1.1.1.216 30 65 purified native enzyme, 10 min at pH 7.5 in 100 mM tricine-NaOH containing 2.5 mM 2-mercaptoethanol, completely stable up to 30°C, over 90% activity up to 55°C, loss of 80% activity at 60°C, loss of 85% activity at 65°C, and inactivation at 70°C 741249 1.1.1.216 70 - stable below 760739