1.11.1.1 2.8 - complete loss of activity after 2 h 1.11.1.1 3 - 19% of enzyme activity after 2 h 1.11.1.1 3.25 - 86% of enzyme activity after 2 h 1.11.1.1 3.5 - no loss of enzyme activity after 2 h 1.11.1.1 5.4 - 45 min stable