Competitive protein adsorption on biomaterial surface studied with reflectometric interference spectroscopy

Area of Science:

• Biomaterials Science
• Surface Chemistry
• Biophysics

Background:

• Biomaterial surface properties significantly influence protein adsorption, impacting biocompatibility.
• Understanding competitive protein adsorption is crucial for designing advanced medical materials.
• Fluorocarbon end-capped poly(carbonate) urethane (PCUF) and polystyrene (PS) are widely studied biomaterials with distinct surface characteristics.

Purpose of the Study:

• To investigate and compare competitive protein adsorption on PCUF and PS surfaces.
• To evaluate the efficacy of Reflectometry Interference Spectroscopy (RIfS) for label-free, real-time analysis of protein-surface interactions.
• To correlate surface properties with protein adsorption behavior and potential biocompatibility.

Main Methods:

• Surface characterization using contact angle measurements and atomic force microscopy (AFM).
• Calculation of interfacial energies between material surfaces and proteins.
• Protein adsorption experiments using single and ternary solutions (albumin, fibrinogen, IgG) analyzed with RIfS.

Main Results:

• PCUF exhibited higher hydrophilicity and lower surface energy compared to PS, with observed micro-phase separation.
• RIfS demonstrated preferential adsorption of albumin onto PCUF, with reduced adsorption of fibrinogen and IgG.
• Competitive adsorption patterns differed significantly between PCUF and PS surfaces.

Conclusions:

• PCUF demonstrates superior selectivity for albumin adsorption compared to PS, potentially contributing to better biocompatibility.
• RIfS is a powerful tool for real-time, label-free assessment of competitive protein adsorption on biomaterials.
• Surface morphology, energy, and interfacial energetics play key roles in dictating protein-surface interactions.