2.3.1.84 10 - up to 2.3.1.84 10 - loss of 20% activity 2.3.1.84 10 30 enzyme retains approximately 90% and 50% of the original activity after being incubated at 10°C and 30°C for 1 h, respectively 2.3.1.84 20 - rapid inactivation above 2.3.1.84 30 - rapid inactivation 2.3.1.84 30 - 55% loss of activity after 30 min