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可活化稳定同位素^(70)Zn示踪研究儿童膳食中锌的生物利用率 被引量:2

Study on Bioavailability of Zinc for Children's Diet by Using Activable Isotopic Tracer ^(70)Zn and Neutron Activation Analysis Techniques
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摘要 使用中子活化分析法 ,以国内仅有的低浓缩度70 Zn(18 3 % )作为可活化稳定浓缩同位素示踪剂 ,对我国儿童膳食中锌的生物利用率进行了研究。建立了以阴离子树脂交换法对儿童便样中的锌元素进行富集 ,经反应堆中子辐照、测量和放射化学分离、测定锌的生物利用率方法。提出了普适于各种70 Zn浓缩度锌作为示踪剂、以70 Zn和68Zn或64 Zn的质量丰度进行生物利用率的计算公式。 Bioavailability of zinc for three groups(low amount of diet zinc, balance amount of diet zinc and high amount of diet zinc) of children's diet is studied by using activable isotopic tracer 70Zn and neutron activation analysis techniques. The results indicate that the fractional absorption of zinc from balance diet zinc group is the highest, up to 33.9%. A procedure of pre-irradiation concentration zinc for fecal samples using anion exchanger is developed, and the enriched 70Zn with isotopic abundance of 18.3% is used for tracer. The mass ratios between 70Zn and 68Zn or 64Zn and their contents ability of zinc. Instrumental neutron activation analysis of between natural zinc and enriched zinc are used to calculate the bioavail 64Zn of each original fecal samples and pre-irradiation concentrated zinc samples are used to normalize the chemical yield in order to reduce the uncertainty during the chemical separation procedure.
出处 《原子能科学技术》 EI CAS CSCD 2001年第5期416-421,共6页 Atomic Energy Science and Technology
基金 国家自然科学基金资助项目 (19875 0 82 )
关键词 生物利用率 稳定同位素示踪 中子活化分析 锌70 营养 儿童膳食 Biomedical engineering Neutron activation analysis Nutrition Radioisotopes Zinc
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