Effect of positional distribution on the absorption of the fatty acids of human milk and infant formulas.
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The paper describes protein hydrolysates methods of hydrolysis, classification of hydrolysates based on the type of hydrolysed protein and extent of hydrolysis, conditions which should be fulfilled to ensure the hypoallergenicity (hypoantigenicity) of hydrolysed formulae. The indications for use in treatment and prevention are discussed.
Assessment of potential aluminum loading from regular ingestion of a commercial infant formula (Similac PM 60/40), as the only milk substitute, was made in 14 infants aged 9.6 +/- 4.4 months who were also undergoing continuous cycling peritoneal dialysis. Tissue aluminum accumulation was assessed by serial measurements of plasma aluminum levels, from the increment in plasma aluminum after a standardized deferoxamine infusion, and from quantitative histomorphometry of bone and measurements of total bone aluminum content. Initial mean plasma aluminum levels were 0.61 +/- 0.32 mumol/L, (normal 0.30 +/- 0.04 mumol/L), and values were less than 0.92 mumol/L during the follow-up of 20 +/- 8 months. Plasma aluminum levels increased from 0.59 +/- 0.18 to 0.88 +/- 0.22 mumol/L after a single dose of deferoxamine. The histochemical stain for bone aluminum was negative for all patients, and the bone aluminum content was 0.27 +/- 0.22 mmol/kg dry weight (normal 0.08 +/- 0.04 mmol/kg dry weight). Thus the infant formula Similac PM 60/40 can be safely used in infants with chronic renal failure.
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The 18 trace elements Ba, Be, Bi, Cd, Co, Cs, Cu, La, Li, Mn, Mo, Pb, Rb, Sb, Sn, Sr, Tl, and Zn were determined in three extensively hydrolysed formulae by inductively coupled plasma mass spectrometry. Two formulae were whey hydrolysates, whereas one was based on soy-bovine collagen hydrolysate. Two skim milk powder reference materials, analyzed to ensure the analytical precision and accuracy of the applied procedure, showed good agreement with the certified values. Most of the elemental concentrations in this three formulae 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 the other two formulae. As regards Rb, all three formulae had distinctly lower concentrations than the four pre- and nine follow-up formulae investigated in a previous study. For the essential trace element Sn, much higher concentrations were found in the three extensively hydrolysed formulae ( approximately 8 microg/kg) when compared to pre- and follow-up formulae (most of them <0.44 microg/kg). The concentrations of the toxic trace elements Cd, Pb, Sb, and Tl in extensively hydrolysed formulae did not exceed the concentrations 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 are guaranteed by the use of most formulae, whereas only one hydrolysed formula fulfilled these requirements for manganese. Two hydrolysed formulae provide only approximately 50% of the recommended intakes for Mo.
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