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Gamma-Glutamyltransferase (GGT), formerly called gamma-glutamyltranspeptidase, is predominantly a membrane-bound enzyme. The estimation of enzyme activity in serum is useful in monitoring hepatobiliary complaints. The electrophoresis with surfactant (Triton X-100) developed by the authors demonstrates five distinct bands of enzyme activity in the serum from patients with hepatitis. These bands are called isoenzyme GGT1 to 5 from anode to cathode, respectively. Four isoenzymes GGT2 to 5, except GGT1 are demonstrated in normal adult serum. The affinity electrophoresis is more variable to identify the hepatoma associated isoenzyme, namely HA-GGT. Concanavalin A used in the method has no affinity with HA-GGT and this isoenzyme is separated from GGT2. The diagnostic sensitivity and specificity for the measurement of HA-GGT were 58% and 83%, respectively.
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