3.4.23.32	37	-	pH 1.5-5.5, 20 h, stable	30754	
3.4.23.32	37	-	pH 3.2-5.2, 3 h, stable	30766, 30767	
3.4.23.32	42	-	pH 4.0, 30 min, stable below	30766, 30767	
3.4.23.32	55	-	pH 4.0, 30 min, complete loss of activity	30766	
3.4.23.32	58	-	pH 4, 30 min, complete loss of activity	30767	
3.4.23.32	60	-	pH 4.0, 15 min, stable below	30754	
3.4.23.32	68	-	pH 4.0, 15 min, complete loss of activity	30754