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The availability of zinc in endosperm, whole grain and bran-enriched wheat crispbreads fed to rats on a Zn-deficient diet

Published online by Cambridge University Press:  09 March 2007

Göran Hallmans ,
Rolf Sjöström ,
Lars Wetter  and
Kenneth R. Wing
Göran Hallmans
Affiliation:
Departments of Nutritional Research, University of Umeå, S-901 87 Umeå, Sweden Departments of Pathology, University of Umeå, S-901 87 Umeå, Sweden
Rolf Sjöström
Affiliation:
Departments of Biophysics Laboratory, University of Umeå, S-901 87 Umeå, Sweden
Lars Wetter
Affiliation:
Departments of Pathology, University of Umeå, S-901 87 Umeå, Sweden Departments of Plastic Surgery, University of Umeå, S-901 87 Umeå, Sweden
Kenneth R. Wing
Affiliation:
Departments of Oral Radiology, University of Umeå, S-901 87 Umeå, Sweden
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Abstract

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The hypothesis that factors such as dietary fibre and phytate in wheat bran limit the availability of Zn was tested in growing rats fed on low-Zn diets with different wheat crispbreads as the major source of Zn. Six groups of six weanling male rats each were fed on 5 parts semi-synthetic Zn-deficient diet and 1 part wheat-endosperm crispbread for 1 week. At the beginning of the second week, the crispbread in the diet of five groups was exchanged for crispbread made using one of the following wheat flours: (1) whole grain, (2) bran-enriched whole grain, (3) endosperm with Zn added to the whole-grain level, (4) endosperm with Zn added to the bran-enriched level, (5) whole grain with Zn added to the bran-enriched level. These diets were given ad lib. together with deionized water for 2.5 weeks. The relative absorption of Zn was lowest from the three non-supplemented diets (75–82%). All the added Zn was absorbed. As appetite, body-weight increase, Zn absorption, Zn retention and the Zn concentrations in serum and bone differed only slightly among groups fed on diets with similar Zn concentrations, it is concluded that factors such as dietary fibre or phytate in wheat bran limit the availability of Zn in wheat crispbreads very little when all the Zn is needed for growth and development in rats.

Keywords

Wheat branZinc availabilityZinc deficiencyRat
Type
Research Article
Information
British Journal of Nutrition , Volume 62 , Issue 1 , July 1989 , pp. 165 - 175
Copyright
Copyright © The Nutrition Society 1989

References

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