摘要
Modified 1-ethyl-3-(3-dimethylaminopropy) carbodiimide(EDC) method was employed to synthesize the artificial antigen of enrofloxacin(ENR),and New Zealand rabbits were used to produce anti-ENR polyclonal antibody(pAb).Based on the checkerboard titration,an indirect competitive enzyme-linked immunosorbent assay(ELISA) standard curve was established.This assay was sensitive and had a linear range from 0.6 to 148.0 μg/kg(R2=0.9567),with the half maximal inhibitory concentration(IC50) and limit of detection(LOD) values of 9.4 μg/kg and 0.2 μg/kg,respectively.Of all the competitive analogues,the produced pAb exhibited a high cross-reactivity to ciprofloxacin(CIP)(87%),the main metabolite of ENR in tissues.After optimization,the matrix effects can be ignored using a 10-fold dilution in beef and 20-fold dilution in pork.The overall recoveries and coefficients of variation(CVs) were in the ranges of 86%-109% and 6.8%-13.1%,respectively.It can be concluded that the established ELISA method is suitable for simultaneous detection of ENR and CIP in animal tissues.
Modified 1-ethyl-3-（3-dimethylaminopropy） carbodiimide （EDC） method was employed to synthesize the artificial antigen of enrofloxacin （ENR）, and New Zealand rabbits were used to produce anti-ENR polyclonal antibody （pAb）. Based on the checkerboard titration, an indirect competitive enzyme-linked immunosorbent assay （ELISA） standard curve was established. This assay was sensitive and had a linear range from 0.6 to 148.0 μg/kg （R2=0.9567）, with the half maximal inhibitory concentration （IC50） and limit of detection （LOD） values of 9.4 μg/kg and 0.2 μg/kg, respectively. Of all the competitive analogues, the produced pAb exhibited a high cross-reactivity to ciprofloxacin （CIP） （87%）, the main metabolite of ENR in tissues. After optimization, the matrix effects can be ignored using a 10-fold dilution in beef and 20-fold dilution in pork. The overall recoveries and coefficients of variation （CVs） were in the ranges of 86%-109% and 6.8%-13.1%, respectively. It can be concluded that the established ELISA method is suitable for simultaneous detection of ENR and CIP in animal tissues.
基金
supported by the Henan Innovation Project for University Prominent Research Talents (No. 2010HASTIT026)
the Key Scientific & Technological Project of Education Department in Henan Province of China (No. 2011A230003)
