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DOI: 10.1039/A805362F (Paper) Reference Section for: Analyst, 1998, 123, 2573-2578

Monoclonal-based enzyme-linked immunosorbent assay and immunochromatographic rapid assay for monensin†

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Hiroo Watanabe, Atsuko Satake, Mariko Matsumoto, Yasumasa Kido, Akio Tsuji, Katsutoshi Ito and Masako Maeda

Abstract

Monensin, a member of the ionophoric polyether antibiotics, is used primarily as a coccidiostat. A protein conjugate of monensin was prepared and utilized to produce monoclonal antibodies in the BALB/c–P3X63Ag8U.1 fusion system. Only one hybridoma that produces monoclonal antibody against monensin was isolated from one in 329 wells. The monoclonal antibody was used to develop quantitative assays for monensin by means of an enzyme-linked immunosorbent assay (ELISA). The detection limit was 1 ng ml–1 and the relative standard deviations were 2.1–6.3% intra-assay and 5.9–12.9% inter-assay. All ELISA results for assay of chicken plasma and cattle milk were confirmed using a bioassay to be used as the official method. The ELISA and bioassay results showed close correlations for plasma (r2 = 0.98, n = 25) and milk (r2 = 0.95, n = 25). Using the anti-monensin monoclonal antibodies produced, a rapid test kit based on the immunochromatographic method was developed. Detection limits of monensin for cattle milk, cattle plasma and chicken plasma were about 40, 40 and 160 ppb, respectively.

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