IMMUNOCHEMICAL STUDIES OF ADRENOCORTICOTROPIN USING TRITIUM LABELED HORMONE

Abstract
A radioimmunoassay using specifically tritiated corticotropin (3H-ACTH) of high specific radioactivity (46 Ci/mmol) and full biological activity has been developed. The assay is sensitive to ACTH in the range 200 pg-10 ng. 50% displacement of 3H-ACTH is produced by less than a twofold excess of unlabeled hormone. Immunochemical studies with various ACTH analogs showed that the antiserum recognized the intact molecule better than any of the fragments.

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