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Preparation of Nanoparticles for ToF-SIMS and XPS Analysis
Published on: September 13, 2020
Protein-nanoparticle interactions: the effects of surface compositional and structural heterogeneity are scale
Rixiang Huang1, Randy P Carney, Francesco Stellacci
1Department of Geology, Baylor University, One Bear Place #97354, Waco, Texas 76798, USA.
Nanoscale
|June 22, 2013
Summary
Surface heterogeneity on gold nanoparticles (AuNPs) significantly influences protein adsorption, affecting nanoparticle-protein complex formation and protein structure. The scale of heterogeneity and protein size are key factors in these interactions.
Area of Science:
- Biomaterials Science
- Nanotechnology
- Protein Chemistry
Background:
- Proteins adsorb onto nanoparticles (NPs) forming a 'corona' in biological environments.
- Understanding nanoparticle-protein interactions is crucial for NP applications in biology and medicine.
Purpose of the Study:
- To investigate the impact of surface compositional and structural heterogeneity on protein adsorption onto gold nanoparticles (AuNPs).
- To systematically examine how the length-scale of surface heterogeneity influences nanoparticle-protein interactions.
Main Methods:
- Dynamic light scattering (DLS) and circular dichroism (CD) spectroscopy to analyze protein-NP interactions at different pH.
- Isothermal titration calorimetry (ITC) to study the thermodynamics of protein adsorption onto various AuNP surfaces.
Main Results:
- Protein adsorption and secondary structure integrity varied with pH, indicating charge-dependent interactions.
- Ubiquitin adsorption differed significantly across AuNPs with varying surface heterogeneity scales.
- Fibrinogen adsorption showed less dependence on AuNP surface heterogeneity compared to ubiquitin.
Conclusions:
- Nanoparticle surface heterogeneity plays a critical role in modulating protein adsorption.
- The influence of surface heterogeneity is dependent on its length-scale and the size of the adsorbed protein.
- These findings provide insights into designing NPs with controlled surface properties for specific biological applications.
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