title: Factorial screening of antibody purification processes using three chromatography steps without protein A.
abstract: Protein A affinity chromatography is often employed as a capture step to meet the purity, yield, and throughput requirements for pharmaceutical antibody purification. However, a trade-off exists between step performance and price. Protein A resin removes 99.9% of feed stream impurities; however, its price is significantly greater than those of non-affinity media. With many therapeutic indications for antibodies requiring high doses and/or chronic administration, the consideration of process economics is critical. We have systematically evaluated the purification performance of cation-exchange, anion-exchange, hydroxyapatite, hydrophobic interaction, hydrophobic charge induction, and small-molecule ligand resins in each step of a three-step chromatographic purification process for a CHO-derived monoclonal antibody. Host cell proteins were removed to less-than-detectable for three processes (cation-exchange-anion-exchange-hydrophobic interaction chromatography, cation-exchange-anion-exchange-mixed cation-exchange chromatography, and cation-exchange-mixed cation-exchange-anion-exchange chromatography). The order of the process steps affected purification performance significantly.
authors.affiliation: Department of Recovery Sciences, Genentech Inc., 1 DNA Way, South San Francisco, CA 94080, USA. dfollman@purdue.edu
authors.forename: Deborah K
authors.initials: DK
authors.lastname: Follman
authors.forename: Robert L
authors.initials: RL
authors.lastname: Fahrner
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000737:chemistry / Q000302:isolation & purification*; D016466:CHO Cells; D002846:Chromatography, Affinity / Q000379:methods*; D002852:Chromatography, Ion Exchange / Q000379:methods*; D006224:Cricetinae; D004797:Enzyme-Linked Immunosorbent Assay; D006801:Humans; D011994:Recombinant Proteins / Q000737:chemistry / Q000302:isolation & purification; D013205:Staphylococcal Protein A / Q000737:chemistry*
chemical_list: D000911:Antibodies, Monoclonal; D011994:Recombinant Proteins; D013205:Staphylococcal Protein A