title: [Evaluation of nutrient level and its factors of breast milk in Shenzhen City].
abstract: OBJECTIVE
  To investigate the nutrient level for Fat and Nutrient Elements (Ca, K, Na, Mg, Fe and Zn) in Breast Milk and its factors in Shenzhen, China. Eventually we can evaluate the nutrient study for local infants and provide a more reasonable basis for infants breast-feeding.
  
  
  METHODS
  235 breast milk (1 - 2 months postpartum) samples were collected in three districts of Shenzhen during the year of 2011 to 2013. Fat content was analyzed by Soxlet Extraction System, and elements contents were determined by ICP - OES.
  
  
  RESULTS
  The average content of fat was 3.73 g/100 ml. The average concentrations of Ca, K, Na, Mg, Fe and Zn in breast milk from Shenzhen were 296.55, 531.45, 188.96, 28.22, 0.27 and 2.36 mg/L, respectively.
  
  
  CONCLUSIONS
  The average contents of fat and elements of Ca, K in the breast milk from Shenzhen were within the reference ranges provided by the World Health Organization (WHO). However, the levels for element of Fe and Mg were much lower than the reference ranges, and the levels for Na and Zn were relative higher when compared with the standard. No significant difference in six nutrients among three districts in Shenzhen were found, however, the significant difference in each element was found compared with that from other cities or countries. Furthermore Zinc daily intake for local infant reached the level of recommended nutrient intake (RNI), however other nutrients were under the adequate intake level (AI) which was set by Chinese nutrition society (CNS).
authors.forename: Ruiyuan
authors.initials: R
authors.lastname: Li
authors.forename: Chen
authors.initials: C
authors.lastname: Qi
authors.forename: Jie
authors.initials: J
authors.lastname: Jiang
authors.forename: Huimin
authors.initials: H
authors.lastname: Zhang
authors.forename: Shengnong
authors.initials: S
authors.lastname: Li
authors.forename: Kai
authors.initials: K
authors.lastname: Lin
authors.forename: Yousheng
authors.initials: Y
authors.lastname: Jiang
authors.forename: Jian
authors.initials: J
authors.lastname: Zhou
authors.forename: Xiaoshi
authors.initials: X
authors.lastname: Lin
authors.forename: Jianqing
authors.initials: J
authors.lastname: Zhang
mesh_terms: D001942:Breast Feeding; D002681:China; D002947:Cities; D005260:Female; D006801:Humans; D007223:Infant; D007227:Infant Nutritional Physiological Phenomena; D008895:Milk, Human / Q000737:chemistry*; D009751:Nutritional Requirements; D009752:Nutritional Status; D049590:Postpartum Period