Changes in element concentration and distribution in breast-milk fractions of a healthy lactating mother |
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Authors: | Kazuo T Suzuki Hiroko Tamagawa Seishiro Hirano Etsuko Kobayashi Kuniko Takahashi Nobuhiro Shimojo |
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Institution: | (1) National Institute for Environmental Studies, Onogawa, 305 Tsukuba, Ibaraki, Japan;(2) Institute of Environmental Sciences, University of Tsukuba, Tennodai, 305 Tsukuba, Ibaraki, Japan;(3) Department of Education, Gunma University, Aramaki, 371 Maebashi, Gunma, Japan |
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Abstract: | Daily changes in components of breast milk with number of days of lactation after delivery were demonstrated by determining
concentrations and distributions of several elements simultaneously. Concentrations of calcium, copper, magnesium, phosphorus,
sulfur, and zinc were determined simultaneously by inductively coupled argon plasma-atomic-emission spectrometry (ICP) for
whole milk and milk fractions (skimmed milk and whey) collected from 2 to 196 d postpartum from a healthy lactating mother.
Calcium and phosphorus concentrations increased in transitional milk. With days postpartum, the other elements decreased from
the highest concentrations in colostrum milk, the modes of decrease being characteristic for each element. Distributions of
copper, iron, phosphorus, sulfur, and zinc in whey were determined on a gel-filtration column by HPLC with ICP detection (HPLC-ICP
method). Distributions of the five elements and absorbance peaks at 254 and 280 nm changed dramatically day by day at the
beginning (colostrum milk), resulting in constant distributions after 30 d (mature milk). These results suggest the important
roles of daily changing constituents in breast milk, especially in colostrum milk, in the nutrition of the newborn. Several
element peaks on a gelfiltration column were identified by comparison with standard samples. |
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Keywords: | Breast milk element distribution copper zinc sulfur HPLC-ICP |
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