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An iron stable isotope comparison between human erythrocytes and plasma

von Blanckenburg, Friedhelm and Oelze, Marcus and Schmid, Dietmar and Moeller, Kirsten and Gschwind, Hans-Peter and Slade, Alan and Stitah, Sylvie and Kaufmann, Daniel and Swart, Pieter Jacob (2014) An iron stable isotope comparison between human erythrocytes and plasma. Metallomics, 6 (11). pp. 2052-2061. ISSN 1756591X

Abstract

We present precise iron stable isotope ratios measured by multicollector-ICP mass spectrometry (MC-ICP-MS) of human red blood cells (erythrocytes) and blood plasma from 12 healthy male adults taken during a clinical study. The accurate determination of stable isotope ratios in plasma first required substantial method development work, as minor iron amounts in plasma had to be separated from a large organic matrix prior to mass-spectrometric analysis to avoid spectroscopic interferences and shifts in the mass spectrometer's mass-bias. The <sup>56</sup>Fe/<sup>54</sup>Fe ratio in erythrocytes, expressed as permil difference from the "IRMM-014" iron reference standard (δ<sup>56/54</sup>Fe), ranges from -3.1‰ to -2.2‰, a range typical for male Caucasian adults. The individual subject erythrocyte iron isotope composition can be regarded as uniform over the 21 days investigated, as variations (±0.059 to ±0.15‰) are mostly within the analytical precision of reference materials. In plasma, δ<sup>56/54</sup>Fe values measured in two different laboratories range from -3.0‰ to -2.0‰, and are on average 0.24‰ higher than those in erythrocytes. However, this difference is barely resolvable within one standard deviation of the differences (0.22‰). Taking into account the possible contamination due to hemolysis (iron concentrations are only 0.4 to 2 ppm in plasma compared to approx. 480 ppm in erythrocytes), we model the pure plasma δ<sup>56/54</sup>Fe to be on average 0.4‰ higher than that in erythrocytes. Hence, the plasma iron isotope signature lies between that of the liver and that of erythrocytes. This difference can be explained by redox processes involved during cycling of iron between transferrin and ferritin.

Item Type: Article
Additional Information: This publication manuscript refers to a companion paper "Ferrokinetics in blood and plasma and iron uptake in healthy male subjects following oral administration of SBR759 labeled with the stable isotope 58Fe" submitted in parallel to Metallomics Journal.
Date Deposited: 20 Oct 2017 00:45
Last Modified: 25 Jan 2019 00:46
URI: https://oak.novartis.com/id/eprint/8996

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