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Clinical Chemistry 36: 24-27, 1990;
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Clinical Chemistry, Vol 36, 24-27, Copyright © 1990 by American Association for Clinical Chemistry

Competitive binding enzyme immunoassay for zonisamide, a new antiepileptic drug, with selected paired-enzyme labeled antigen and antibody [published erratum appears in Clin Chem 1990 Aug;36(8 Pt 1):1530]

K Kalbe, S Nishimura, H Ishii, N Sunahara, S Naruto and S Kurooka
Research Laboratories, Dainippon Pharmaceutical Co., Ltd., Osaka, Japan.

We assessed the competitive binding between zonisamide (ZNS) in serum samples and beta-galactosidase-labeled ZNS derivatives, using competing antibodies to ZNS derivatives, and selected the best enzyme-labeled antigen and antibody for accurate enzyme immunoassay (EIA) of ZNS in serum without interference from its metabolites or from other antiepileptic drugs. This EIA, based on use of antibody linked to bacterial cell walls, has advantages over HPLC in simplicity, speed (50 samples per hour), and lack of requirement for special equipment. The concentrations of ZNS in serum as measured by the EIA correlated well with those by HPLC (n = 33, r = 0.977).




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