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Updated: May 15, 2026
08:59
4D Imaging of Protein Aggregation in Live Cells
Published on: April 5, 2013
The Vroman effect: competitive protein exchange with dynamic multilayer protein aggregates
Stacey L Hirsh1, David R McKenzie, Neil J Nosworthy
1Applied and Plasma Physics, School of Physics, The University of Sydney, NSW 2006, Australia. s.hirsh@physics.usyd.edu.au
Colloids and Surfaces. B, Biointerfaces
|December 25, 2012
Summary
Protein layer instability, known as the Vroman effect, can be explained by multilayer aggregates turning. This dynamic process reveals how protein exchange occurs, impacting surface immobilization applications.
Area of Science:
- Biomaterials Science
- Surface Chemistry
- Biotechnology
Background:
- Surface immobilization of proteins is crucial for biomedical devices, biosensing, and bioreactors.
- Preserving synergistic protein interactions is essential but challenged by the Vroman effect.
- The Vroman effect, protein displacement on surfaces, lacks a clear mechanistic understanding.
Purpose of the Study:
- To elucidate the nanoscale mechanism behind competitive protein exchange on surfaces.
- To understand the dynamic process driving layer instabilities in protein adsorption.
- To investigate the role of multilayer aggregates in protein displacement.
Main Methods:
- Atomic force microscopy (AFM)
- Quartz crystal microbalance with dissipation monitoring (QCM-D)
- Time-of-flight secondary ion mass spectrometry (TOF-SIMS)
- In-solution time-of-flight mass spectrometry (TOF-MS)
Main Results:
- Demonstrated that competitive protein exchange occurs via the turning of multilayer protein aggregates.
- Observed a three-stage exchange process: adsorption, transient complex formation, and layer turning.
- Showed that layer turning leads to desorption of initial proteins and enrichment of later-adsorbed proteins.
Conclusions:
- The Vroman effect is explained by a dynamic process involving multilayer aggregate turning.
- This mechanism supports transient complex models of protein exchange.
- Understanding this process is key to controlling protein layer stability in various applications.
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