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American Journal of Clinical Nutrition, Vol 55, 473-477, Copyright © 1992 by The American Society for Clinical Nutrition, Inc
ORIGINAL RESEARCH COMMUNICATIONS |
JK Friel, VL Naake Jr, LV Miller, PV Fennessey and KM Hambidge
Department of Pediatrics and Pharmacology, University of Colorado Health Sciences Centre, Denver.
We measured isotopic enrichment in urine after oral and intravenous administration of stable isotopes of zinc to determine fractional absorption (FA). 68Zn and 70Zn were administered orally and intravenously to four normal adults. Subsequently, urine and fecal samples were collected for 7 and 14 d, respectively, ashed, and passed through ion-exchange columns to separate zinc from other elements. Samples were analyzed by fast-atom-bombardment mass spectrometry. From 32 h onwards the enrichment of 68Zn and 70Zn in urine declined proportionately so that FA could be determined as follows: FA = enrichment (oral/iv) x dose (iv/oral). FA determinations from urine and feces (cumulative excretion) were, respectively, for subject ZK1, urine 0.79 +/- 0.03 and feces 0.70 +/- 0.01; ZK2, 0.79 +/- 0.05 and 0.69 +/- 0.02; ZK3, 0.26 +/- 0.01 and 0.25 +/- 0.01; and ZK4, 0.41 +/- 0.02 and 0.37 +/- 0.02. ZK1 and ZK2 received the oral isotope while fasting whereas ZK3 and ZK4 received the oral isotope with meals. FA of zinc can be determined by measurement of isotope enrichment in urine.
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