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    Infant formula iron dialysability related to other nutrients
    (Elsevier B.V., 2005-05-01) Nogueira, Cristiane de Souza [UNIFESP]; Colli, Celia; Amancio, Olga Maria Silverio; Universidade Federal de São Paulo (UNIFESP); Universidade de São Paulo (USP)
    The dialysable iron in relation to total iron, to protein sources, to calcium, magnesium, copper, zinc, and vitamin C of 17 infant formulas, from four different multinational companies were analyzed. Total iron, calcium, magnesium, copper, and zinc were determined by atomic absorption spectrophotometry. the dialysable iron was determined. the considered vitamin C concentration was that declared on the labels. There was no significant statistical relationship between total iron and dialysable iron (P = 0.54, r = 0.09) when considered separately. When analyzed considering protein sources, this relationship was shown to be inversely proportional to protein hydrolysate (P = 0.03, r = -0.72), and soy protein (P = 0.02, r = -0.93). the percentage of dialysable iron was significantly greater from the protein hydrolysate (P < 0.01). the dialysable iron showed a negative correlation with calcium (P < 0.05, r = -0.61). in conclusion, the infant formulas whose protein sources are casein and casein plus whey protein should present Ca:Fe and Fe:vitamin C ratios that allow considerable iron dialysability. (C) 2004 Elsevier B.V. All rights reserved.