Mitigating Membrane Biofouling in Protein Production with Zwitterionic Peptides

Area of Science:

• Biomaterials Science
• Surface Chemistry
• Biotechnology

Background:

• Biofouling on polymeric membranes impedes protein production and separation.
• Developing effective antifouling strategies is crucial for bioprocessing efficiency.

Purpose of the Study:

• To investigate the antifouling properties of zwitterionic peptides on gold substrates and polymeric membranes.
• To evaluate the impact of peptide sequence length and grafting density on antifouling performance.

Main Methods:

• Functionalization of gold chips and polymeric membranes with zwitterionic peptides (alternating lysine and glutamic acid).
• Assessment of antifouling performance in protein-rich environments mimicking protein production.
• Analysis of the effect of peptide sequence length, hydrophilic linkers, and grafting density.

Main Results:

• Zwitterionic peptides significantly reduced biomolecular fouling on both gold substrates and polymeric membranes.
• Longer zwitterionic peptide sequences, combined with hydrophilic linkers, demonstrated superior antifouling capabilities.
• Increased grafting density of peptides further enhanced the antifouling properties of the functionalized surfaces.

Conclusions:

• Zwitterionic peptides show significant promise as antifouling agents in protein production and separation.
• The findings support the development of zwitterionic peptide-based materials for advanced polymeric membranes.
• This research contributes to understanding antifouling mechanisms in cell culture and bioprocessing environments.