Method for chromatography
The present invention relates to the field of chromatography. More closely, the invention relates to a chromatographic method for purification of Factor VIII and von Willebrand factor from a cryoprecipitate of plasma. The chromatographic method is performed on a matrix comprising an inner porous core and outer porous lid surrounding said core.
1. A chromatographic method for purification of Factor VIII (FVIII) and von Willebrand factor (vWF) from a cryoprecipitate of plasma, comprising the following steps:
loading the cryoprecipitate on a chromatography column packed with a resin comprising porous lid beads having an inner porous core and an outer porous lid, wherein the inner core is provided with octylamine ligands, wherein the outer porous lid is provided with anion exchange ligands, wherein the total lid bead thickness is 40-100 μm in diameter, and the outer porous lid thickness is 2-10 μm, and wherein a porosity of the lid and a porosity of the core does not allow entering of vWF, does not allow entering of FVIII/vWF complex, and does not allow entering of molecules larger than 500 kD;
adsorbing FVIII, vWF, or FVIII/vWF complex on said anion exchange ligands;
adsorbing undesired plasma proteins on the octylamine ligands in the core;
eluting FVIII, vWF, or FVIII/vWF complex from said anion exchange ligands; and
collecting FVIII, vWF, or FVIII/vWF complex from the column.
2. The method according to claim 1 , wherein the method comprises collecting FVIII and vWF in flow through fractions from the column.
3. The method according to claim 1 , wherein the method comprises adsorbing FVIII/vWF complex on said anion exchange ligands in the same step as adsorbing the undesired plasma proteins on the octylamine ligands in the core; and eluting FVIII/vWF complex from said anion exchange ligands.
4. The method according to claim 1 , wherein the anion exchange ligands are selected from diethylaminoethyl (DEAE), quaternary aminoethyl (QAE) or quaternary ammonium (Q).
5. The method according to claim 4 , wherein the anion exchange ligands are Q-ligands.
6. The method according to claim 1 , wherein the ligand concentration in the lid is 10-50 μmole/ml.
7. The method according to claim 1 , wherein the ligand concentration in the core is 30-85 μmole/ml.
8. The method according to claim 1 , wherein the undesired plasma proteins are human serum albumin (HSA), IgG and Factor IX (FIX).
9. The method according to claim 1 , wherein the lid and the core are made of agarose of the same porosity.
10. The method according to claim 1 , wherein the porosity of the lid is larger than the porosity of the core.
11. The method according to claim 1 , wherein the porosity of the lid is smaller than the porosity of the core.
12. The method according to claim 1 , wherein the lid and the core are made of a synthetic polymer material or a natural polymer material.