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Erythrocyte manganese concentration in healthy Japanese children, adults, and the elderly, and in cord blood.

This study showed differences in erythrocyte manganese concentrations in different age groups and in cord blood. All determinations were performed with a flameless atomic absorption spectrophotometer. The mean erythrocyte manganese concentration at one month of age was 435.1 +/- 118.7 ng/g Hb, three to four times higher than in adults. Thereafter, it decreased rapidly and was constant from 4 months to 11 yr of age. However, at 12 to 19 yr of age the concentration in males decreased (108.1 +/- 20.2 ng/g Hb) and was significantly lower than in females (141.7 +/- 25.5 ng/g Hb) (p less than 0.01). This sex difference became even greater in adults aged 20 to 40 yr, when it was 91.5 +/- 22.4 ng/g Hb in males and 141.2 +/- 19.8 ng/g Hb in females (p less than 0.001). The erythrocyte manganese concentration in adults was 31.6 +/- 9.2 ng/ml, somewhat higher than the value previously reported, which may reflect dietary habits in Japan or a racial difference.