title: Screen-less expanded bed column: new approach for the recovery and purification of a malaria transmission blocking vaccine candidate from Pichia pastoris.
abstract: An experimental malaria transmission blocking vaccine antigen, Pfs25H, expressed and secreted from Pichia pastoris was recovered and purified using a screenless expanded bed column equipped with a rotating fluid distribution system. This column was able to accommodate feed stock, containing 30% biomass, at a flow rate of 300-400 cm/h without affecting column stability. This capability is three times higher than the capability of the expanded bed column currently in use, which is equipped with a perforated plate fluid distribution system; this design could accommodate biomass concentrations of only up to 10%. The screen-less design did not affect the binding capacity, purification level or process yield and, therefore, shorten the process. Purified Pfs25H of 6.4 g were recovered from 37 l of Pichia pastoris culture in one step.
authors.affiliation: Biotechnology Unit, NIDDK, NIH Bldg 14A, Room 173, Bethesda, MD 20892, USA.
authors.forename: Loc
authors.initials: L
authors.lastname: Trinh
authors.forename: Je-Nie
authors.initials: JN
authors.lastname: Phue
authors.forename: Pratik
authors.initials: P
authors.lastname: Jaluria
authors.forename: Chiawei W
authors.initials: CW
authors.lastname: Tsai
authors.forename: David L
authors.initials: DL
authors.lastname: Narum
authors.forename: Joseph
authors.initials: J
authors.lastname: Shiloach
mesh_terms: D018929:Cell Culture Techniques / Q000295:instrumentation*; D002852:Chromatography, Ion Exchange / Q000295:instrumentation* / Q000379:methods; D004867:Equipment Design; D019544:Equipment Failure Analysis; D017780:Malaria Vaccines / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism*; D010843:Pichia / Q000502:physiology*; D015202:Protein Engineering / Q000379:methods*; D015800:Protozoan Proteins / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism*; D011994:Recombinant Proteins / Q000302:isolation & purification / Q000378:metabolism
chemical_list: D017780:Malaria Vaccines; C071284:Pfs25 protein, Plasmodium falciparum; D015800:Protozoan Proteins; D011994:Recombinant Proteins