Bosscher, Donwina;
Lu, Zhengli;
Janssens, Geert;
Van Caillie-Bertrand, Micheline;
Robberecht, Harry;
Rycke, Herman De;
De Wilde, Roland;
Deelstra, Hendrik
In vitroavailability of zinc from infant foods with increasing phytic acid contents
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Medientyp:
E-Artikel
Titel:
In vitroavailability of zinc from infant foods with increasing phytic acid contents
Beteiligte:
Bosscher, Donwina;
Lu, Zhengli;
Janssens, Geert;
Van Caillie-Bertrand, Micheline;
Robberecht, Harry;
Rycke, Herman De;
De Wilde, Roland;
Deelstra, Hendrik
Erschienen:
Cambridge University Press (CUP), 2001
Beschreibung:
<jats:p>An<jats:italic>in vitro</jats:italic>method was used to determine the availability of Zn from infant foods containing increasing amounts of phytate, and to quantify the effect of the phytate:Zn molar ratio on the availability. During the<jats:italic>in vitro</jats:italic>assay, digestive conditions of infants, younger and older than 4 months of age, were carefully simulated since the solubility of phytate–Zn complexes during digestion is pH dependent. Availability was measured with a continuous flow dialysis<jats:italic>in vitro</jats:italic>procedure with previous intralumen digestive stage. Zn concentrations were determined with flame atomic absorption spectrometry. Phytic acid content was measured with HPLC. Adding phytate to infant formula lowered Zn availability to 2·84 (SD 0·17) % WHEN THE PHYTATE:ZN MOLAR RATIO INCREASED TO 2·2 (P<0·05), AS COMPARED WITH COWS' MILK-BASED FORMULA (6·65 (sd 0·55) %). Availability from vegetables (23·83 (sd 2·17) %) significantly decreased (P<0·05) at a ratio > 7·9 (15·12 (sd 1·63) %). Zn availability from soyabean-based formula (2·26 (sd 0·36) %) was lower (P<0·05) compared with cows' milk-based formula (6·65 (sd 0·55) %). Availability between soyabean- and cows' milk-based formula was similar (P>0·05) when a phytate:Zn ratio of 2·2 (2·84 (sd 0·17) %) was obtained in the cows' milk formula. The negative effect of phytic acid on Zn availability was dependent on the type of the food and the phytate content, and should be considered when using soyabean-based formulas during early infancy.</jats:p>