4.1.1.92	20	-	30 min, stable	
4.1.1.92	30	-	30 min, 13% loss of initial activity	
4.1.1.92	40	-	30 min, 35% loss of initial activity	
4.1.1.92	50	-	30 min, 65% loss of initial activity	
4.1.1.92	60	-	30 min, complete loss of initial activity