title: Purification of recombinant brain derived neurotrophic factor using reversed phase displacement chromatography.
abstract: This work investigates the utility of RPLC displacement chromatography for the purification of recombinant brain derived neurotrophic factor (rHu-BDNF) from its variants and E. coli. protein (ECP) impurities. The closely associated variants (six in total) differ by one amino acid from the native BDNF and thus pose a challenging separation problem. Several operational parameters were investigated to study their effects on the yield of the displacement process. The results indicated that the concentration of trifluoroacetic acid (TFA) in the buffer was a key factor in achieving the desired purification. Displacement chromatography on an analytical scale column resulted in extremely high purity and yield in a single chromatographic step. The process was successfully scaled-up with respect to particle and column diameter. The production rate of a pilot scale RPLC displacement process was shown to be 23 times higher than the combined production rates of the current preparative ion exchange and hydrophobic interaction gradient elution steps that are used to remove variant and ECP impurities, respectively.
authors.affiliation: Department of Chemical Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, USA.
authors.forename: K M
authors.initials: KM
authors.lastname: Sunasara
authors.forename: R G
authors.initials: RG
authors.lastname: Rupp
authors.forename: S M
authors.initials: SM
authors.lastname: Cramer
mesh_terms: D019208:Brain-Derived Neurotrophic Factor / Q000302:isolation & purification* / Q000494:pharmacology / Q000592:standards; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects; D002851:Chromatography, High Pressure Liquid; D002852:Chromatography, Ion Exchange; D006801:Humans; D000644:Quaternary Ammonium Compounds / Q000737:chemistry; D011994:Recombinant Proteins / Q000302:isolation & purification / Q000494:pharmacology / Q000592:standards; D014269:Trifluoroacetic Acid / Q000737:chemistry
chemical_list: D019208:Brain-Derived Neurotrophic Factor; D000644:Quaternary Ammonium Compounds; D011994:Recombinant Proteins; C055292:tetrahexylammonium; D014269:Trifluoroacetic Acid