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Plasmid DNA partitioning and separation using poly(ethylene glycol)/poly(acrylate)/salt aqueous two-phase systems
Hans-Olof Johansson1, Tiago Matos, Juliana S Luz
1Department of Biochemistry and Structural Biology, University of Lund, P.O. Box 124, S-22100 Lund, Sweden. Hans-Olof.Johansson@biochemistry.lu.se
Journal of Chromatography. A
|March 7, 2012
Summary
This study shows how to separate plasmid DNA from proteins using poly(ethylene glycol)/polyacrylate/Na(2)SO(4) systems. Adjusting pH and polymer size effectively directs plasmid DNA partitioning for bioseparation.
Area of Science:
- Biochemistry
- Polymer Science
- Bioseparation Technology
Background:
- Aqueous two-phase systems (ATPS) are valuable for bioseparation.
- Controlling phase partitioning of biomolecules like plasmid DNA is crucial for efficient purification.
- Existing ATPS methods may require optimization for specific biomolecules and contaminants.
Purpose of the Study:
- To investigate the phase behavior of poly(ethylene glycol)/polyacrylate/Na(2)SO(4) systems for plasmid DNA purification.
- To explore the influence of polymer molecular weight and pH on plasmid DNA partitioning.
- To develop efficient bioseparation processes for isolating plasmid DNA from bacterial proteins.
Main Methods:
- Phase diagram analysis of poly(ethylene glycol)/polyacrylate/Na(2)SO(4) systems.
- Investigating the partitioning of plasmid DNA, bovine serum albumin (BSA), and E. coli homogenate proteins.
- Developing and evaluating two-step bioseparation processes based on controlled phase partitioning.
Main Results:
- Plasmid DNA partitioning is dependent on pH and polymer molecular weight in the investigated ATPS.
- Proteins (BSA and E. coli homogenate) exhibit partitioning behavior opposite to plasmid DNA.
- Developed bioseparation processes achieved a total yield of 60-70% for plasmid DNA.
- The polyacrylate/PEG system demonstrated significant changes in partitioning with minor adjustments in composition or pH.
Conclusions:
- Poly(ethylene glycol)/polyacrylate/Na(2)SO(4) ATPS offer tunable conditions for selective plasmid DNA purification.
- The developed bioseparation processes provide efficient and high-yield isolation of plasmid DNA.
- The polyacrylate/PEG system presents a novel and sensitive platform for biomolecule separation in biotechnology.
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