PURIFICATION OF ANTIBODIES USING SIMULATED MOVING BED CHROMATOGRAPHY
The present invention relates to compositions and methods for the chromatographic purification of antibodies, such as monoclonal antibodies, employing improved simulated moving bed separation strategies and, in certain embodiments, Raman spectroscopy.
1 . A method for producing a host cell-protein (HCP) reduced target protein preparation from a sample mixture comprising a target protein and at least one HCP, said method comprising:
(a) performing Raman spectroscopy analysis of said sample mixture;
(b) contacting said sample mixture to a chromatography resin such that the resin is loaded to about 50%-100% of its saturated binding capacity; and
(c) collecting a chromatographic sample; and
(d) performing Raman spectroscopy analysis of said chromatographic sample to identify it as a HCP-reduced target protein preparation.
2 . The method of claim 1 wherein the chromatographic resin is selected from the group consisting of affinity chromatographic resin, ion exchange chromatographic resin, and hydrophobic interaction chromatographic resin.
3 . The method of claim 1 wherein the target protein is selected from the group consisting of: enzymes; peptide hormones; polyclonal antibodies; human monoclonal antibodies; humanized monoclonal antibodies; chimeric monoclonal antibodies; single chain antibodies; Fab antibody fragments; F(ab′)2 antibody fragments; Fd antibody fragments; Fv antibody fragments; isolated CDRs; diabodies; and immunoadhesions.
4 . The method of claim 1 wherein the chromatography resin is packed into a series of fluidly-connected columns separated by fluid conduits comprising inlet and outlet valves, wherein the number of fluidly connected columns is selected from the group consisting of: 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12 columns.
5 . The method of claim 1 wherein the sample mixture is contacted to the chromatography resin in order to obtain a residence time selected from the group consisting of up to about 05, up to about 1, up to about 2, up to about 3, up to about 4, up to about 5, up to about 6, up to about 7, up to about 8, up to about 9, up to about 10, up to about 11, and up to about 12 minutes.
6 . The method of claim 1 further comprising the steps of equilibrating the chromatographic resin prior to contact with the sample mixture and washing the chromatographic resin after contact with the sample mixture, where the equilibration and wash buffers are identical buffers.
7 . The method of claim 1 further comprising chromatography resin wash, elution, and regeneration steps, where such steps can be calculated and programmed in order to maintain the step of contacting the sample to the chromatography resin to be from about 20% to about 80% of the time of the process.