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本文以5—7岁整托幼儿园12名缺锌儿童为实验对象,实验前其发锌平均含量为:73.5±19.0ppm 锌儿童随机分为三组:A、锌摄入量6.1mg/日、B、10mg/日和C38.1mg/日。应用稳定性同位素~(70)锌中子活化分析法对三种膳食锌摄入量儿童,作了锌吸收率分别为:29.6±16.7％、33.9±6.8％、和23.1±2.5％。结果说明:①在理想的平衡膳食条件下锌的吸收率最高;②强化硫酸锌达到一定量(C组)会降低锌的吸收率。本文还对应用稳定性同位素~(70)锌中子活化法测定人体膳食锌吸收率产生误差的条件进行了分析。
In this paper, 12 children aged from 5 to 7 years were enrolled in this study. The average zinc content before the experiment was 73.5 ± 19.0ppm. The children were randomly divided into three groups: A, zinc intake 6.1mg / B, 10 mg / day and C38.1 mg / day. The zinc absorption rates for three diets containing zinc were 29.6 ± 16.7%, 33.9 ± 6.8% and 23.1 ± 2.5%, respectively, for the stable zinc isotope assay. The results showed that: (1) zinc absorption rate was the highest under ideal balanced dietary conditions; (2) enhanced zinc sulfate reached a certain amount (group C), which would reduce zinc absorption rate. In this paper, the conditions for the determination of the human dietary zinc absorption rate using the stable isotope ~ (70) zinc neutron activation method were also analyzed.