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Development of enrofloxacin ELISA using a monoclonal antibody tolerating an organic solvent with broad cross-reactivity to other newquinolones

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Antibacterial reagents, especially quinolones, are widely used in animals and humans, and have caused serious problems to human health because of their residual contaminants in food. In order to screen for different kinds of newquinolones at the same time, a sensitive and specific enzyme-linked immunoassay (ELISA) has been developed. The anti-enrofloxacin monoclonal antibody was selected because of its ability to react with structurally related newquinolones in organic solvent. The antibody has 100% cross-reactivity with norfloxacin, ciprofloxacin and other newquinolones at 50% inhibition of control values IC50, but not with nitroflazone, sulphadimethoxine. The lowest detection limit of this ELISA was 0.7 ng/ml (ppb) when enrofloxacin was used as the calibrator. Eel extracts were spiked with enrofloxacin and the average recoveries at 10, 50, 100 ng/ml were 98, 102 and 91%, respectively. The proposed ELISA is a useful method for the practical microquantitation of various newquinolones in biological and environmental specimens.
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Keywords: ELISA; Newquinolone; enrofloxancin; monoclonal antibody; organic solvent tolerance

Document Type: Research Article

Affiliations: 1: Frontier Institute Co., Ltd., Ishikari, Hokkaido, Japan 2: Hoshi University, Tokyo, Japan

Publication date: September 1, 2007

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