北京市城乡乳母营养状况、乳成分、乳量、及婴儿生长发育关系的研究 Ⅳ.母乳中蛋白质及氨基酸含量

本文报道了北京城区、近郊、远郊及江西某农村91名分娩后1～6个月乳母乳汁中蛋白质及氯基酸含量。结果表明:(1)江西农村乳母每日摄入的蛋白质量远低于北京地区乳母,其乳汁中含氮量亦较北京地区母乳的为低,但氨基酸总量(18种氨基酸之和)则无显著差异。(2)据氨基酸总量得到的每100g母乳中真正蛋白质含量在四个调查点分别为0.98,1.04,1.01和0.96g。(3)母乳蛋白质中多数氨基酸含量在四个调查点无显著差异。江西乳母乳汁中酪、赖及异亮氨酸含量较低。(4)婴儿自出生三个月后,每日从母乳中获得的必需氨基酸量,除组与色氨酸外,均达不到我国暂用的婴儿氨基酸需要量标准,但婴儿体重正常。因此,该标准是否过高值得考虑。

STUDIES OF THE RELATION BETWEEN THE NUTRITIONAL STATUS OF LACTATING MOTHERS AND MILK COMPOSITIONS AS WELL AS THE MILK INTAKE AND GROWTH OF THEIR INFANTS IN BEIJING Ⅳ. The Protein and Amino Acid Content of Breast Milk

Breast milk from lactating mothers in urban, suburban, rural areas of Beijing and in a village of Jiangxi province was collected at 1-6 months post partum and analyzed for total nitrogen and 18 amino acids. The protein intake of Jiangxi mothers was much lower than that of mothers in the 3 areas of Beijing. The total nitrogen content of milk of the former showed significantly lower values, but there were no significant differences in the total amount of 18 amino acids in milk among the 4 groups. The true protein contents of mature milk in the 4 groups, determined by amino acid analysis, were 0.98, 1.04, 1.01, and 0.96% respectively which were lower than the value calculated from total nitrogen determination.The high non-protein nitrogen in human milk led to overestimate the protein content of breast milk by the latter method. There was no significant difference in the content of most amino acids in milk among the 4 groups. Only tyrosine, lysine and isoleucine content in the milk of Jiangxi mothers were lower than that of Beijing mothers.