EC Number   |
Storage Stability |
|---|
    2.4.2.17 | -15°C, several months |
| 2.4.2.17 | -20°C, 50 mM Tris-HCl, pH 7.5, 0.4 mM DTT and one protease inhibitor per litre, 50% v/v glycerol, long term storage |
| 2.4.2.17 | 4°C, 0.01 M Tris, 0.10 M NaCl, 0.4 mM histidine, 2.8 mM 2-mercaptoethanol, 0.5 mM EDTA, pH 7.5, 50% loss of activity after several days |
| 2.4.2.17 | 4°C, HEPES buffer pH 7.5, final ammonium sulfate microcrystalline enzyme in 60% saturated ammonium sulfate, 0.1 M NaCl, 0.01 M Tris, 1.5 mM EDTA, 10 mM dithiothreitol, stable for 1 month, greater than 95% activity retained |
| 2.4.2.17 | storage in liquid nitrogen of quick-frozen enzyme in HEPES buffer pH 7.5, 0.1 M NaCl, 0.01 M Tris, 0.5 mM EDTA, 1 mM dithiothreitol, 1 mM histidine, indefinitely stable, preserves 100% activity. The critical factor for stability seems to be the maintenance of a sulfhydryl-reducing environment, high dithiothreitol concentrations has no adverse effect at either 0°C or 37°C |
