Multicolumn sequential separation process
A process is disclosed for separating biomolecules from an aqueous solution containing the biomolectules and impurities, having different affinities and/or interactions with a solid support. The solution is passed over a fixed bed of chromatographic resin containing at least three zones, with flow of liquid being arranged between adjacent zones and between a last and first zone. Each of several sequences includes at least an adsorption stage, a rinsing stage, or a desorption stage, with each subsequent sequence being carried out by a downstream displacement of fronts in the zones by approximately the same increment before the periodical displacement of the introduction and withdrawal points.
1. Process of separation on a solid support by selective sequential multicolumn retention for separating a product of interest from a solution containing said product of interest, by passing this solution over a fixed bed of chromatographic resin comprising at least three zones, means for flow of liquid being arranged between adjacent zones and between the last and the first zone, said process comprising several sequences, each sequence comprising at least one stage selected from an adsorption stage, a rinsing stage, a desorption stage, implemented simultaneously or not simultaneously, each subsequent sequence being carried out by the downstream displacement of the fronts in the zones by approximately the same increment before the periodical displacement of the introduction and withdrawal points, wherein the process comprises a sub-sequence without feed injection, wherein the process comprises several sequences, each sequence comprising at least one of the following stages:
(a) introduction of a certain volume of an equilibration solution at the inlet of the first zone and approximately simultaneous withdrawal of the same volume of a liquid composed firstly of regenerating solution and then of the equilibration solution, at a point situated downstream of this zone;
(b) introduction of a certain volume of the solution of feed to be treated containing the product of interest at the inlet of the second zone and approximately simultaneous withdrawal of the same volume of a liquid containing the impurity or impurities that are retained relatively less, at a point situated downstream of this zone;
(c) introduction of a certain volume of a rinsing solution at the inlet of the third zone and approximately simultaneous withdrawal of the same volume of a liquid diluted with the impurity or impurities that are retained relatively less than the product of interest, at a point situated downstream of this zone;
(d) introduction of a certain volume of eluting solution at the inlet of the fourth zone and approximately simultaneous withdrawal of the same volume of a liquid, containing the product of interest, at a point situated downstream of this zone;
(e) introduction of a certain volume of a regenerating solution at the inlet of the fifth zone and approximately simultaneous withdrawal of the same volume of a liquid containing the impurities that are retained most, at a point situated downstream of this zone;
it being for stages (a), (b), (c), (d) and (e) to be implemented simultaneously or not simultaneously;
each subsequent sequence being carried out by the periodical downstream displacement, by approximately the same volume increment, of the introduction and withdrawal points,
and in addition comprising a stage
(f) displacement of the fronts in at least zone (c) before the periodical displacement.
2. Process according to claim 1 , wherein said displacement of the fronts displaces the fronts asynchronously in the different zones.
3. Process according to claim 1 , wherein the periodical displacement of the stages is asynchronous.
4. Process according to claim 1 , wherein the chromatography is an ion exchange chromatography and the product of interest is an amino acid, preferably lysine.
5. Process according to claim 1 , wherein the chromatography is an ion exchange chromatography and the product of interest is insulin.
6. Process according to claim 1 , wherein the chromatography is an affinity chromatography and the product of interest is IgG.
7. Process according to claim 1 , wherein the chromatography is an affinity chromatography and the product of interest is a protein or a biomolecule.
8. Process according to claim 1 , wherein stages (a), (b), (c) and (d) are implemented at least partly simultaneously.
9. Process according to claim 1 , wherein stage (f) comprises a displacement of the fronts in all the zones before the periodical displacement.
10. Process according to claim 1 , wherein stage (b) comprises two substages (b1) and (b2), as well as an intermediate stage of adjustment of a parameter of the solution, in particular by the modification of the pH.
11. Process according to claim 1 , wherein the recovered rinsing solutions are sent at least partly to stage (c).