Bioavailability of silicon from food and food supplements |
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Authors: | K Van Dyck R Van Cauwenbergh Harry Robberecht Hendrik Deelstra |
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Institution: | (1) University of Antwerp (UIA), Department of Pharmaceutical Sciences, Laboratory of Food Sciences, Universiteitsplein 1, B-2610 Antwerp (Wilrijk), Belgium, BE |
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Abstract: | The bioavailability of silicon from three different silicon sources was studied. A diet rich in silicon, a tablet containing
a dry extract of horsetail and a solution of silicon in a choline-glycerol matrix were compared. Blood and urine of one healthy
test person were sampled to monitor the silicon uptake. The silicon content of blood and serum samples was determined by graphite
furnace atomic absorption spectrometry. Strongly diverging results were obtained for the three different silicon sources.
Neither an increase in urinary silicon excretion nor in serum silicon content was observed when feeding the silicon rich diet.
Urinary silicon excretion did significantly (P < 0.05) rise during supplementation with tablets containing dry extract of horsetail. Intake of a solution of silicon in
a choline-glycerol matrix resulted in a significantly (P < 0.05) increased urinary silicon excretion and serum silicon content. From these results it can be concluded that speciation
(chemical form, matrix) strongly influences the bioavailability of silicon.
Received: 3 August 1998 / Revised: 25 September 1998 / Accepted: 30 September 1998 |
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