Universidad de Córdoba BIODISPONIBILIDAD MINERAL DE ...

Biodisponibilidad mineral de menús escolares
necessary to o into the study of all those factors that improve its availability. In
this sense, certain components of milk and infant formulas such as lactose,
glucose polymers, and caseinephosphopeptides may improve zinc absorption
and, in the case of caseinephosphopeptides, diminish interactions with other
mineral elements as well. This positive effect of caseinephosphopeptides could
be attributed to an increase in zinc solubility when it is bound to phosphoserine
residues or to zinc-caseinephosphopeptide complex that is absorbed by a
pathway different as the free ion from which there is no interaction with other
divalent cations at brush border membrane level. A positive effect has also
been observed on zinc absorption to low intakes of some kind of fiber; as a
consequence this element is bound by uronic acid residues, keeping it soluble
in lumen intestinal. This effect is not observed for high intakes of fiber, from
which it is necessary future investigations that clarify wheter the traditional
negative effect of fiber on mineral absorption is due itself to fiber fractions or to
some impurities in fiber materials such as phytic acid. Formulation foods with
compounds that improve zinc availability must be accompanied by an
appropriate manufacture that reduces the negative effect of some thermal
treatments and of fortification with salts, which not only increases availability,
but rather are also soluble and do not modify sensorial food characteristics.
Acknowledgements
Research work was funded by Andalusian Regional Government,
Department of Education and Science, group PAI AGR-170
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