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Selenium absorption and retention from a selenite- or selenate-fortified milk-based formula in men measured by a stable-isotope technique

Published online by Cambridge University Press:  09 March 2007

Peter Van Dael ,
Lena Davidsson ,
Rafael Muñoz-Box ,
Laurent B. Fay  and
Denis Barclay
Rafael Muñoz-Box
Affiliation:
Nestlé Research Centre, PO Box 44, Vers-chez-les-Blanc, CH-1000 Lausanne, Switzerland
Laurent B. Fay
Affiliation:
Nestlé Research Centre, PO Box 44, Vers-chez-les-Blanc, CH-1000 Lausanne, Switzerland
Denis Barclay
Affiliation:
Nestlé Research Centre, PO Box 44, Vers-chez-les-Blanc, CH-1000 Lausanne, Switzerland
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Abstract

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The present study was designed to determine the apparent absorption and retention of the inorganic Se compounds SeO32- and SeO42-, which are commonly used for Se fortification of clinical nutrition products and infant formulas. Ten healthy men were fed a milk-based formula labelled with 40 μg Se as 74SeO32- or 76SeO42- on two consecutive days using a randomised crossover design. Se stable-isotope analysis of 9 d complete collections of urine and faeces was used to calculate apparent Se absorption and retention. Se retention from 74SeO32- (41·0 (SD 8·4) %) AND FROM 76SEO42- (46·0 (sd 7·9) %) was not significantly different (P>0·05). However, Se absorption was significantly higher from SeO42- than from SeO32- (91·3 (sd 1·4) % v. 50·2 (sd 7·8) %, P<0·05). Urinary excretion of the administered dose was 9·2 (sd 1·8) % for 74SeO32- and 45y3 (sd 8·2) % for 76SeO42- (P<0·05). Urinary Se excretion kinetics differed significantly for the two Se compounds; 90 % of the total urinary Se was excreted after 121 h for 74SeO32- and after 40 h for 76SeO42- (P<0·05). These results suggest that although Se absorption and urinary excretion differ for SeO32- and SeO42-, both Se compounds are equally well retained when administered at a relatively low dose (40 μg Se). The nutritional impact of Se fortification of foods would thus be expected to be similar when SeO42- or SeO32- are used.

Keywords

Selenium fortificationSelenium absorptionSelenium retentionInorganic selenium compoundsStable isotopes
Type
Research Article
Information
British Journal of Nutrition , Volume 85 , Issue 2 , February 2001 , pp. 157 - 163
Copyright
Copyright © The Nutrition Society 2001

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