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Protein partitioning driven by excluded-volume interactions in an aqueous nonionic micellar-gel system
Dick van Roosmalen1, Matthew J Lazzara, Leo J P van den Broeke
1Department of Chemical Engineering, Room 66-444, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge 02139, USA.
Biotechnology and Bioengineering
|August 27, 2004
Summary
A novel aqueous micellar-gel system (AMGS) utilizes excluded-volume principles for biomolecule separation. This method offers enhanced versatility and adaptability compared to traditional systems, with partitioning dependent on biomolecule size.
Area of Science:
- Biochemistry
- Separation Science
- Materials Science
Background:
- Excluded-volume interactions are established for biomolecule separation in aqueous media.
- Conventional two-phase aqueous micellar systems have limitations in versatility and temperature dependence.
Purpose of the Study:
- To introduce and validate a new aqueous micellar-gel system (AMGS) for biomolecule separation.
- To demonstrate the AMGS's advantages over conventional micellar systems, including temperature independence and elimination of entrainment.
Main Methods:
- Development of an AMGS using cylindrically shaped n-decyl tetra (ethylene oxide) (C10E4) micelles.
- Physical separation of an outer aqueous micellar phase from an inner aqueous phase within gel beads.
- Partitioning experiments with myoglobin, ovalbumin, BSA-FITC, and G6PD to assess biomolecule behavior.
Main Results:
- Biomolecules preferentially partitioned into the gel-bead phase based on size due to excluded-volume interactions.
- Measured partition coefficients were less than unity and decreased with increasing biomolecule size.
- A theoretical model based on excluded-volume principles accurately predicted the observed partitioning behavior.
Conclusions:
- The developed AMGS is a feasible and effective method for biomolecule separation.
- The AMGS offers improved versatility and adaptability compared to existing micellar separation techniques.
- Excluded-volume interactions govern biomolecule partitioning in the AMGS, providing predictable separation based on size.