Comparative Studies on the Composition of Korean Human and Cow's Milk (I) -Amino Acid Composition of Human and Cow's Milk of Korea-

한국인(韓國人) 모유(母乳)와 우유(牛乳)의 성분(成分) 조성(組成)에 관(關)한 비교(比較) 연구(硏究) (I) -한국인(韓國人) 모유(母乳)와 우유중(牛乳中)의 Amino산(酸) 조성(組成)에 관(關)한 연구(硏究)-

The amino acid composition of human and cow's milk represents a standard of reference in infantnutrition. The amino acid compositions determined by automatic amino acid analyzer, Yanagimote Model LC-5. Protein in the human and cow's milk were found to be hydrolyzed to yield free amino acids. Qualitative data for free amino acids in the milk are as follows: 1) Amounts of acidic amino acids such as glutamic and aspartic acid in cow's milk were obserbed to be about 2 times compared with human milk and it is considered that the abundance in these amino acids may contribute significantly to the specific flavor of cow's milk. 2) It is much interesting that in the human milk the contents of sulfur-containing amino acids were high comparatively better than cow's milk; cystine was found to be 3 times ana methionine, 2 times. 3) In the human milk a high content of some essential amino acids such as threonine, isoleucine and leucine was demonstrated and a specific flavor sweet amino acids. 4) Large amounts of basic amino acid such as histidine was found to occur in human milk and arginine in cow's milk.