Upconversion Colloid for Tracking Cellular Uptake of Nanoparticles

Area of Science:

• Nanotechnology
• Materials Science
• Biomedical Engineering

Background:

• Upconverting nanoparticles (UCC) convert infrared light to visible/UV light, offering technological potential.
• Lanthanide-based nanoparticles (~10 nm) are key components for upconversion applications.
• Surface modification is crucial for nanoparticle stability and functionality in biological systems.

Purpose of the Study:

• To synthesize and characterize high-quality upconverting nanoparticles (UCC).
• To enhance the colloidal stability and aqueous dispersibility of UCC.
• To evaluate the in vitro cell uptake and potential applications of modified UCC.

Main Methods:

• Synthesized UCC using high-temperature coprecipitation and hydrothermal treatment.
• PEGylated UCC with PEG-alendronate (PEG-Ale) for improved aqueous dispersion.
• Characterized nanoparticles via electron microscopy, dynamic light scattering, and fluorescence microscopy.

Main Results:

• Achieved stable, ~10 nm lanthanide-based upconverting nanoparticles (UCC).
• PEG-Ale modification enhanced colloidal stability and upconversion emission.
• Demonstrated in vitro internalization of UCC@Ale-PEG by epithelial cells and macrophages.

Conclusions:

• Developed a new generation of upconverting nanoparticles (UCC) with enhanced properties.
• Surface-modified UCC show promising biocompatibility and cell uptake.
• These UCCs have broad application potential in biomedicine, bioengineering, and environmental science.