title: Experimental and numerical studies of the chromatofocusing of dilute proteins using retained pH gradients formed on a strong-base anion-exchange column.
abstract: The separation of dilute protein mixtures was achieved using simple monovalent buffering species to form retained, internally produced pH gradients on a strong-basic anion-exchange column. Highly focused proteins bands localized on stepwise pH transitions were produced experimentally under trace and volume overloaded feed conditions. Numerical simulations were performed that accurately predict the pH profile and protein band shapes in the column effluent. Experimental results were combined with numerical investigations to explore strategies for designing efficient preparative-scale chromatofocusing systems using simple, inexpensive buffers and adsorbents.
authors.affiliation: Department of Chemical and Biochemical Engineering, University of Maryland Baltimore County 21228, USA.
authors.forename: J C
authors.initials: JC
authors.lastname: Strong
authors.forename: D D
authors.initials: DD
authors.lastname: Frey
mesh_terms: D002021:Buffers; D002852:Chromatography, Ion Exchange / Q000379:methods*; D003207:Conalbumin / Q000302:isolation & purification; D006454:Hemoglobins / Q000302:isolation & purification; D006863:Hydrogen-Ion Concentration; D010047:Ovalbumin / Q000302:isolation & purification; D011506:Proteins / Q000032:analysis / Q000302:isolation & purification*; D012685:Sepharose; D012709:Serum Albumin / Q000302:isolation & purification
chemical_list: D002021:Buffers; D006454:Hemoglobins; D011506:Proteins; D012709:Serum Albumin; D003207:Conalbumin; D010047:Ovalbumin; D012685:Sepharose