Ehrenkranz R A, Ackerman B A, Nelli C M, Janghorbani M
Pediatr Res. 1985 Feb;19(2):178-84. doi: 10.1203/00006450-198502000-00006.
Absorption of dietary calcium was evaluated with the extrinsic tag approach and stable isotope methodology in growing premature infants. Fractional absorption of a bolus dose of 46Ca was determined on 16 occasions in 13 premature infants (birth weight 1135 +/- 40 g, gestational age 29.5 +/- 0.4 wk, mean +/- SE) and was found to be 84.4 +/- 2.2%. Fractional absorption of 46Ca ranged between 65 and 97%, and did not appear to be influenced by postnatal age, postconceptual age, body weight, or intake of preterm human milk, fortified preterm human milk, or premature formula. Therefore, if absorption of the 46Ca dose reflects that of dietary calcium, about 80% of dietary calcium is absorbed.
采用外源性标记法和稳定同位素方法，对生长中的早产儿膳食钙的吸收情况进行了评估。在13名早产儿（出生体重1135±40g，胎龄29.5±0.4周，均值±标准误）中，分16次测定了46Ca单次推注剂量的分数吸收，结果发现为84.4±2.2%。46Ca的分数吸收范围在65%至97%之间，似乎不受出生后年龄、孕龄、体重或早产儿母乳、强化早产儿母乳或早产儿配方奶摄入量的影响。因此，如果46Ca剂量的吸收反映了膳食钙的吸收情况，那么约80%的膳食钙可被吸收。
