An antigen based on molecular modeling resulted in the development of a monoclonal antibody-based immunoassay for the coccidiostat nicarbazin

Based on insights obtained from computer-assisted molecular modeling, p-nit rosuccinanilic acid was selected as a viable candidate to use as a hapten t o produce antibodies to 4,4 ' -dinitrocarbanilide, the active component of the coccidiostat nicarbazin. These antibodies would be used to quantify nic arbazin in feeds and tissues. The synthesis of p-nitrosuccinanilic acid is presented here. Due to the lack of water solubility of nicarbazin, a discus sion is presented concerning the solubility of nicarbazin as it pertains to the immunoassay. DMF and ACN were both added to the assay buffer to make s tandard solutions of nicarbazin, and facilitate the use of the competition enzyme-linked immunosorbent assays (ELISAs). Monoclonal antibodies were iso lated that compete with nicarbazin, and they were isotyped as IgM. However, this study has been complicated due to problems that developed during the study associated with the competition ELISA. Published by Elsevier Science B.V.