Maternal-Fetal Distribution of Calcium,Iron, Copper,and Zinc in Pregnant Teenagers and Adults |
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Authors: | Milena Lima de Moraes Renata de Faria Barbosa Raquel Espírito Santo Flávia da Silva Santos Edgar Francisco Oliveira de Jesus Fátima Lúcia de Carvalho Sardinha Maria das Graças Tavares do Carmo |
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Institution: | 1.Laboratory of Biochemical Nutrition,Josué de Castro Institute of Nutrition, Federal University of Rio de Janeiro,Rio de Janeiro,Brazil;2.Laboratory of Nuclear Instrumentation, Technology Center,Federal University of Rio de Janeiro,Rio de Janeiro,Brazil;3.Institute of Physics,Rio de Janeiro State University,Rio de Janeiro,Brazil;4.Instituto de Nutri??o Josué de Castro (UFRJ), Laboratório de Bioquímica Nutricional,Rio de Janeiro,Brazil |
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Abstract: | Adolescence is marked by intensive growth and development. When pregnancy occurs during this period of the mother’s growth,
there is an increase in her nutritional needs. The aim of this study was to determine the levels of calcium, iron, copper,
and zinc in maternal plasma, the placenta, and in the cord plasma of pregnant teenagers and adults. A total of 80 sets of
maternal plasma, placentas, and cord plasma (40 from teenagers and 40 from adults) were analyzed using synchrotron radiation
total reflection X-ray fluorescence. The levels of calcium, copper, and zinc in the maternal and cord plasma from teenagers
were not significantly different than those from adults. Iron levels in the teenagers maternal and cord plasma were higher
than in the adults. All of the minerals analyzed were present at higher levels in the placentas from adults than those from
teenagers. However, the low quantities of placental calcium, iron, copper, and zinc in the teenagers do not compromise the
levels of these minerals in the cord plasma. Future research regarding the placental transport of these minerals is recommended
to investigate the efficiency of mechanisms of transfer of these minerals in pregnant teenagers. |
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