Turnlund J R, Michel M C, Keyes W R, King J C, Margen S
Am J Clin Nutr. 1982 May;35(5):1033-40. doi: 10.1093/ajcn/35.5.1033.
The absorption of zinc and iron was determined in seven elderly men using the enriched stable isotopes 70Zn and 58Fe. Analyses of isotopic ratios were done using thermal ionization magnetic sector mass spectrometry on chloride solutions of zinc and of iron after separation of zinc from fecal samples by ion exchange and of iron by solvent extraction. Mean apparent zinc absorption in the seven subjects was 17.3 +/- 3.1% (mean +/- SEM) and mean iron absorption was 7.9 +/- 2.5% (mean +/- SEM) when fed a semipurified diet containing 15 mg of zinc and 10 mg of iron daily. Quantities absorbed were equivalent to an average of 2.6 mg of zinc and 0.8 mg of iron per day. These average zinc and iron values are close to previous estimates of endogenous losses of zinc and iron.
利用富集稳定同位素70Zn和58Fe测定了7名老年男性锌和铁的吸收情况。通过离子交换从粪便样本中分离锌、通过溶剂萃取分离铁后，采用热电离磁扇形质谱法对锌和铁的氯化物溶液进行同位素比率分析。当给这7名受试者喂食每日含15毫克锌和10毫克铁的半纯化饮食时，平均表观锌吸收率为17.3±3.1%（平均值±标准误），平均铁吸收率为7.9±2.5%（平均值±标准误）。吸收量相当于平均每天2.6毫克锌和0.8毫克铁。这些锌和铁的平均数值接近先前对锌和铁内源性损失的估计。
