Stable protease composition
A composition, serine protease technology, applied in the field of enzyme composition, can solve the problem of loss of enzyme initial activity and so on
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Embodiment 1
[0132] Example 1 - Stabilization of human thrombin
[0133] To determine the procoagulant activity of the thrombin solution, the coagulation of the fibrinogen solution (1.3 mg / ml) was determined after addition of different dilutions of a specific human thrombin (from plasma, 3300 units / mg, Biovitrum AB, Sweden) solution time. Clotting times were measured with an Amelungen Kc 1 hemagglutination meter (Amelungen, Germany). In order to study the stability of thrombin solutions with different additives, the samples were incubated in a constant temperature chamber maintained at 37°C. Aliquots were taken at various time intervals and the thrombin activity retained in these aliquots was determined. Activity decay curves can be constructed from the values obtained.
[0134] The activity decay curve of a 1 mg / ml solution of thrombin in 10 mM HEPES, 0.13 M NaCl buffer, pH 7.4 showed a T 70% value of approximately 1.6 days at 37°C. Corresponding experiments at room temperature (abo...
Embodiment 2
[0139] Example 2 - Stabilization of bovine thrombin
[0140]The stabilization of bovine thrombin was studied. The experimental procedure was the same as in Example 1, but the concentration of bovine thrombin (Baxter) used was 0.4 mg / ml. The thrombin solution in HEPES buffer showed a T 70% value of 1.3 days when stored at 37°C. A solution of thrombin in HEPES buffer plus 3.0 mM N-(2'-phenoxy)-4-aminopyridine and 0.20 M MOPS showed a T70% value of 54 days.
[0141] The results obtained show that bovine thrombin is somewhat less stable than the human thrombin preparations studied, but that a very good stabilization is obtained by the combination according to the invention.
Embodiment 3
[0142] Example 3 - Low concentration of thrombin
[0143] The stabilization of thrombin in compositions comprising low concentrations of thrombin was investigated. The stabilizing effect of the combination according to the invention has also been shown to be usable at relatively low concentrations of thrombin.
[0144] A solution of 15.0 activity units / ml of human thrombin (from plasma, 3300 units / mg, Biovitrum AB, Sweden) in HEPES buffer, pH 7.4 showed a T 70% value of 23 days. The corresponding solution in HEPES buffer, pH 7.4 plus 2.0 mM N-(2'-phenoxy)-4-aminopyridine and 0.20 M MOPS showed a T 70% value of 92 days.
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