysis* / Q000378:metabolism; D004797:Enzyme-Linked Immunosorbent Assay; D006046:Gold / Q000737:chemistry; D020128:Inhibitory Concentration 50; D057230:Limit of Detection; D053768:Metal Nanoparticles; D009153:Mutagens / Q000378:metabolism*; D011810:Quinoxalines / Q000032:analysis* / Q000378:metabolism
chemical_list: D009153:Mutagens; D011810:Quinoxalines; D006046:Gold; D002218:Carbadox; C042218:quinoxaline-2-carboxylic acid