Analysis of statistical thermodynamic model for binary protein adsorption equilibria on cation exchange adsorbent |
| |
Authors: | Zhou Xiaopeng Su Xueli and Sun Yan |
| |
Affiliation: | (1) Department of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China |
| |
Abstract: | A study of nonlinear competitive adsorption equilibria of proteins is of fundamental importance in understanding the behavior
of preparative chromatographic separation. This work describes the nonlinear binary protein adsorption equilibria on ion exchangers
by the statistical thermodynamic (ST) model. The single-component and binary protein adsorption isotherms of bovine hemoglobin
(Hb) and bovine serum albumin (BSA) on SP Sepharose FF were determined by batch adsorption experiments in 0.05 mol/L sodium
acetate buffer at three pH values (4.5, 5.0 and 5.5) and three NaCl concentrations (0.05, 0.10 and 0.15 mol/L) at pH 5.0.
The ST model was found to depict the effects of pH and ionic strength on the single-component equilibria well, with model
parameters depending on the pH and ionic strength. Moreover, the ST model gave acceptable fitting to the binary adsorption
data with the fitted single-component model parameters, leading to the estimation of the binary ST model parameter. The effects
of pH and ionic strength on the model parameters are reasonably interpreted by the electrostatic and thermodynamic theories.
Results demonstrate the availability of the ST model for describing nonlinear competitive protein adsorption equilibria in
the presence of two proteins. |
| |
Keywords: | equilibrium model ion exchange electrostatic adsorption binary protein adsorption |
本文献已被 万方数据 SpringerLink 等数据库收录! |
|