PMID: 7333694Jan 1, 1981Paper

Umbilical venous-arterial differences of plasma amino acids in humans at midpregnancy

International Journal of Biological Research in Pregnancy
S HayashiK Kido

Abstract

The plasma levels of 20 free amino acids in the umbilical vein (UV) and the umbilical artery (UA) of seven newborns (20-24 weeks gestation) were measured at delivery. Seven (lys, val, leu, thr, his, ile, phe, and met) of the essential amino acids and six [ala, glu (NH2), arg, pro, 1/2 cys, and asp (NH2)] of the nonessential amino acids were shown to be significantly higher in UV than in UA. Among these amino acids, alanine showed the largest value for umbilical venous-arterial difference (UV-UA). Total plasma amino acid concentration was shown to be higher in the UV than in the UA. The general pattern of UV-UA for plasma amino acids in newborns studied here was proven to resemble closely that of premature births reported earlier.

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