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Assessment of zinc bioavailability: studies in rats on zinc absorption from wheat using radio- and stable isotopes

Published online by Cambridge University Press:  09 March 2007

Thomas E. Fox ,
Susan J. Fairweather-Tait ,
John Eagles  and
S. Gabrielle Wharf
Thomas E. Fox
Affiliation:
AFRC Institute of Food Research, Norwich Laboratory, Norwich Research Park, Colney, NorwichNR4 7UA
Susan J. Fairweather-Tait
Affiliation:
AFRC Institute of Food Research, Norwich Laboratory, Norwich Research Park, Colney, NorwichNR4 7UA
John Eagles
Affiliation:
AFRC Institute of Food Research, Norwich Laboratory, Norwich Research Park, Colney, NorwichNR4 7UA
S. Gabrielle Wharf
Affiliation:
AFRC Institute of Food Research, Norwich Laboratory, Norwich Research Park, Colney, NorwichNR4 7UA
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Abstract

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Absorption from wheat intrinsically and extrinsically labelled with 67Zn and extrinsically labelled with 65Zn was measured from 67Zn faecal excretion and 6sZn whole-body retention in rats. There were significant differences between the extrinsically- and intrinsically-labelled 67Zn (P < 0·001), but not between the extrinsically-labelled 65Zn and intrinsically-labelled 67Zn. The effect of chicken meat on the absorption of Zn from intrinsically-labelled wheat was also studied in the rat. Mean Zn absorption from wheat and chicken meat fed separately was 18·5 and 68·2% respectively, and from a mixture of the two containing the same level of Zn was 50·1%. The apparent absorption of Zn from the composite meal was significantly higher than predicted from the results of the foods on their own (P < 0·001).

Keywords

ZincAbsorptionStable isotopes
Type
Zinc bioavailability
Information
British Journal of Nutrition , Volume 71 , Issue 1 , January 1994 , pp. 95 - 101
Copyright
Copyright © The Nutrition Society 1994

References

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