Enhancing protein capacity of rigid macroporous polymeric adsorbent

Area of Science:

• Polymer Chemistry
• Bioseparation Engineering
• Materials Science

Background:

• Protein adsorption is crucial for bioseparation and purification.
• Developing efficient anion-exchange resins with high capacity is essential for these processes.
• Existing resins may have limitations in capacity or pore structure for optimal protein binding.

Purpose of the Study:

• To synthesize and characterize a novel macroporous anion-exchange resin for protein adsorption.
• To optimize the resin's copolymer composition for enhanced protein ion exchange capacity.
• To evaluate the adsorption performance using bovine serum albumin (BSA) as a model protein.

Main Methods:

• Synthesis of a macroporous poly(glycidyl methacrylate-triallyl isocyanurate-divinylbenzene) resin.
• Modification of the resin with diethylamine to create anion-exchange functionality.
• Characterization using specific surface area measurements and mercury porosimetry for pore size distribution.
• Protein adsorption studies using bovine serum albumin (BSA).

Main Results:

• The synthesized resin exhibited a favorable intraparticle pore size distribution (75% of total pore volume in 40-120 nm range) for protein adsorption.
• Optimized resin composition achieved a high BSA adsorption capacity of 78.6 mg/g wet resin or 50 mg/mL packed volume.
• Effective pore diffusivity of BSA was determined to be 5.5 x 10(-12) m(2)/s, comparable to commercial ion exchangers.

Conclusions:

• The novel macroporous anion-exchange resin demonstrates excellent potential for protein adsorption applications.
• The optimized resin offers a high protein binding capacity, exceeding some commercially available alternatives.
• The pore structure and diffusivity characteristics are suitable for efficient protein ion exchange processes.