Selective extraction of blood plasma exchangeable copper for isotope studies of dietary copper absorption

Beattie, J H, Reid, M D, Harvey, L J, Dainty, J R, Majsak-Newman, G and Fairweather-Tait, S J (2001) Selective extraction of blood plasma exchangeable copper for isotope studies of dietary copper absorption. The Analyst, 126 (12). pp. 2225-2229. ISSN 0003-2654

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Abstract

Measuring mineral absorption by fecal monitoring is labor-intensive and relies on good volunteer compliance. Blood indicators of absorption could be advantageous and we have developed a method for selective extraction-of recently absorbed (exchangeable) copper based on dialysis of plasma with histidine and subsequent copper extraction using Chelex resin. The potential for measuring copper absorption by transient enrichment of exchangeable copper with the stable isotope 65Cu from an ingested tracer, was also investigated. This method was compared with that of the fecal monitoring technique in a human volunteer, who consumed a 6 mg dose of 65Cu with inhibitors of copper absorption. Holmium was used as a non-absorbable rare-earth marker of unabsorbed tracer excretion, allowing estimation of re-secreted 65Cu (44 microg d(-1)), and hence calculation of true tracer absorption, which was only 10.8%. Monitoring plasma tracer kinetics showed potential for estimation of copper absorption without the need for fecal copper analysis.

Item Type: Article
Uncontrolled Keywords: chelating agents,copper,feces,histidine,humans,intestinal absorption,isotopes,serum albumin
Faculty \ School: Faculty of Medicine and Health Sciences > Norwich Medical School
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Depositing User: EPrints Services
Date Deposited: 25 Nov 2010 11:09
Last Modified: 28 Oct 2019 13:49
URI: https://ueaeprints.uea.ac.uk/id/eprint/12204
DOI: 10.1039/b106349a

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