Abstract
Nineteen amino acids were determined in the plasma of young and older individuals by the chromatographic procedure of Moore, Spackman, and Stein (7,8). Of the essential amino acids, valine, methionine, isoleucine, leucine, phenylalanine, and lysine were found to be lower in older subjects. In all, 11 of the 19 amino acids studied showed lower values in these individuals, indicating some differences in protein metabolism between the elderly and younger adults.
- Received for publication March 1, 1962.
- © 1964 The American Association of Clinical Chemists, Inc.
