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Clinical Chemistry 32: 184-185, 1986;
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Clinical Chemistry, Vol 32, 184-185, Copyright © 1986 by American Association for Clinical Chemistry

Effects of temperature on measurement of aspartate aminotransferase and alanine aminotransferase in commercial control sera

JC Hafkenscheid and BE Kohler

The catalytic activity concentrations of aspartate aminotransferase (EC 2.6.1.1) and alanine aminotransferase (EC 2.6.1.2) in several commercial control sera were determined at three different temperatures. Although these sera were of various biological origins, the temperature-conversion factors calculated are nearly identical to those for native human sera. The proportional increase of the activity concentration caused by adding pyridoxal-5'-phosphate to the reaction mixture is independent of the reaction temperature. Arrhenius plots and some thermodynamic activation parameters of both enzymes are independent of the presence of the coenzyme pyridoxal-5'-phosphate.


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P. F. H. Franck, G. Steen, A. J. P. F. Lombarts, J. H. M. Souverijn, and R. K. A. van Wermeskerken
Multicenter harmonization of common enzyme results by fresh patient-pool sera
Clin. Chem., March 1, 1998; 44(3): 614 - 621.
[Abstract] [Full Text] [PDF]


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Copyright © 1986 by the American Association for Clinical Chemistry.