American Journal of Clinical Nutrition, Vol 37, 188-191, Copyright © 1983 by The American Society for Clinical Nutrition, Inc

ORIGINAL RESEARCH COMMUNICATIONS

Cyst(e)ine measurements during total parenteral nutrition

MH Malloy, DK Rassin and CJ Richardson

Using a method that measures plasma protein-bound 1/2 cystine, plasma free cyst(e)ine, and urine free cyst(e)ine, we have observed that infants receiving total parenteral nutrition supplemented with cysteine- HCl have significantly higher plasma and urine free cyst(e)ine concentrations (11.3 +/- 3.4 microns/dl and 47.2 +/- 24.0 microns/dl, means +/- SD) than when 1/2 cystine concentrations are measured by automated amino acid analysis (7.4 +/- 2.0 microns/dl, plasma and 25.0 +/- 7.0 microns/dl, urine). These data suggest that both the sulfhydryl and disulfide form of cyst(e)ine must be measured to assess the effect of cysteine-HCl supplemented total parenteral nutrition.

This article has been cited by other articles:

				G. Courtney-Martin, K. P Chapman, A. M Moore, J. H Kim, R. O Ball, and P. B Pencharz Total sulfur amino acid requirement and metabolism in parenterally fed postsurgical human neonates Am. J. Clinical Nutrition, July 1, 2008; 88(1): 115 - 124. [Abstract] [Full Text] [PDF]

				M. P. Fuhrman, V. M. Herrmann, and G. S. Smith Clinical Research; Reactive Oxygen Species and Glutathione: Potential for Parenteral Nutrition Supplementation? Nutr Clin Pract, October 1, 1999; 14(5): 254 - 263. [Abstract] [PDF]