安定同位体58Feによる鉄吸収率の測定

概要

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Five female college students were given cansecutively four types of test diet containing graded levels of protein and dietary fiber for 20 days (5 days for each dietary period). At the second and the third day of each dietary period the subjects were given orally the stable isotope 58Fe, 344μg, with each meal for six consecutive meals. Complete fecal collections were made during the entire study. Aliquot of the sample were analyzed for total iron content by atomic absorption spectrometry and for 58Fe using neutron activation analysis. Absorption of administered 58Fe label was calculated from the oral dose of the lable and the total 58Fe content of the fecal pool from marker to marker, given at breakfast an the first days of each dietary period and on the day after the experimental period. 58Fe absorption differed markedly by individuals and also by meals from 1.6 to 71%. When the subjects were fed a habitual Japanese diet, 58Fe absorption r nged from 22 to 41%. However, in the high-fiber diet containing the same amount of meat, fish and ascorbic acid but brown rice instead of polished rice, 58Fe absorption markedly decreased in all subjects.
社団法人日本栄養・食糧学会の論文