A quantitative method for the separation of thyroid hormones and related compounds from serum and tissues with an anion-exchange resin

Abstract
The thyroid hormones and related compounds can be separated from biological material by absorption on the ion-exchange resin Dowex-1 equilibrated with acetic acid-sodium acetate buffer at pH 5.6. The iodinated compounds are quantitatively eluted when the pH is reduced with acetic acid solutions of increasing concentration. Thyroglobulin, monoiodotyrosine and diodotyrosine are eluted at pH 3.6, 3.0 and 2.2 respectively and thyroxine and triiodothyronine are eluted at pH 1.4. Iodide remains on the resin throughout. Dowex-1 can therefore be used to concentrate the thyroid hormones in biological material for chromatographie analysis.