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Controlling protein transport in ultrafiltration using small charged ligands
1Department of Chemical Engineering, The Pennsylvania State University, University Park, PA 16802, USA.
Biotechnology and Bioengineering
|May 17, 2005
Summary
Controlling protein transmission during ultrafiltration is possible by adding a charged ligand. Cibacron Blue significantly reduced bovine serum albumin (BSA) passage through charged membranes, demonstrating ligand-mediated filtration control.
Area of Science:
- Biomolecular engineering
- Separation science
- Membrane technology
Background:
- Protein transport during ultrafiltration is sensitive to solution pH and ionic strength.
- Existing methods for controlling protein transmission are limited.
Purpose of the Study:
- To investigate the use of a small, highly charged ligand for selective protein control during ultrafiltration.
- To assess the impact of electrostatic interactions on protein sieving.
Main Methods:
- Ultrafiltration experiments using bovine serum albumin (BSA) and Cibacron Blue dye.
- Utilized neutral and negatively charged regenerated cellulose membranes.
- Analyzed protein sieving coefficients under varying conditions.
Main Results:
- 1 g/L Cibacron Blue reduced BSA sieving by over two orders of magnitude in negatively charged membranes.
- This effect was diminished with neutral membranes and at high salt concentrations.
- Experimental data aligned well with theoretical models of charged sphere partitioning in charged pores.
Conclusions:
- Selective protein binding with charged ligands offers a viable strategy for controlling ultrafiltration.
- Electrostatic interactions play a crucial role in ligand-mediated protein sieving.
- This approach has potential for targeted protein separation in bioprocessing.
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