Abstract
The protein-protein and protein-lipid interactions in 3 commercial powdered infant formulae were compared to raw and pasteurized milk samples. Centrifugation of the infant formulae and milk samples for 2 hr at 4°C gave 3 distinct fractions: fat, serum, and pellet. The objective of this study was to determine the mineral distribution (i.e., Ca, P, Mg, K, Na, Zn, and Fe) among the fat, serum and pellet fractions obtained by centrifugation. Recoveries of individual minerals from the 3 fractions exceeded 90% in all cases. Ca in the fat fraction of infant formulae ranged from 17.5% to 32%, where as only 1.4% and 1.7% of the total Ca was recovered in the fat fraction of the raw milk and the pasteurized milk samples. P, Zn, Mg, and Fe followed similar patterns with respect to the fat fraction. In contrast, 80 to 90% of the K and Na were found in the serum fraction of the infant formulae and milk samples.
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