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Open Access Research

Postprandial effects of calcium phosphate supplementation on plasma concentration-double-blind, placebo-controlled cross-over human study

Ulrike Trautvetter1, Michael Kiehntopf2 and Gerhard Jahreis1*

Author Affiliations

1 Department of Nutritional Physiology, Institute of Nutrition, Friedrich Schiller University of Jena, Dornburger Straße 24, Jena, D-07743, Germany

2 Institute of Clinical Chemistry and Laboratory Medicine, Jena University Hospital, Friedrich Schiller University Jena, Erlanger Allee 101, Jena, D-07747, Germany

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Nutrition Journal 2013, 12:30  doi:10.1186/1475-2891-12-30

Published: 8 March 2013

Abstract

Background

The aim of the present study was to examine the postprandial calcium and phosphate concentrations after supplementation with pentacalcium hydroxy-triphosphate (CaP).

Methods

Ten men participated in this double-blind, placebo-controlled, cross-over study. The participants were divided into two groups. One group consumed bread enriched with CaP (plus 1 g calcium/d) and the other group a placebo product for three weeks. After a two week wash-out, the intervention was switched between the groups for another three weeks. Blood samples were drawn at the beginning (single administration) and at the end (repeated administration) of the intervention periods at 0, 30, 60, 120, 180 and 240 min. Between 0 and 30 min, a test meal, with or without CaP was consumed. The plasma concentrations of calcium and phosphate were examined. One participant dropped out due to personal reasons.

Results

CaP supplementation resulted in a significantly higher plasma calcium concentration after 240 min compared to placebo. After repeated CaP administration, the AUC for the increment in plasma calcium concentration was significantly higher compared to placebo.

After single and repeated CaP supplementation, plasma phosphate concentration significantly decreased after 30, 60, 120 and 180 min compared to 0 min. The placebo administration resulted in significant decreases after 30, 60 and 120 min compared to 0 min.

Conclusion

Our results show that CaP contributes to an adequate calcium supply, but without increasing the plasma concentration of phosphate.

Trial registration

http://www.clinicaltrials.gov webcite; NCT01296997

Keywords:
Calcium phosphate; Plasma calcium; Plasma phosphate; Human study