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Sensitive method for nontransferrin-bound iron quantification by graphite furnace atomic absorption spectrometry
A Jakeman1, T Thompson, J McHattie
1Saskatchewan Provincial Health Laboratory, 3211 Albert Street, S4S 5W6, Regina, Saskatchewan, Canada.
Clinical Biochemistry
|March 10, 2001
Summary
A new graphite furnace atomic absorption spectrometry (GFAAS) method accurately measures nontransferrin-bound iron (NTBI) in serum. This sensitive assay is crucial for diagnosing iron overload conditions like hemochromatosis.
Area of Science:
- Analytical Chemistry
- Biochemistry
- Clinical Diagnostics
Background:
- Nontransferrin-bound iron (NTBI) is a marker of iron overload and can cause cellular damage.
- Accurate measurement of NTBI is essential for diagnosing and managing iron metabolism disorders.
Purpose of the Study:
- To develop a sensitive and reliable method for quantifying NTBI in serum samples.
- To utilize graphite furnace atomic absorption spectrometry (GFAAS) for NTBI measurement.
Main Methods:
- NTBI was chelated with nitrilotriacetic acid (NTA) and ultrafiltered.
- Serum ultrafiltrates were diluted and analyzed using GFAAS.
- A magnesium nitrate matrix modifier was used for enhanced GFAAS analysis.
Main Results:
- The GFAAS method demonstrated high sensitivity with a detection limit of 0.1 micromol/L.
- Elevated NTBI levels were observed in hemochromatosis patients before phlebotomy.
- Normal NTBI values were found in individuals with high iron or ferritin but without hemochromatosis.
Conclusions:
- The developed GFAAS method offers a sensitive assay for serum NTBI quantification.
- This method is significantly more sensitive than existing colorimetric and other GFAAS techniques.
- Elevated NTBI in hemochromatosis indicates transferrin saturation and potential for iron-induced oxidative stress and organ damage.