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Modeling column regeneration effects on ion-exchange chromatography
Z K López1, A Tejeda, R M Montesinos
1Departamento de Investigaciones Científicas y Tecnológicas, Universidad de Sonora, Mexico.
Journal of Chromatography. A
|February 17, 1998
Summary
In-place regeneration of DEAE-cellulose anion exchangers with sodium hydroxide does not affect equilibrium behavior but decreases protein adsorption rates over time. This impacts ion-exchange chromatography process design.
Area of Science:
- Biochemical Engineering
- Separation Science
- Chromatography
Background:
- Ion-exchange chromatography is vital for protein purification.
- Regeneration is crucial for process economics and sustainability.
- Understanding regeneration's impact on adsorption kinetics is essential for process optimization.
Purpose of the Study:
- To investigate the effect of in-place regeneration on bovine serum albumin adsorption to DEAE-cellulose.
- To determine the influence of sodium hydroxide treatment and exposure time on equilibrium and kinetic parameters.
- To assess the implications for ion-exchange chromatography process design.
Main Methods:
- Equilibrium adsorption isotherms were measured.
- Breakthrough curves were generated using fixed-bed columns.
- Adsorption rate constants were determined by analyzing breakthrough data with a simple model.
Main Results:
- In-place regeneration with sodium hydroxide did not alter equilibrium adsorption.
- The forward adsorption rate constant decreased exponentially with increasing chemical treatment exposure time.
- Kinetic performance of the anion exchanger degrades with regeneration cycles.
Conclusions:
- While equilibrium is maintained, repeated regeneration diminishes the adsorption rate of DEAE-cellulose.
- Process design must account for the kinetic decline to ensure consistent protein purification.
- Optimized regeneration protocols are needed to balance reusability and performance.