Dorea J G
Department of Nutrition, University of Brazil, Brasilia, DF.
Ann Trop Paediatr. 1992;12(1):7-11. doi: 10.1080/02724936.1992.11747540.
The concentration of zinc and copper and metallocalorie ratios were measured in samples of bottle-milks fed to infants from a poor urban settlement in Brasilia, Brazil. The bottle-milks fed to infants under 1 year of age from a sample of 40 families were analysed for zinc and copper. Zinc and copper concentrations ranged from 0.7 to 11.5 mg/l (mean 3.37) and from 0.09 to 1.47 mg/l (mean 0.43), respectively. The mean metallocalorie ratio was 1.26 mg/MJ (5.29 mg/1000 kcal) for zinc and 0.17 mg/MJ (0.73 mg/1000 kcal) for copper. Based on minimum recommendations for formulae, 55% of the bottle-milks had both zinc and copper concentrations below 3.2 and 0.4 mg/l, respectively. However, owing to added sugar and high caloric concentrations in the milk preparations, metal:calorie ratios were below the minimum recommendations in 72.5 and 62.5% of cases for zinc and copper, respectively. The variation in zinc and copper concentrations in the milks prepared by mothers/infant caretakers under unsupervized home conditions is wide. Owing to the low availability of zinc in cow's milk preparations, it is of concern that more than half the bottle preparations had zinc and copper concentrations/ratios below the minimum recommendations.
对巴西巴西利亚一个贫困城市社区中喂养婴儿的瓶装奶样本进行了锌、铜浓度及金属热量比的测定。对来自40个家庭样本中1岁以下婴儿食用的瓶装奶进行了锌和铜含量分析。锌浓度范围为0.7至11.5毫克/升（平均3.37毫克/升），铜浓度范围为0.09至1.47毫克/升（平均0.43毫克/升）。锌的平均金属热量比为1.26毫克/兆焦（5.29毫克/1000千卡），铜为0.17毫克/兆焦（0.73毫克/1000千卡）。根据配方奶粉的最低推荐量，55%的瓶装奶锌和铜浓度分别低于3.2毫克/升和0.4毫克/升。然而，由于奶制品中添加了糖且热量浓度高，锌和铜的金属热量比分别在72.5%和62.5%的情况下低于最低推荐量。母亲/婴儿护理人员在无监督的家庭条件下制备的奶中锌和铜浓度差异很大。由于牛奶制品中锌的生物利用率低，超过一半的瓶装奶锌和铜浓度/比例低于最低推荐量，这令人担忧。
