The Assay of Iron‐poly (sorbitol‐gluconic acid) complex (Ferastral®) and its Separation from Transferrin in Serum

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Abstract
A new iron-poly (sorbitol-gluconic acid) complex (Ferastral®) has been studied. A method of assay is described. The iron complex may be separated from serum transferrin using a Sephadex DEAE A50 column. This binds the iron complex and elutes iron-transferrin which can then be assayed. It is shown that the assay of serum transferrin unsaturated binding capacity using excess 59FeCl3 and MgCO3 adsorption, is valid in the presence of Ferastral. Serum unsaturated iron binding capacity may therefore be used to follow the binding of Ferastral iron by transferrin. These methods may be used to follow the distribution of iron in plasma after an intramuscular injection of Ferastral.

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