title: [Investigation on the synthesis of 125I labelled triiodothyronine and thyroxine of high specific radioactivity (author's transl)].
abstract: The reaction conditions of the monoiodination of L-diiodothyronine and L-triiodothyronine by nonradioactive iodide have been investigated by separation of the reaction mixture on sephadex G-25 with sodium hydroxide 10 mmol/l as eluent and quantitative iodine estimation in the eluate. When labelling with 125I was performed under optimal conditions, a good yield of chromatographically pure L-triiodothyronine or L-thyroxine was obtained with a specific radioactivity between 2 and 3 Ci/mg. The synthesized labelled hormones were tested by radioimmunoassay. They enable a detection of less than 2 pg T3 and less than 5 pg T4.
mesh_terms: D002700:Chloramines / Q000494:pharmacology; D002850:Chromatography, Gel; D004355:Drug Stability; D007454:Iodides; D007457:Iodine Radioisotopes; D007553:Isotope Labeling; D011863:Radioimmunoassay; D013970:Thyronines; D013974:Thyroxine / Q000032:analysis / Q000138:chemical synthesis; D014284:Triiodothyronine / Q000032:analysis / Q000138:chemical synthesis
chemical_list: D002700:Chloramines; D007454:Iodides; D007457:Iodine Radioisotopes; D013970:Thyronines; D014284:Triiodothyronine; D013974:Thyroxine
vernacular_title: Untersuchungen zur Herstellung von 125J-markiertem Trijodthyronin und Thyroxin mit hoher spezifischer Radioaktivität