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Updated: Jul 8, 2026

Monitoring Protein Adsorption with Solid-state Nanopores
Published on: December 2, 2011
Control of protein adsorption: molecular level structural and spatial variables
David J Vanderah1, Hongly La, Jessica Naff
1Biotechnology Division, Chemical Science and Technology Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8313, USA. david.vanderah@nist.gov
Oligo(ethylene oxide)-coated gold surfaces minimize protein adsorption by constricting oligomers, creating an energy barrier. This protein rejection mechanism offers insights into surface science and biomaterial design.
Area of Science:
- Surface Chemistry
- Biomaterials Science
- Protein Adsorption
Background:
- Protein adsorption on surfaces is critical for biomaterial performance.
- Self-assembled monolayers (SAMs) are used to modify surface properties.
- Oligo(ethylene oxide) (OEO) coatings are investigated for protein resistance.
Purpose of the Study:
- To quantify protein adsorption on OEO-modified gold surfaces.
- To elucidate the mechanism of protein rejection by OEO SAMs.
- To understand the relationship between surface coverage and protein adsorption.
Main Methods:
- Surface Plasmon Resonance (SPR) for adsorption determination.
- Reflection-Absorption Infrared Spectroscopy (RAIR) for film structure analysis.
- Systematic variation of OEO SAM coverage on gold.
Main Results:
- Minimal protein adsorption (fibrinogen, BSA) observed between 60% and 80% OEO SAM coverage.
- Loosely packed, uniformly distributed oligomers indicated by RAIR data.
- Protein rejection mechanism linked to increased system free energy (ΔGsystem) due to oligomer constriction.
Conclusions:
- OEO-modified surfaces effectively reject proteins via an entropic penalty.
- Protein rejection is optimized at specific OEO surface coverages.
- Molecular-level understanding of protein-surface interactions is enhanced.
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