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Abstract Title:

Perchlorate and iodide in dairy and breast milk.

Abstract Source:

Environ Sci Technol. 2005 Apr 1;39(7):2011-7. PMID: 15871231

Abstract Author(s):

Andrea B Kirk, P Kalyani Martinelango, Kang Tian, Aniruddha Dutta, Ernest E Smith, Purnendu K Dasgupta

Article Affiliation:

The Institute of Environmental and Human Health, Texas Tech University, Lubbock, Texas 79409-1163, USA.

Abstract:

Perchlorate inhibits iodide uptake and may impair thyroid and neurodevelopment in infants. Recently, we unambiguously identified the presence of perchlorate in all seven brands of dairy milk randomly purchased from grocery stores in Lubbock, TX. How widespread is perchlorate in milk? Perchlorate in 47 dairy milk samples from 11 states and in 36 human milk samples from 18 states were measured. Iodide was also measured in a number of the samples. Perchlorate was detectable in 81 of 82 samples. The dairy and breast milk means were, respectively, 2.0 and 10.5 microg/L with the corresponding maximum values of 11 and 92 microg/L. Perchlorate is present in virtually all milk samples, the average concentration in breast milk is five times higher than in dairy milk. Although the number of available measurements are few at this point, for breast milk samples with a perchlorate content greater than 10 microg/L, the iodide content is linearly correlated with the inverse of the perchlorate concentration with a r2 of>0.9 (n = 6). The presence of perchlorate in the milk lowers the iodide content and may impair thyroid development in infants. On the basis of limited available data, iodide levels in breast milk may be significantly lower than it was two decades ago. Recommended iodine intake by pregnant and lactating women may need to be revised upward.

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Sayer Ji
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