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Journal of Nutrition Vol. 106 No. 7 July 1976, pp. 913-917
Copyright © 1976 by American Society for Nutrition
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Bioavailability of Zinc in Milk and Soy Protein-based Infant Formulas

Berislav Momcilovic1, Bartholomeus Belonje, Alexandre Giroux and Bhagwan G. Shah2

Nutrition Research, Food Directorate, Department of Health and Welfare, ,3 Ottawa, Canada, K1A OL2

Total femur zinc of young rats was used to evaluate the biological availability of zinc in milk and soy protein-based infant formulas. A zinc deficient diet (0.8 µg Zn/g) containing egg white protein was supplemented with graded levels of zinc from zinc sulfate, milk and soy protein-based infant formulas. A plot of total femur zinc (log) after feeding the diet for 3 weeks versus the zinc added to the diet gave a linear relationship over the range of 0, 3, 6, 9 and 12 µg/g added zinc. By using a slope-ratio bioassay model, the relative biological availability of endogenous and added zinc in milk-based formula was estimated to be 0.86 and that of soy-based formula 0.67 (zinc sulphate = 1.00) with corresponding 95% fiducial limits being 0.82 to 0.91 and 0.62 to 0.71. Thus, to provide equivalent amounts of available zinc, the total zinc content of the soy protein-based formula would need to be at least 20% higher than that of the formula containing milk protein.

KEY WORDS: • zinc availability • infant formulas • rat assay

1 Postdoctoral fellow of National Research Council Canada. Present address: Yugosiav Academy of Science and Arts. Institute for Medical Research (incorporating Institute for Industrial Hygiene). M. Pijade 158, 41000 Zagreb, Yugosiavia.

2 Reprint requests should be sent to Dr. B. G. Shah.

3 Publication No. 40.

Manuscript received 17 November 1975.




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