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Exploring the Coating of Gold Nanoparticles with Lipids
Mireia Vilar-Hernández1,2, Jasper van Weerd2, Pascal Jonkheijm1
1Laboratory of Biointerface Chemistry, Department of Molecules and Materials, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.
Coating gold nanoparticles (AuNPs) with phospholipids using a seed-growth method shows promise for improving stability. Phosphatidylglycerol coatings were more stable than zwitterionic lipids, though further optimization is needed for reproducibility and neutral surface charge.
Area of Science:
- Nanotechnology
- Materials Science
- Biomedical Engineering
Background:
- Gold nanoparticles (AuNPs) exhibit unique optical properties, including localized surface plasmon resonance, valuable for photothermal therapy and molecular detection.
- Surface coatings are crucial for enhancing nanoparticle circulation time and biocompatibility by masking hydrophobic characteristics.
Purpose of the Study:
- To explore the seed-growth method for coating AuNPs with phospholipids.
- To improve the colloidal stability and biocompatibility of AuNPs for biomedical applications.
Main Methods:
- Investigated the seed-growth method to apply phospholipid coatings onto gold nanoparticles.
- Characterized particle size and zeta potential of coated AuNPs using various charged phospholipids.
Main Results:
- Monodispersity of coated AuNPs depended on the size distribution of gold nanoparticle seeds and lipid vesicles.
- Coatings with phosphatidylglycerol maintained nanoparticle stability, unlike zwitterionic lipids such as phosphatidylcholine.
- Achieving stable AuNPs with zwitterionic lipids proved challenging.
Conclusions:
- Phospholipid coating of AuNPs via seed-growth is a viable strategy but requires further optimization.
- Enhancing reproducibility and achieving stable AuNPs with a near-neutral surface charge are key areas for future development.
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