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Driving forces for phase separation and partitioning in aqueous two-phase systems
H O Johansson1, G Karlström, F Tjerneld
1Biotechnology Laboratory, The University of British Columbia, Vancouver, Canada.
Summary
Simple equations from Flory-Huggins theory explain phase separation and protein partitioning in aqueous two-phase systems. This model aids in understanding and selecting systems for industrial separations.
Area of Science:
- Physical Chemistry
- Biochemical Engineering
- Separation Science
Background:
- Aqueous two-phase systems (ATPS) are crucial for bioseparations.
- Understanding phase separation and solute partitioning is key to optimizing ATPS applications.
- Existing models may not fully capture the complex driving forces in diverse ATPS.
Purpose of the Study:
- To develop a simple analytical model based on Flory-Huggins theory.
- To identify dominant driving forces for phase separation and solute partitioning in ATPS.
- To provide a fundamental tool for selecting appropriate ATPS for specific separations.
Main Methods:
- Derivation of analytical equations from Flory-Huggins theory.
- Application of the model to various ATPS classes, including polymer-polymer, polymer-salt, and thermoseparating systems.
- Analysis of enthalpic and entropic contributions to partitioning.
Main Results:
- The derived model successfully captures the fundamental behavior of ATPS.
- The model accurately predicts experimental trends in solute partitioning.
- Case studies reveal distinct enthalpic and entropic contributions across different ATPS types.
Conclusions:
- The Flory-Huggins-derived model offers a simplified yet effective approach to understanding ATPS.
- The model provides insights into the driving forces governing phase separation and partitioning.
- This work equips practitioners and industry with a valuable tool for ATPS selection and optimization.