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Peptide-coated semiconductor nanocrystals for biomedical applications.
X Michalet1, F F Pinaud1, L A Bentolila1
1Dpt of Chemistry & Biochemistry, UCLA, 607 Charles E. Young Drive East, Los Angeles, CA 90095.
Proceedings of Spie--The International Society for Optical Engineering
|November 28, 2017
Summary
Researchers created stable, bright, water-soluble semiconductor nanocrystals (NCs) using a novel peptide-coating method. This biocompatible approach enhances NCs for advanced biomedical imaging applications.
Area of Science:
- Nanotechnology
- Biomedical Engineering
- Materials Science
Background:
- Semiconductor nanocrystals (NCs) are promising for imaging but often face stability and biocompatibility challenges.
- Surface ligand exchange is a common method for NC functionalization, but often requires multiple steps.
Purpose of the Study:
- To develop a facile, single-step method for functionalizing semiconductor nanocrystals (NCs) with peptides.
- To create stable, bright, and biocompatible NCs for advanced biomedical applications.
Main Methods:
- Developed a single-step ligand exchange process using custom-designed peptides for NC surface functionalization.
- Applied the peptide-coating technique to various core and core-shell NCs across the visible and near-infrared spectrum.
- Utilized fluorescence correlation spectroscopy (FCS) for rapid assessment of colloidal and photophysical properties.
Main Results:
- Achieved small, monodisperse, highly stable, water-soluble NCs with retained brightness and photostability.
- Demonstrated immediate biocompatibility of peptide-coated NCs.
- Showcased the versatility of the peptide coating for property enhancement and multi-functionalization.
Conclusions:
- The peptide-coating strategy offers a robust and versatile platform for developing advanced semiconductor nanocrystal probes.
- Functionalized NCs are suitable for critical biomedical applications, including live-cell single-particle tracking and combined fluorescence/PET imaging.
