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Updated: Aug 14, 2026

LERLIC-MS/MS for In-depth Characterization and Quantification of Glutamine and Asparagine Deamidation in Shotgun Proteomics
Published on: April 9, 2017
Studies on gamma-glutamyl transpeptidase of human urine
Abstract:
A simple and rapid method suitable for clinical laboratories, for the removal of the inhibitors in urine of gamma-glutamyl transpeptidase activity, using an ion-retardation resin, is described. Gel chromatography of urine resulted in appreciable loss of the enzyme activity. Freezing at -5 degrees C and thawing, did not affect the activity of the enzyme. Dimethyl sulfoxide and polyvinyl pyrrolidone up to a creatinine and NaCl at levels found in normal urine did not inhibit the transpeptidase.
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