title: Characterization and optimization of a chromatographic process based on ethylenediamine-N,N,N',N'-tetra(methylphosphonic) acid-modified zirconia particles.
abstract: The primary objective of work was to characterize, optimize and model a chromatographic process based on ethylenediamine-N,N,N',N'-tetra(methylphosphonic) acid (EDTPA)-modified zirconia particles. Zirconia particles were produced by spray-drying colloidal zirconia. Zirconia spheres produced were further classified, calcined and modified with EDTPA to yield a solid-phase support for use in bio-chromatography (r_PEZ). Specifically, the ability of r_PEZ to selectively bind and enrich IgG, IgA, and IgM from biological fluids was evaluated and demonstrated. To better understand the force of interaction between the IgG and the r_PEZ, the equilibrium disassociation constant (K(d)) was determined by static binding isotherms, as a function of temperature and by frontal analysis at different linear velocities. The maximum static binding capacity (Q(max)) was found to be in the range 55-65 mg IgG per ml of beads, and unaffected by temperature. The maximum dynamic binding capacity (Q(x)) was found to be in the range 20-12 mg IgG per ml of beads. The adsorption rate constant (k(a)) was determined by a split-peak approach to be between 982 and 3242 l mol(-1) s(-1) depending on the linear velocity. The standard enthalpy and entropy values were estimated for this interaction of IgG with this novel support.
authors.affiliation: University of Nebraska, Chemical Engineering, 207L Othmer Hall, Lincoln, NE 68588-0463, USA.
authors.forename: Sabyasachi
authors.initials: S
authors.lastname: Sarkar
authors.forename: Peter W
authors.initials: PW
authors.lastname: Carr
authors.forename: Clayton V
authors.initials: CV
authors.lastname: McNeff
authors.forename: Anu
authors.initials: A
authors.lastname: Subramanian
mesh_terms: D002853:Chromatography, Liquid / Q000379:methods*; D005029:Ethylenediamines / Q000737:chemistry*; D063065:Organophosphonates / Q000737:chemistry*; D015040:Zirconium / Q000737:chemistry*
chemical_list: D005029:Ethylenediamines; D063065:Organophosphonates; C418473:ethylenediaminetetrakis(methylphosphonic) acid; D015040:Zirconium; C028541:zirconium oxide