Method and device for fast dissolution of solid protein composition
Provided are methods and devices for dissolving solid protein compositions, such as solid compositions comprising fibrinogen, in an aqueous solvent. The methods comprise use of a closed container containing a volume of solid fibrinogen composition and a head space wherein the pressure within the headspace is sub-atmospheric. Aqueous solvent is introduced into the container while maintain the sub-atmospheric pressure, and subsequent to addition of the solvent, the size of the headspace is decreased to bring the pressure to atmospheric pressure. The devices are suitable for use in the disclosed method.
1. A method for dissolving a solid fibrinogen composition in an aqueous solvent while minimizing or avoiding the presence of foam, comprising:
i) providing a closed container containing: a volume of the solid fibrinogen composition and a head space, wherein the internal pressure within the headspace is a sub-atmospheric pressure being not more than 500 mBar;
ii) while maintaining the internal pressure in the headspace at the sub-atmospheric pressure, introducing into the container a volume of the aqueous solvent which is less than the volume of the solid fibrinogen composition to form a solution comprising at least 40 mg fibrinogen/ml, wherein the pressure in the headspace is maintained at the sub-atmospheric level after introducing the entire volume of the aqueous solvent into the container;
iii) subsequent to ii), decreasing the size of the headspace in the container by decreasing the internal volume of the container and without allowing entry of air into the container until the internal pressure in the headspace equals atmospheric pressure; and
iv) agitating the solution until the fibrinogen dissolves,
wherein the aqueous solvent is contained within a reservoir,
wherein the container and the reservoir are in mutual fluid communication,
wherein the agitating comprises repeatedly transferring the aqueous solvent between the container and the reservoir and
wherein the dissolving is carried out over a period of up to 90 sec.
2. The method according to claim 1 , wherein the solid fibrinogen composition is a lyophilized cake.
3. The method according to claim 1 , wherein the density of fibrinogen in the solid fibrinogen composition is in the range of from at least 5 to lower than 63 mg/cc.
4. The method according to claim 3 , wherein the density of fibrinogen is not more than 23 mg/cc.
5. The method according to claim 1 , wherein the fibrinogen concentration in the obtained solution is from 40 mg/ml to 120 mg/ml.
6. The method according to claim 1 , wherein the aqueous solvent is a degassed aqueous solvent.
7. The method according to claim 1 , wherein the internal pressure in the headspace in step i) is not more than 0.12 mBar.
8. The method according to claim 1 , when a time interval of at least 5 seconds is allowed to elapse between completion of step ii) and commencement of step iii).
9. The method according to claim 8 , wherein the time interval is at least 20 seconds.
10. The method according to claim 1 , further comprising incubating the solution in the container.
11. The method according to claim 10 , wherein the incubating is carried out for no longer than 2 minutes.