PMID: 2502004Jul 1, 1989Paper

Inorganic zinc and the intestinal absorption of ferrous iron

The American Journal of Clinical Nutrition
R W CroftonP J Aggett

Abstract

The effect of inorganic zinc on the absorption of inorganic iron (Fe+2) from a solution was assessed in two studies on healthy male volunteers. In the first study coadministration of 344 mumol of zinc had no effect (p less than 0.5) on the absorption of 842 mumol of radiolabeled Fe, assessed by the area under plasma Fe increment time curve during the 3 (AUC3) and 6 (AUC6) h postadministration (Fe alone AUC3 = 176.4 +/- 39.3; AUC6 = 387 +/- 101; Fe + Zn AUC3 = 180 +/- 33.1; AUC6 = 396 +/- 73.1 mumol.h-1.L-1), total plasma content of 59Fe, and whole-body retention of 59Fe. In the second study only the plasma appearance of Fe was monitored. After administration of 421 mumol of Fe alone, the AUC3 and AUC6 were 167 +/- 21.2 and 429.4 +/- 57 mumol.h-1.L-1, respectively; these were reduced to 56.4 +/- 17 and 119 +/- 34 (p less than 0.002) by 421 mumol Zn and further reduced by 1048 mumol Zn to 33 +/- 15 and 43.4 +/- 23.8 mumol.h-1.L-1 (p less than 0.001), respectively. It is concluded that Zn can impair the intestinal absorption of Fe.

Citations

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