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Excess calcium increases bone zinc concentration without affecting zinc absorption in rats

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Abstract

We examined zinc (Zn) metabolism in rats given diets containing excess calcium (Ca). Rats were given phytate-free diet containing 5 g Ca/kg (control), 12.5 g Ca/kg, or 25 g Ca/kg for 4 wk in Experiment 1. The dietary treatment did not affect Zn concentration in the plasma, testis, kidney, spleen and liver; however, Zn concentration in the femur and its cortex was significantly higher in rats given diet containing 25 g Ca/kg than in other rats. Rats were given phytate-free diet containing 5 g Ca /kg or 25 g Ca /kg for 4 wk in Experiment 2. After 12-h food deprivation, rats were given a diet extrinsically labeled by67Zn with dysprosium as a fecal marker for 4 h. Feces were collected from 1 d before administration of the labeled diet to 5 d after administration. Excess Ca did not affect the true absorption of Zn and its endogenous excretion but increased femoral Zn. These results suggest that excess Ca improves Zn bioavailability without affecting Zn absorption when diets do not contain phytate.

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  1. Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, 606-8502, Kyoto, Japan

    Satoshi Takasugi, Tohru Matsui, Hideyuki Omori & Hideo yano

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  1. Satoshi Takasugi
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Takasugi, S., Matsui, T., Omori, H. et al. Excess calcium increases bone zinc concentration without affecting zinc absorption in rats. Biol Trace Elem Res 116, 311–320 (2007). https://doi.org/10.1007/BF02698015

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  • DOI: https://doi.org/10.1007/BF02698015

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