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Gamma-glutamyltransferase: evaluation of a new method
C van der Heiden1, J C Hafkenscheid, J van der Ven-Jongekrijg
1Universiteitskliniek voor kinderen en jeugdigen, Het Wilhelmina Kinderziekenhuis, Utrecht.
Journal of Clinical Chemistry and Clinical Biochemistry. Zeitschrift Fur Klinische Chemie Und Klinische Biochemie
|December 1, 1989
Summary
A new method for measuring gamma-glutamyltransferase (GGT) using L-gamma-glutamyl-3,5-dibromo-4-hydroxyanilide shows excellent precision. This GGT assay offers a viable alternative to existing methods.
Area of Science:
- Clinical chemistry
- Enzyme assays
- Biochemical diagnostics
Background:
- Gamma-glutamyltransferase (GGT) is a key enzyme in clinical diagnostics.
- Existing GGT assays rely on substrates like L-gamma-glutamyl-4-nitroanilide.
- Evaluating novel substrates is crucial for improving GGT determination.
Purpose of the Study:
- To assess the performance of a new GGT assay using L-gamma-glutamyl-3,5-dibromo-4-hydroxyanilide.
- To compare the precision and results of the new GGT method with existing assays.
- To provide temperature conversion factors for the new GGT assay.
Main Methods:
- Evaluation of a new GGT assay in two independent laboratories.
- Assessment of between-run and within-run precision.
- Comparison of GGT activity concentrations using the new substrate versus L-gamma-glutamyl-4-nitroanilide.
Main Results:
- The new GGT assay demonstrated excellent precision, comparable to established methods.
- Human serum GGT levels were slightly higher with the new substrate.
- GGT activity from animal-enriched sera showed inverse results compared to the standard method.
Conclusions:
- The novel L-gamma-glutamyl-3,5-dibromo-4-hydroxyanilide substrate provides a precise method for GGT determination.
- This new GGT assay is a potentially advantageous alternative to current methods.
- The study provides essential data, including temperature conversion factors, for implementing this new assay.