Aqueous two-phase protein partitioning using textile dyes as affinity ligands.

Area of Science:

• Biochemistry
• Separation Science
• Chemical Engineering

Background:

• Protein purification is crucial for biochemical research and therapeutic development.
• Existing methods can be expensive and complex.
• Novel, cost-effective separation techniques are needed.

Purpose of the Study:

• To develop a simple and inexpensive aqueous two-phase system for protein affinity partitioning.
• To investigate the use of textile dyes as affinity ligands within this system.
• To demonstrate the scalability and efficiency of the developed purification method.

Main Methods:

• Formation of an aqueous two-phase system using maltodextrin (M100) and polyvinylpyrrolidone (PVP360).
• Incorporation of textile dyes (amino derivatives of chlorotriazine or azo dyes) as affinity ligands.
• Affinity partitioning of proteins, including lysozyme and egg white proteins.
• Optimization of parameters like pH, ionic strength, dye concentration, and protein concentration.
• Protein recovery using a high-salt solution to form a secondary two-phase system.

Main Results:

• The system successfully partitioned proteins, with textile dyes increasing the partition coefficient of lysozyme up to 50-fold.
• System parameters (pH, ionic strength, dye concentration) modulated the partitioning efficiency.
• Protein concentration influenced the partitioning characteristics.
• Efficient separation of proteins from the system components (PVP360 and dye) was achieved.

Conclusions:

• The developed aqueous two-phase system offers a simple, inexpensive, and scalable method for protein affinity partitioning.
• Textile dyes serve as effective and versatile affinity ligands in this system.
• The system allows for screening of ligands and direct scale-up for protein purification.