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Analysis of statistical thermodynamic model for binary protein adsorption equilibria on cation exchange adsorbent

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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.

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Authors and Affiliations

  1. Department of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China

    Zhou Xiaopeng, Su Xueli & Sun Yan

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  1. Zhou Xiaopeng
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  2. Su Xueli
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  3. Sun Yan
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Correspondence to Sun Yan.

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Zhou, X., Su, X. & Sun, Y. Analysis of statistical thermodynamic model for binary protein adsorption equilibria on cation exchange adsorbent. Front. Chem. Eng. China 1, 103–112 (2007). https://doi.org/10.1007/s11705-007-0020-x

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  • DOI: https://doi.org/10.1007/s11705-007-0020-x

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