J. H. Watts, B. Tolbert, W. Ruff
Feb 1, 1964
Citations
0
Influential Citations
22
Citations
Journal
Metabolism: clinical and experimental
Abstract
Abstract Six young male adults were fed constant intakes of purified essential amino acids and of total nitrogen(N), 4 Gm. Although glycine is a nonessential amino acid (NEAA), in this study it was fed always with diammonium citrate and not with the mixture of 7 NEAA. In 1 period 53 per cent of dietary N was provided by NEAA and the mean N balance was −0.14 Gm. per day. In another period 53 per cent of dietary N was provided by glycine + diammonium citrate, and mean N balance was −0.02 Gm. per day. The results indicated no difference in N balances for the 2 sources of nonessential nitrogen, when 4.0 Gm. N are fed. Following adjustment to a 10 Gm. N intake, the same subjects were given a constant intake of purified essential amino acids and 3 variations in source of nonessential N. When 1.2 per cent of dietary N was furnished by NEAA, the mean N retention was 0.35 Gm. per day. When 0.6 per cent of N intake was provided by NEAA, the mean N retention was 0.66 Gm. per day. When the only nonessential amino acids ingested were those of the basal diet, mean N retention was 0.56 Gm. per day. Although retentions were higher in the absence of purified NEAA and when 0.6 per cent of dietary N was furnished by NEAA than when 1.2 per cent of the N intake was provided by NEAA, differences between means were not statistically significant at the 1 per cent level.