[Long-term stability of Kallidinogenase Reference Standard].Eisei Shikenjo Hokoku. 1989ES
The long-term stability of Kallidinogenase Reference Standard of National Institutes of Hygienic Sciences was studied. The standard was kept for a long term (60 months) at -5 degrees C, 20 degrees C, 37 degrees C and 50 degrees C. No decrease in kallidinogenase activity was observed at 60 months at -5 degrees C and 28 months at 20 degrees C. The decrease in the activity of the standard kept at 37 degrees C was only 7% at 10 months. The standard kept at 50 degrees C had lost nearly all activity at 4 months. Therefore, "Kallidinogenase Standard" was stable for prolonged storage (about 5 years) at -5 degrees C.