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Dextran-Functionalized Semiconductor Quantum Dot Bioconjugates for Bioanalysis and Imaging.

Kelly Rees1, Michael V Tran1, Melissa Massey1

  • 1University of British Columbia, Department of Chemistry, 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada.

Bioconjugate Chemistry
|February 22, 2020
PubMed
Summary
This summary is machine-generated.

Dextran functionalization enhances colloidal semiconductor quantum dots (QDs) for biological uses. This study demonstrates versatile bioconjugation strategies for QDs, improving their stability and applicability in assays and imaging.

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Area of Science:

  • Nanotechnology and Materials Science
  • Biotechnology and Biomedical Engineering
  • Optical Physics

Background:

  • Effective surface functionalization and bioconjugation are crucial for optimizing colloidal semiconductor quantum dots (QDs) in biological applications.
  • Dextran functionalization, while successful for other nanoparticles, has seen limited application with QDs.

Purpose of the Study:

  • To report the preparation, characterization, and proof-of-concept applications of dextran-functionalized QDs.
  • To evaluate multiple dextran ligand approaches for colloidal stability, non-specific binding, and cellular compatibility.
  • To demonstrate diverse bioconjugation strategies for tailored QD applications.

Main Methods:

  • Preparation and characterization of dextran-functionalized QDs.
  • Evaluation of colloidal stability across various pH levels.
  • Assessment of non-specific protein and cell binding.
  • Microinjection into cells and viability assays.
  • Bioconjugation via covalent coupling, polyhistidine-peptide binding, and tetrameric antibody complex (TAC) binding.

Main Results:

  • Dextran ligands were successfully prepared and characterized for QD functionalization.
  • Optimized ligands demonstrated good colloidal stability and low non-specific binding.
  • Functionalized QDs were successfully applied in pH sensing, proteolytic activity assays, immunoassays, and cell imaging.

Conclusions:

  • Dextran ligands are highly promising for functionalizing quantum dots for biological applications.
  • Ligand design is tailorable to meet specific application requirements.
  • This work expands the utility of QDs in biological sensing, diagnostics, and imaging.