1.11.1.B8 - 20 pH 7.0, 20 min, stable 672311 1.11.1.B8 30 35 pH 7.0, 20 min, 10% loss of activity 672311 1.11.1.B8 40 - pH 7.0, 20 min, 20% loss of activity 672311 1.11.1.B8 50 60 pH 7.0, 20 min, 10% loss of activity 672311