山东农村典型膳食儿童人体锌吸收率研究

崔晞; 孙晶; 蔺新英; 赵长峰; 刘振军; 徐贵法

doi:10.11847/zgggws2005-21-07-12

山东农村典型膳食儿童人体锌吸收率研究

Study on zinc fractional absorption in routine diets for children in Shandong rural region

摘要

摘要:
目的研究山东农村典型膳食锌(Zn)在农村儿童人体吸收率及Zn吸收相关营养素的日摄入量。
方法受试者为4~6岁身体健康的农村儿童。标记稳定性同位素⁶⁷Zn3.0mg, 晚餐前一次经口给予, 采用原子吸收法(AAS)和热电离质谱(TIMS)分别检测膳食和粪便中总锌含量与⁶⁷Zn/⁶⁸Zn比值, 计算锌的吸收率, 并对膳食铁、钙、脂肪、蛋白、植酸、纤维素和维生素C(VC)含量测定, 将结果与我国儿童日推荐膳食营养素摄入量(RNIs)比较。
结果锌的吸收率为(12.94±3.32)%, 锌的平均日摄入量为11.16mg, 占RNI的96.7%, 蛋白质和抗坏血酸的日摄入量分别为31.2g与13.3mg, 占RNI的62.4%和19.0%。
结论在目前山东农村的膳食模式下, 儿童体内锌的吸收率偏低, 蛋白质和抗坏血酸的日摄入量不足。

Abstract:
Objective To study zinc fractional absorption in routine diets for children in Shandong rural region and the nutrients correlated with it.
Methods The volunteers, aged 4~6 years, were recruited from rural region in Shandong.Stable Isotope ⁶⁷ Zn 3.0 mg was administered to volnteers before supper orally.Zinc content in diets and feces and ⁶⁷ Zn/⁶⁸ Zn in feces were determined by Atomic Absorption Spectroscopy(AAS), and Thermal Ionization Mass Spectrometer(TIMS)to calculate zinc fractional absorption.Meanwhile, the daily intakes of iron, calcium, fat, protein, phytic acid, fibre, and Vitamin C(VC) were determined, and the results were compared with Chinese Reference Nutrient Intakes(RNIs)for children.
Results The zinc fractional absor ption was(12.94±3.32)%, and the daily intake of zinc was 11.16 mg that was 96.7% of RNI.The intakes of protein and VCwere 31.2 g and 13.3 mg respectively, being 62.4% and 19.0% of RNIs.
Conclusion Under the rout ine dietary model of Shandong rural region, the zinc fractional absorption is low.Furthermore, the daily intakes of protein and vitamin Care insufficient.

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