论文部分内容阅读
锌是具有广泛生理功能的微量元素之一,也是人体必不可少的营养物质。人体内锌的含量约占体重的0.002～0.004%,总含量约为2～4g。锌口服后15分钟被吸收,经十二指肠及近侧小肠吸收人血,2～4小时达高峰,以后渐降。锌的排泄主要经过胃肠道,其次为汗腺,肾脏排出很少。人体正常每日需锌量因年龄而异:初生～6个月3mg;6～12月5mg;1～10岁10mg;10～13岁13mg;15岁以上可按成人量供给15mg;妊娠妇女25mg;哺乳期妇女30～40mg。据我国20个省市的抽样分析,发现将近40%的儿童发锌含量处于低水平。北京抽样调查一般幼儿园的儿童每天从食物中摄取的锌为4.8～5mg,仅相当于幼儿正常摄取量(10mg)的一半左右。提示我国有相当比例的儿童处于边缘性缺锌状态。因此,缺锌、补锌问题值得引起广泛重视。
Zinc is one of the trace elements with a wide range of physiological functions and is also an essential nutrient in the body. The body of zinc content of about 0.002 to 0.004% of body weight, the total content of about 2 ~ 4g. After 15 minutes of zinc oral absorption, by the duodenum and proximal intestinal absorption of human blood, 2 to 4 hours to reach the peak, after the decline. Zinc excretion mainly through the gastrointestinal tract, followed by sweat glands, kidneys rarely excreted. The amount of zinc required for normal human daily changes varies with age: 3 mg at birth for 6 months, 5 mg at 6-12 months, 10 mg at 1-10 years, 13 mg at 10-13 years, 15 mg at 15 years of age, 25 mg at pregnant women, ; Lactating women 30 ~ 40mg. According to the sample analysis of 20 provinces and cities in our country, it is found that nearly 40% of children develop zinc levels at a low level. Beijing sample survey of children in general kindergarten daily intake of zinc from food is 4.8 ~ 5mg, equivalent to only about half the normal intake of young children (10mg). Prompted a considerable proportion of children in our country are marginal zinc deficiency. Therefore, lack of zinc, zinc issues deserved widespread attention.