Concentrations of trace elements in extensively hydrolysed infant formulaeand their estimated daily intakes

The 18 trace elements Ba, Be, Bi, Cd, Co, Cs, Cu, La, Li, Mn, Mo, Pb, Rb, S b, Sn, Sr, Tl, and Zn were determined in three extensively hydrolysed formu lae by inductively coupled plasma mass spectrometry. Two formulae were whey hydrolysates, whereas one was based on soy-bovine collagen hydrolysate. Tw o skim milk powder reference materials, analyzed to ensure the analytical p recision and accuracy of the applied procedure, showed good agreement with the certified values. Most of the elemental concentrations in this three fo rmulae were comparable to each other. However, concentrations of Cs in one formula were approximately 20 times higher than in the other two formulae. Another formulae had much higher concentrations of La and Mn compared to th e other two formulae. As regards Rb, all three formulae had distinctly lowe r concentrations than the four pre- and nine follow-up formulae investigate d in a previous study. For the essential trace element Sn, much higher conc entrations were found in the three extensively hydrolysed formulae (approxi mate to 8 mu g/kg) when compared to pre- and follow-up formulae (most of th em <0.44 mu g/kg). The concentrations of the toxic trace elements Cd, Pb, S b, and Tl in extensively hydrolysed formulae did not exceed the concentrati ons in cow-milk-based formulae. Daily intakes provided by the investigated formulae differ by a factor of 1.6 for Co, of 3.2 for Cu, of 8.7 for Mn, of 4.8 for Mo, and of 1.5 for Zn. Adequate daily intakes for Cu, Mo, and Zn a re guaranteed by the use of most formulae, whereas only one hydrolysed form ula fulfilled these requirements for manganese. Two hydrolysed formulae pro vide only approximately 50% of the recommended intakes for Mo. Copyright (C ) 2000 S. Karger AG, Basel.