儿童发中锌、钙元素含量随年龄变化的规律分析

背景:微量元素是人体中微量元素含量的重要指标,能够显示人体健康与营养状况的种种信息。因此进行有关儿童发中微量元素随年龄变化的规律及其相关性,合理调节儿童营养有十分重要意义。目的:通过大量随机的儿童发样中微量元素的含量的测量和统计,发现儿童发中微量元素锌、钙随年龄变化的规律,为研究和制定儿童发中微量元素的标准和合理地调节儿童营养提供了理论依据,具有很好的指导意义。设计:随机抽样调查研究。地点、对象和方法:选取廊坊市文安县6岁以下儿童的发样,样品经洗涤干燥,准确称量,干法灰化,用1∶1盐酸提取,用10g/LSrCl2溶液定容,选取仪器最优化条件,火焰原子吸收法测定。对测定结果进行统计分析,随机抽取1000多份年龄为几天至6岁儿童的发样测定结果分年龄段进行统计,取各个年龄段结果的平均值。主要观察指标:不同年龄对应的锌、钙含量比较。结果:发现新生儿(4个月以内)发中锌、钙的含量均较高,至6个月以后,其含量逐渐降低,到1.5～2.5岁左右处于一段低谷,到3岁以后锌、钙的含量又有所增高。如:2个月以内的儿童发中锌、钙的含量的平均值分别为:190,1432μg/g;18个月儿童发中锌、钙的含量的平均值分别为:115,412μg/g;72个月(6岁)儿童发中锌、钙的含量的平均值分别为:147,606μg/g。结论:学龄前

Analysis on rules of zinc and calcium content in children's hair as age changes

BACKGROUND: Microelement. An important index of the microelement content in hunan body, manifests various kinds of information on health and nutrition status. Therefore, research on the rules and correlations of microelenent content in children's hair as age changes, and on how to regulate clfild nutrition reasonably has quite a significant meaning.OBJECTIVE: To discover the rules of zinc and calcium content in children's hair as age changes through masses of random surveys and statistics for the content of microelement in children's hair samples. To provide theoretical evidence for the research on how to formulate the standard of microelement content in children's hair and regulate child nutrition reasonably.It is of great significance.DESIGN: Random sampling study.SETTING, PARTICIPANTS and INTERVENTIONS: Children below six years old in Wenan County of Langfang City, whose hair was selected as the sample. The sample was desiccated after washing, weighed accurately,then drying cineration was performed, after that, it was extracted by hydrochloric acid in one to one made up to, fixed volume with 1% SrCl2,measured by flame atom absorbing method with the instruments' most optimized situation. Estimation results of more than 1 000 hair samples were statistically analyzed, with the children aged from several days to six years old. The average value of different age stages were collected.MAIN OUTCOME MEASURES: Comparison of corresponding zinc and calcium content at different ages.RESULTS: Content of zinc and calcium in the newborn infants' hair (four months old) is higher. Six months later, the content reduced gradually and remained low at the age of 1.5 to 2.5 years, it increased after 3 years old.For instance: the average content of zinc and calcium in two-month-old children's hair is 190 and 1 432 tμg/g; 18-month-old children is 115 and 412 μg/g; seventy-month-old (6 years old) children is 147 and 606 μg/g respectively.CONCLUSION: Zinc and calcium content in preschool children's hair as age changes shows evident regularities.