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Abstract
A specific enzyme immunoassay (EIA) method has been developed for 17 alpha-estradiol 17-N-acetylglucosaminide as a model compound instead of 15 alpha-hydroxyestrogen 15-N-acetylglucosaminides. Two new haptens, 3-(omega-carboxyalkyl) ether derivatives of 17-alpha-estradiol 17-N-acetylglucosaminide, were synthesized and conjugated with bovine serum albumin (BSA). The EIA was newly established using specific antiserum elicited against 3-(1-carboxypropyl) ether of 17 alpha-estradiol 17-N-acetylglucosaminide (17NAG CPE)-BSA conjugate and beta-galactosidase-labeled 17NAG CPE as a labeled antigen. An appropriate dose-response curve of EIA for 17 alpha-estradiol 17-N-acetylglucosaminide was obtained in the range of 20-1000 pg/tube. The specificity of EIA proved to be satisfactory in terms of cross-reactivities to related compounds including 15 alpha-N-acetylglucosaminides. The proposed method will be applicable to the preparation of antisera for use in EIA of 15 alpha-hydroxyestrogen 15-N-acetylglucosaminides.
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