Phytate × Calcium/Zinc Molar Ratios: Are They Predictive of Zinc Bioavailability? |
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| Authors: | ELIZABETH J. FORDYCE RICHARD M. FORBES KELLY R. ROBBINS JOHN W. ERDMAN JR. |
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| Affiliation: | Authors Fordyce and Erdman' are with the Dept. of Food Science, 567 Bevier Hall, 905 S. Goodwin Ave, Univ. of Illinois, Urbana, IL 61801. Author Forbes is with the Dept. of Animal Sciences, Univ. of Illinois, Urbana. Author Robbins is with the Dept. of Animal Science, Univ. of Tennessee, Knoxville, TN 37901. |
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| Abstract: | The utility of the phytate/zinc and phytate × calcium/zinc molar ratios for predicting zinc bioavailability from processed soybean foods was investigated. Weight gain and bone zinc accumulation in rats fed various soy protein products were plotted against the calculated molar ratios. The phytate × calcium/zinc ratio was a better predictor of zinc bioavailability in similarly processed products than was the phytate/ zinc ratio. However, in some cases the phytate × calcium/zinc ratio was not effective since some processing procedures apparently altered binding of phytic acid to minerals and other food components. |
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