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Updated: May 2, 2026
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Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
Published on: December 24, 2014
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Quantitative evaluation of interaction force between functional groups in protein and polymer brush surfaces
Sho Sakata1, Yuuki Inoue, Kazuhiko Ishihara
1Department of Materials Engineering, ‡Department of Bioengineering, School of Engineering, The University of Tokyo , 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
Langmuir : the ACS Journal of Surfaces and Colloids
|February 26, 2014
Summary
Understanding protein adsorption on polymer surfaces is key. This study quantifies interaction forces between polymer brush surfaces and protein functional groups using atomic force microscopy, revealing how these forces predict protein adsorption behavior.
Area of Science:
- Biomaterials Science
- Surface Chemistry
- Protein-Surface Interactions
Background:
- Protein adsorption on polymer surfaces is critical for biomedical applications.
- Understanding the fundamental interactions at the molecular level is necessary to control protein behavior.
- Well-defined polymer brush surfaces are essential model systems for studying these interactions.
Purpose of the Study:
- To quantitatively evaluate interaction forces between various polymer brush surfaces and protein functional groups.
- To correlate functional group interactions with protein adsorption behavior.
- To establish interaction force at the functional group level as a predictive parameter for protein adsorption.
Main Methods:
- Preparation of well-defined polymer brush surfaces with diverse functional groups (phosphorylcholine, trimethylammonium, sulfonate, hydroxyl, n-butyl) via surface-initiated atom transfer radical polymerization.
- Quantitative evaluation of interaction forces using force-versus-distance curve measurements with atomic force microscopy (AFM) employing functional-group-functionalized cantilevers.
- Quantification of protein adsorption (albumin and lysozyme) on polymer surfaces using surface plasmon resonance (SPR).
Main Results:
- Interaction forces between polymer brush surfaces and protein functional groups (carboxyl, amino, methyl) were measured.
- Protein adsorption levels correlated directly with measured interaction forces.
- Polymer surfaces with phosphorylcholine groups exhibited the weakest interaction forces and minimal protein adsorption.
- Oppositely charged surfaces showed strong interactions with corresponding functional groups and significant protein adsorption.
Conclusions:
- Interaction forces at the functional group level are a suitable parameter for understanding and predicting protein adsorption on polymer surfaces.
- Surface chemistry, particularly the nature of functional groups, dictates protein-surface interactions and subsequent adsorption.
- The zwitterionic phosphorylcholine surface demonstrates excellent resistance to protein adsorption, highlighting its potential for biocompatible materials.
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