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The Relationship between Zinc Concentration of Maternal, Umbilical Cord, and Placenta and Birth Weight
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Hyun Sook Bai, Hong Seok Ahn
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Korean J Community Nutr 2003;8(6):814-821. Published online December 31, 2003
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- The purpose of this study was to assess the maternal zinc status during pregnancy and to evaluate the relationship between the zinc concentration of maternal, umblical cord blood and placental tissue and pregnancy outcomes. Venous blood samples were drawn from 53 pregnant women just before delivery and the cord blood of their newborn babies was collected immediately after birth. In addition, placental tissues were extracted. We investigated the difference in the concentration of zinc in maternal, umbilical cord blood and placental tissue in two gestational age groups (preterm delivery group [PT] and normal term delivery group [NT]) at 34.7 wk and 39.0 wk of mean gestational age, respectively). We also assessed correlations of the zinc concentration of maternal, umbilical cord blood and placental tissue. Lastly, we studied the correlations between the birth weights and the zinc concentration in the maternal, umbilical cord blood and placental tissue. The concentrations of maternal serum zinc and of umbilical cord serum zinc were significantly higher in the PT group (76.9 +/- 37.4 microgram/dl, 101.3 +/- 41.4 microgram/dl) than in those of the NT group (57.8 +/- 22.4 microgram/dl, 80.7 +/- 27.5 microgram/dl), respectively (p < 0.05). The zinc concentration of the umbilical cord blood was significantly higher than that of the maternal blood in both groups (p < 0.05). There was no significant correlation between the gestational age and the serum zinc concentration in the cord or the maternal serum. Our results showed that there was a negative relationship between the birth weight (r = -0.286) and the maternal serum zinc concentration. Despite there not being a significant difference, there was tendency for the highest concentrations of maternal serum zinc to be associated with the lowest birth weights. These findings support a possible relationship between the maternal zinc status and the pregnancy outcome, and suggest that zinc may play a role in the many biological processes involved in the successful outcome of a pregnancy.
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A Comparative Sudy of the Lactose, Total Nitrogen, Total Lipid Content of Preform and Term Human Breast Milk
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Hong Seok Ahn, Hyun Sook Bai
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Korean J Community Nutr 2003;8(4):584-594. Published online August 31, 2003
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- The lactose, total nitrogen and total lipid contents of human breast milk were determined longitudinally after protein and term deliveries. Milk samples were obtained from day 2 to 5, on weeks 1, 2, 4, and 6 after preform (PM: n=24) and term (TM: n=22) deliveries. The lactose contents of PM and TM increased from 5.28 g/dl and 5.93 g/dl at days 2 to 5, to 7.95 g/dl,7.87 g/dl at 6 weeks, respectively. The total nitrogen contents of PM and TM decreased significantly during the first 6 weeks after birth (from 374 to 220 mg/dl versus 382 to 220 mg/dl respectively). However the total lipid contents of the PM and TM increased during the same periods. Significant differences in the total lipid contents between the PM and TM were 2.15 versus 3.27 g/dl at 2 weeks, and 3.26 versus 2.52 g/dl at 6 weeks, respectively. The energy intakes of preform infants was 134.8 kcal/kg/d during the 6 weeks of lactation, which satisfied with energy requirements (85-130 kcal/kg/d) of the preform infants.
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Iron Status Indices of Maternal, Umbilical Cord, Placenta and Birth Weight
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Hyun Sook Bai, Geum Ju Lee, Min Sook Lee, Ju Ye Lee, Yong Mi Shin, Hong Seok Ahn
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Korean J Community Nutr 2002;7(5):686-695. Published online October 31, 2002
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- The purpose of this study is to assess the maternal iron status during pregnancy and to evaluate the relationships between the iron indices of maternal, umbilical cord serum, placenta and pregnancy outcomes. Venous bloods samples were drawn from 54 pregnant women just before delivery and cord bloods of their newborn babies were collected immediately after birth. And also, placental tissues were extracted. We investigated the difference of the iron status indices of maternal, umbilical cord serum and placental tissue between two gestational age group (PT group, NT group : preterm delivery and normal term delivery at 34.9wk and 39.0wk of mean gestational length, respectively) and also assessed correlations of iron status indices of maternal, umbilical cord serum and placenta tissue. And lastly, we related between birth weight and iron status indices of maternal, umbilical cord serum and placental tissue. The concentrations of maternal serum ferritin and of placental iron were significantly higher in PT group (32.1 +/- 21.1 ng/ml, 68.5 +/- 16.7microgram / g), than those of NT group (20.8 +/- 11.6 ng / ml, 53.2 +/- 17.4 microgram / g) respectively (p < 0.001). However the serum ferritin of umbilical cord were significantly higher in NT group (PT : 109.4 +/- 65.7 ng/ml, NT : 147.0 +/- 56.8 ng / ml) than those of PT group (p < 0.05). Our results showed that a negative association between birth weight (r=-0.361) and maternal serum ferritin and that a positive association between birth weight and umbilical cord serum ferritin (r=0.261). Despite not a significant difference, there was tendency that highest concentration of maternal serum ferritin was associated with the lowest birth weight. These findings indicate that birth weight of newborn is dependent of multiple factors such as maternal iron status during pre-pregnancy, body size, general nutritional status. Although for women who enter pregnancy with low iron stores, enough intakes of iron during pregnancy could produce undesirable pregnancy outcome. Therefore we suggest for successful pregnancy outcome and delivery differential iron supplementation program will be carried out individual pregnant women on the basis of pre-pregnancy nutritional status.
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Serum Concentration of Major Minerals, Trace Elements, Lipids and Fatty Acids Composition Related to Whole Cow's Milk Feeding in Infancy & Young Childhood
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Hong Seok Ahn, hyun Sook Bai, Sung Hye Park, Eun jung Chung, Kyung Hwan Oh
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Korean J Community Nutr 1997;2(4):477-485. Published online October 31, 1997
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- This study was conducted to determine the effect of large amounts of whole cow's milk intake on serum levels of minerals and lipids. Subjects were normal infants who were brought to the pediatric hospital for vaccination at the age of 7-26 months after birth, living in Eumsung-Choongbuk area. The serum concentrations of the imnerals(calcium, phosphorus, magnesium, iron, zinc and copper), lipids and fatty acids composition were analyzed in 38 infants which consumed large amount of whole cow's milk(over 700ml/day). The results obtained are summarized as follows : 1) The mean levels of calcium, phosphorus and magnesium in the serum of the total subjects were 7.56+/-0.51mg/dl, 11.12+/-0.72mg/dl and 1.62+/-0.13mg/dl respectively. The serum concentrations of iron, zinc and copper in total subjects averaged 72.42+/-1.62 microgram/dl, 76.29+/-3. 62 microgram/dl and 86.44+/-2.98 microgram/dl respectively. 2) The mean serum concentrations of triglyceride, total cholesterol, HDL and LDL in the total number of subjects were 96.84+/-9.22mg/dl, 133.45+/-6.30mg/dl, 32.79+/-1.77mg/dl and 81.29+/-4.81mg/dl respectively. 3) The average percentages of SFA, MUFA and PUFA inth total serum fatty acids were 38.98+/-2.42%, 25.82+/-0.98% and 37.30+/-1.09% respectively and the mean omega6/omega3 fatty acids ratio was 13.48. In general, the levels of serum minerals and omega3 fatty acid composition in the subjects of this study, who were whole cow's milk fed infants were lower than those reported in breast milk or formula fed infants. Therefore, the intake of large amount of whole cow's milk in the weani ng period should be controlled and adequate for the infant's nutritional status.
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