Iodine is an essential micronutrient essential for the production of thyroid hormones that regulate physical and mental development. Infant formula is supplemented with iodine either in the form of iodide or iodate.  This presentation describes (i) an iodide extraction method (acetic acid digestion) and (ii) an ion-chromatography with pulsed amperometric detection method, for the accurate determination of iodide in milk-based infant formula from all major US producers. The method can also be applied to soy-based infant formula. Sample preparation conditions were optimized for extracting the free and bound forms of iodide and also for reducing iodate to iodide, allowing for the determination of, total iodine (iodide + iodate) in milk- and soy-based infant formulas. The method has broad linear range (0.005-10 mg/L), high precisions (RSD <0.3% for retention time, <3% for peak area), and good recoveries. Overall, the method is shown to be fast, robust, and sensitive.

Iodide and iodate in soy- and milk-based infant formulas

245th National Meeting (2013)

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