Poly(HEMA-co-NBMI) monolithic cryogel columns for IgG adsorption.

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Separation Science

Background:

• Developing efficient materials for protein adsorption is crucial for bioseparation and purification.
• Existing methods may face challenges with capacity, selectivity, or reusability.

Purpose of the Study:

• To synthesize and characterize a supermacroporous poly(2-hydroxyethyl methacrylate-co-1,5-naphthalene bismaleimide) [poly(HEMA-co-NBMI)] cryogel.
• To evaluate its performance for the adsorption and desorption of proteins, specifically albumin and immunoglobulin G (IgG).

Main Methods:

• Free radical cryo-copolymerization of HEMA and NBMI with MBA cross-linker in a plastic syringe.
• Characterization using swelling studies, FTIR, and scanning electron microscopy (SEM).
• Adsorption/desorption experiments of IgG from aqueous solutions at varying pH.

Main Results:

• The poly(HEMA-co-NBMI) cryogel exhibited interconnected pores (10-100 μm) and an equilibrium swelling degree of 10.5 g H₂O/g.
• Maximum IgG adsorption capacity reached 98.20 mg/g at pH 7.0, with very low non-specific adsorption on plain poly(HEMA) cryogel.
• The cryogel demonstrated excellent reusability for IgG adsorption/desorption without significant capacity loss.

Conclusions:

• Supermacroporous poly(HEMA-co-NBMI) cryogel columns are effective for protein adsorption, particularly IgG.
• The material offers high adsorption capacity, selectivity, and reusability, making it promising for bioseparation applications.