Dorea J G, Horner M R, Campanate M L
Acta Paediatr Scand. 1985 Nov;74(6):891-6. doi: 10.1111/j.1651-2227.1985.tb10054.x.
The concentrations of zinc and copper were longitudinally studied during the first three months of self-determined lactation periods of nine Brazilian women. Both elements were studied in relation to volume, energy and total ash of milk. During the six bi-weekly intervals, zinc showed a significant difference between the high initial value (as mass/volume), mass/g of ash and mass/kcal) and later values toward the end of the third month, but no significant difference was observed for copper. With respect to all three of those parameters, regression analysis of zinc against length of lactation (six bi-weekly intervals) showed a significant and inverse correlation. Only when expressed as mass/g of ash was copper significantly and directly correlated with length of lactation. The data indicate that zinc secretion into human milk occurs independently of copper and mineral mass and also follows a previously identified physiological pattern.
对9名巴西女性自定哺乳期的前三个月进行了锌和铜浓度的纵向研究。研究了这两种元素与牛奶体积、能量和总灰分的关系。在六个双周间隔期间，锌在初始高值（以质量/体积、质量/克灰分和质量/千卡计）与第三个月末的后期值之间存在显著差异，但铜未观察到显著差异。关于所有这三个参数，锌与哺乳期长度（六个双周间隔）的回归分析显示出显著的负相关。只有当以质量/克灰分表示时，铜才与哺乳期长度显著正相关。数据表明，人乳中锌的分泌独立于铜和矿物质质量，并且也遵循先前确定的生理模式。
