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Effect of the hapten linking arm on cross-reactivity of sulfonamide-specific antibodies in ELISA

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Competitive enzyme-linked immunosorbent assay (ELISA) was used to explore the influence of the linking arm (azo or succinyl) of sulfonamide-protein immunogens on polyclonal antibody (pAb) cross-reactivity to sulfonamide N 1 -analogues, N 4 -derivatives, or N 4 -protein conjugates. In addition to the sulfonamide's overall size and N 1 -substituent structure, the dominant sulfonamide epitope of the immunogen was defined by the linking arm. Antibodies made from immunizations with azo and succinyl immunogens possessed 12- and 16-fold greater affinity for their N 4 -derivatives, respectively, compared to the underivatized sulfonamide form.
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Keywords: Polyclonal antibody; cross-reactivity; hapten design; linking arm effect; sulfonamide

Document Type: Research Article

Affiliations: Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada

Publication date: December 1, 2005

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