Methylmercury in the breast milk of Japanese mothers and lactational exposure of their infants
| Autor: | Hirokatsu Akagi, Miyuki Iwai-Shimada, Katsuyuki Murata, Nozomi Tatsuta, Kunihiko Nakai, Hiroshi Satoh |
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| Rok vydání: | 2015 |
| Předmět: |
chemistry.chemical_classification
Fetus medicine.medical_specialty Environmental Engineering Health Toxicology and Mutagenesis Public Health Environmental and Occupational Health food and beverages Infant exposure General Medicine General Chemistry Maternal blood Breast milk Pollution chemistry.chemical_compound fluids and secretions Endocrinology Animal science chemistry Lipid content Internal medicine medicine Environmental Chemistry Birth cohort Methylmercury Polyunsaturated fatty acid |
| Zdroj: | Chemosphere. 126:67-72 |
| ISSN: | 0045-6535 |
| DOI: | 10.1016/j.chemosphere.2014.12.086 |
| Popis: | The human fetus is known to be exposed to methylmercury (MeHg), but little is known about the risk of infant exposure via breast milk. To evaluate the lactational exposure to MeHg via breast milk in Japanese infants, the levels of total mercury (THg) and MeHg were determined in breast milk and maternal blood using samples from a birth cohort study at the Tohoku Study of Child Development. Maternal blood and breast milk were collected one day postpartum and one month after delivery, respectively. The median THg (and MeHg) concentrations in maternal RBCs, plasma and breast milk were 17.8 ng g(-1) (17.8 ng g(-1)), 1.51 ng g(-1) (1.33 ng g(-1)) and 0.81 ng g(-1) (0.45 ng g(-1)), respectively (n=27). The median percentage of MeHg in THg was 54% in breast milk. Breast milk contained substantial amounts of MeHg, which was strongly associated with the internal accumulation of MeHg and the lipid content of the milk (r=0.684). The range of lipid contents in milk varied widely from 0.50 to 6.60 g/100 g of milk, with a median of 3.60 g/100 g. The median (range) weekly average intake of MeHg via breast milk was estimated to be 0.63 μg kg(-1) (0.08-1.68 μg kg(-1)) BW/week. Because the MeHg and lipid contents in milk substantially fluctuate, an investigation of the variations of MeHg and lipid content in breast milk may be required for a more precise risk assessment. |
| Databáze: | OpenAIRE |
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