title: Ion chromatographic determination of thyroxine in urine.
abstract: Thyroxine (3,5,3',5'-tetraiodo thyronine) is administered to patients suffering from endemic goiter as also in cases of non-iodine deficient ethiology and hypothyroidism. It is suggested that the uptake of thyroxine can be monitored by assessing the levels of the same in the urine of patients under treatment. For the purpose, a highly sensitive and selective ion chromatographic procedure is developed. The sample of urine is treated with sodium hydroxide and UV irradiated to convert iodine in thyroxine to iodide. Subsequently, iodide is separated on an anion exchanger AS 4A column using 50 mM NaOH as the eluent and determined spectrophotometrically at 226 nm.
authors.affiliation: Centre for Marine Analytical Reference and Standards, Regional Research Laboratory (CSIR), Trivandrum 695019, India.
authors.forename: L
authors.initials: L
authors.lastname: Bhavana
authors.forename: V J
authors.initials: VJ
authors.lastname: Ajimon
authors.forename: S L
authors.initials: SL
authors.lastname: Radhika
authors.forename: M
authors.initials: M
authors.lastname: Sindhu
authors.forename: C S P
authors.initials: CS
authors.lastname: Iyer
mesh_terms: D002852:Chromatography, Ion Exchange / Q000379:methods*; D006801:Humans; D013056:Spectrophotometry, Ultraviolet; D013974:Thyroxine / Q000652:urine*
chemical_list: D013974:Thyroxine