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Abstract
Publisher Summary The formation of γ-glutamylcysteine and the γ-glutamyl derivatives of certain amino acids are catalyzed by γ-glutamylcysteine synthetase, and many γ-glutamyl amino acids are formed by transpeptidation. γ-Glutamyl amino acids are found in brain, urine, and blood. More than 70 γ-glutamyl derivatives are isolated from plants. The separation of some γ-glutamyl amino acids by ion-exchange chromatography is described in the chapter. The separation is carried out on a Durrum D-500 amino acid analyzer using a single-column sodium citrate procedure designed for the analysis of physiological fluids. The elution times of 26 γ-glutamyl peptides is presented diagrammatically. For comparison, the elution times of a standard mixture of amino acids chromatographed under the same conditions are also presented. The γ-glutamyl derivatives of alanine, glutamic acid, asparagine, glutamine, serine, and glycine, as well as glutathione and several γ-glutamyl-γ-glutamyl amino acids, all elute together before aspartic acid.
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