Conclusions
For both types of samples the bigger amount of iodine is in the whey fraction, between 80% and 90% whereas in the fat there is about a 2% of the total iodine and in the casein fraction the levels are between 5% and 10% depending on the type sample.
The major difference between the breast milk and infant formula is the presence in the latter of a macromolecular compound comprising more than 50% of the iodine present in the preparation. The infant formulas are similar to the human milk in the iodine distribution in the different milk fractions. The different levels observed for the human milks can be due to the mother feeding.