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Human iodine requirements determined by the saturation kinetics model
Mohammed H Hassanien1, Laila A Hussein, Erica N Robinson
1Department of Nutrition, National Research Center, Dokki, Cairo, Egypt.
The Journal of Nutritional Biochemistry
|July 2, 2003
Summary
Iodine deficiency disorders (IDD) can be mitigated by using urinary iodine levels to guide salt iodination. Mathematical modeling suggests 63 mg/kg salt iodination is effective, but commercial salt quality varies widely, necessitating supervision.
Area of Science:
- Endocrinology
- Public Health Nutrition
- Mathematical Modeling in Biology
Background:
- Iodine is crucial for metabolism, brain development, and preventing iodine deficiency disorders (IDD).
- IDD manifests in various health issues, including goiter, developmental defects, and neurological impairments.
Purpose of the Study:
- To assess iodine utilization using urinary iodine excretion parameters.
- To determine optimal salt iodination levels for preventing IDD.
- To evaluate the accuracy of commercially available salt iodination.
Main Methods:
- Application of a mathematical model based on Michaelis-Menten enzyme kinetics to urinary iodine data.
- Analysis of iodine excretion parameters using a four-parameter saturation kinetics model.
- Iodiometric titration to determine iodination levels in commercially available salt.
Main Results:
- A salt iodination level of 63 mg/kg was found to reduce IDD severity.
- 83% of subjects achieved optimal urinary iodine excretion (1.18 micromol/L) with this level.
- Only 20% of commercial salt samples met label claims, with significant batch variability (-95% to +150%).
Conclusions:
- Urinary iodine excretion parameters offer a non-invasive method to monitor iodine status and guide salt iodination.
- Careful supervision of salt iodination is essential to ensure adequate iodine delivery and prevent IDD.