British Journal of Nutrition

General Nutrition

Dietary ascorbic acid raises iron absorption in anaemic rats through enhancing mucosal iron uptake independent of iron solubility in the digesta

K. J. H. Wienka1, J. J. M. Marxa2, M. Santosa2, A. G. Lemmensa1, E. J. Brinka3 p1, R. Van Der Meera4 and A. C. Beynena1

a1 Department of Laboratory Animal Science, Utrecht University, PO Box 80.166, 3508 TD Utrecht, The Netherlands

a2 Eijkman-Winkler Institute and Department of Internal Medicine, University Hospital Utrecht, The Netherlands

a3 Unilever Research Laboratorium, Vlaardingen, The Netherlands

a4 Netherlands Institute for Dairy Research, Ede, The Netherlands

Abstract

We studied Fe absorption from FeSO4 in rats with Fe deficiency-induced anaemia that were given an Fe-sufficient purified diet without or with ascorbic acid (10·4 g/kg diet). Attention was focused on mucosal Fe uptake as measured in vivo by a double-isotope technique. Haemoglobin repletion and liver Fe levels were not affected when the ascorbic acid-supplemented diet was given, but apparent Fe absorption and retention of orally administered 59Fe were significantly enhanced. The distribution of Fe between liquid and solid phases of contents of both the stomach and the proximal intestine was not affected by the feeding of the ascorbic acid, but ascorbic acid significantly enhanced mucosal Fe uptake. It is concluded that ascorbic acid in the diet raises mucosal Fe uptake through a mechanism independent of the intestinal Fe solubility.

(Received February 28 1996)

(Revised May 14 1996)

(Accepted June 10 1996)

Correspondence:

p1 Present address: Institute for Animal Science and Health, Lelystad, The Netherlands.

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