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Iron.

S J Fairweather-Tait¹

¹Institute of Food Research, Norwich Research Park, Colney, Norwich, United Kingdom. sue.fairweather-tait@bbsrc.ac.uk

The Journal of Nutrition

|April 4, 2001

Summary

Accurately assessing nonheme iron supplement bioavailability is crucial. Hemoglobin incorporation and fecal monitoring are top methods when isotopic labeling is possible, while Caco-2 cells offer rapid screening.

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Area of Science:

Nutritional Biochemistry
Pharmacokinetics
Gastroenterology

Background:

Accurate assessment of nonheme iron bioavailability is essential for effective supplementation and understanding iron metabolism.
Various methods exist, but their utility and limitations vary depending on the iron compound and experimental design.
Standardized and validated methods are needed to ensure reliable data for clinical and research purposes.

Purpose of the Study:

To describe the most useful and appropriate methods for assessing the bioavailability of nonheme iron supplements.
To compare the efficacy of different bioavailability assessment techniques.
To discuss strategies for normalizing results to account for variability in iron absorption.

Main Methods:

Isotopic labeling with hemoglobin incorporation and fecal monitoring for labeled supplements.
Caco-2 cell in vitro systems for rapid screening of potential absorption.
Plasma appearance/disappearance curves using intravenous iron isotopes for unlabeled compounds.
Analysis of 4- to 6-hour plasma iron concentrations for oral doses >25 mg.

Main Results:

Hemoglobin incorporation and fecal monitoring are the most accurate methods when isotopic labeling is feasible.
Caco-2 cell assays provide a quick preliminary assessment of iron absorption potential.
Plasma iron kinetics effectively quantify absorption for non-labeled iron compounds.
Oral iron doses exceeding 25 mg allow for qualitative bioavailability assessment via plasma concentration.

Conclusions:

The choice of method for assessing nonheme iron bioavailability depends on whether isotopic labeling is possible.
Hemoglobin incorporation, fecal monitoring, Caco-2 cells, and plasma iron kinetics offer distinct advantages for different scenarios.
Normalization techniques are vital for minimizing variability and ensuring the reliability of bioavailability data.

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