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Clinical Chemistry 26: 327-331, 1980;
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Clinical Chemistry, Vol 26, 327-331, Copyright © 1980 by American Association for Clinical Chemistry

Improved direct specific determination of serum iron and total iron- binding capacity

F Ceriotti and G Ceriotti

Serum iron is released from transferrin and reduced at pH 1.7 by treating serum with a 10 g/L ascorbic acid solution in 0.1 mol/L HCl. When ferrozine is added to this reagent, it forms a complex with iron that is as intensely colored as at higher pH values, and under these conditions no turbidity is produced. The second major interference, that from copper, is eliminated by adding 1 g of thiosemicarbazide per liter, which at a low pH forms a stable, uncolored complex with copper without affecting the reaction of ferrozine with iron.


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