Zinc, Iron and Copper Availability as Affected by Orthophosphates, Polyphosphates and Calcium

Authors

  • MICHAEL B. ZEMEL,

    1. Authors Zemel and Bidari are affiliated with the Food Science & Human Nutrition Division, Dept. of Family & Consumer Resources, Wayne State Univ., Detroit, MI 48202.
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  • MOLOOK T. BIDARI

    1. Authors Zemel and Bidari are affiliated with the Food Science & Human Nutrition Division, Dept. of Family & Consumer Resources, Wayne State Univ., Detroit, MI 48202.
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ABSTRACT

Male weanling tats were fed an adequate diet supplemented with 0.42% P from either hexametaphosphate or orthophosphate, each at two levels of Ca intake (0.53% or 1.06%). Polyphosphates represented 13% of the total fecal phosphorus at the 0.53% Ca intake; this fraction was increased to 27% at the 1.06% Ca intake. Hexametaphosphate caused a 15% increase in fecal iron, a 12% decrease in liver iron and a 15% decrease in fecal zinc losses. These effects were markedly enhanced by supplemental Ca. Orthophosphate was without effect at the 0.53% Ca intake, but caused an 11% increase in fecal zinc losses at the 1.06% Ca intake.

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