Lipopolysaccharide removal affinity matrices based on novel cationic amphiphilic peptides

Area of Science:

• Biochemistry
• Biotechnology
• Separation Science

Background:

• Lipopolysaccharide (LPS) poses significant challenges in biopharmaceutical production.
• Cationic amphiphilic peptides (CAPs) offer a promising strategy for LPS removal.
• Factor C-derived peptides present novel candidates for affinity-based purification.

Purpose of the Study:

• To develop and evaluate novel CAP-based affinity matrices for LPS removal.
• To compare the efficacy of two newly designed peptides, S3E3 and S3E3A, in LPS decontamination.
• To investigate the impact of various process parameters on LPS removal and protein recovery.

Main Methods:

• Chemo-selective immobilization of S3E3 and S3E3A peptides onto functionalized Sepharose beads.
• Preparation of four distinct affinity matrices via amide and thioether linkages.
• Application of affinity matrices for LPS removal from bovine serum albumin (BSA) solutions.
• Optimization of influential factors (pH, NaCl, EDTA, LPS concentration) using the Plackett Burman (PB) design.

Main Results:

• Immobilized S3E3 exhibited higher LPS removal efficiency than immobilized S3E3A.
• Elevated pH and LPS concentration negatively impacted both LPS removal and protein recovery.
• Increased NaCl concentration enhanced protein recovery but diminished LPS removal efficiency.
• EDTA and buffer type showed no significant effects on the measured outcomes.

Conclusions:

• Novel CAP-based affinity matrices, particularly those using S3E3, are effective for LPS removal in biopharmaceutical contexts.
• Process conditions such as pH, NaCl, and LPS concentration critically influence purification performance.
• These findings provide a foundation for developing optimized affinity chromatography methods for endotoxin removal.