title: Direct solid-phase 125I radioimmunoassay of serum cortisol.
abstract: We report a solid-phase iodine- 125 radioimmunoassay for serum cortisol in which the interfering binding proteins are inactivated by a combination of reaction pH and 8-anilino-1-naphthalenesulfonic acid. The procedure is easy to perform and gives accurate and reliable results. The shift in pH for optimum binding of an antibody resulting from immobilization on a solid support, used to decrease cortisol binding competition in the present test, is potentially exploitable in other antibody and enzyme systems.
mesh_terms: D000817:Anilino Naphthalenesulfonates; D003429:Cross Reactions; D006801:Humans; D006854:Hydrocortisone / Q000097:blood*; D007457:Iodine Radioisotopes; D011863:Radioimmunoassay / Q000379:methods
chemical_list: D000817:Anilino Naphthalenesulfonates; D007457:Iodine Radioisotopes; D006854:Hydrocortisone