Characterization of protein-resistant dextran monolayers.

Area of Science:

• Biomaterials Science
• Surface Chemistry
• Nanotechnology

Background:

• Nonspecific protein adsorption is a major challenge in biomedical devices and biosensors.
• Surface modification is crucial for controlling protein interactions.
• Thiolated dextrans offer potential as biocompatible coatings.

Purpose of the Study:

• To investigate synthetic thiolated dextrans as monolayer coatings for reducing protein adsorption.
• To evaluate the impact of molecular weight and thiol substitution degree on coating properties and performance.
• To assess the protein-resistant capabilities of these thiolated dextran coatings.

Main Methods:

• Synthesis of thiolated dextrans with varying molecular weights and thiol substitution degrees.
• Surface characterization using Atomic Force Microscopy (AFM) for surface coverage.
• Surface Plasmon Resonance (SPR) analysis to quantify protein adsorption (bovine serum albumin).

Main Results:

• Surface coverage of dextran monolayers increased with higher thiol substitution.
• Surface coverage decreased with increasing dextran molecular weight.
• Thiolated dextran coatings significantly reduced protein adsorption compared to uncoated surfaces.
• Protein-resistant performance was influenced by both thiol substitution degree and molecular weight.

Conclusions:

• Well-defined thiolated dextran monolayers can be synthesized for protein adsorption reduction.
• Controlling molecular weight and thiol substitution is key to optimizing protein-resistant coatings.
• These findings support the use of thiolated dextrans in applications requiring minimized protein fouling.