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Related Concept Videos

Immunofluorescence Microscopy01:12

Immunofluorescence Microscopy

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A fluorescence microscope uses fluorescent chromophores called fluorochromes, which can absorb energy from a light source and then emit this energy as visible light. Fluorochromes include naturally fluorescent substances (such as chlorophylls) and fluorescent stains that are added to the specimen to create contrast. Dyes such as Texas red and FITC are examples of fluorochromes. Other examples include the nucleic acid dyes 4’,6’-diamidino-2-phenylindole (DAPI), and acridine orange.
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Related Experiment Video

Updated: Dec 25, 2025

Compact Quantum Dots for Single-molecule Imaging
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Dextran-Functionalized Quantum Dot Immunoconjugates for Cellular Imaging.

Kelly Rees1, Melissa Massey1, Michael V Tran1

  • 1Department of Chemistry, University of British Columbia, Vancouver, BC, Canada.

Methods in Molecular Biology (Clifton, N.J.)
|April 5, 2020
PubMed
Summary
This summary is machine-generated.

Semiconductor quantum dots (QDs) were coated with dextran for improved biocompatibility in cellular imaging. Dextran-coated QDs successfully labeled HER2 receptors on breast cancer cells, demonstrating their utility in diagnostics.

Keywords:
DextranFluorescenceImagingImmunoconjugateQuantum dotTetrameric antibody complex

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Cellular Imaging

Background:

  • Semiconductor quantum dots (QDs) offer excellent optical properties for cellular imaging.
  • Biocompatible surface coatings are crucial for QD stability and minimizing non-specific interactions.
  • Dextran coatings are ideal for achieving hydrophilic and biocompatible surfaces on nanomaterials.

Purpose of the Study:

  • To develop and characterize dextran coatings for semiconductor quantum dots (QDs).
  • To create dextran-QD immunoconjugates for targeted cellular labeling.
  • To demonstrate the application of these immunoconjugates in imaging cancer cells.

Main Methods:

  • Synthesis and characterization of dextran ligands for QDs.
  • Preparation of immunoconjugates using tetrameric antibody complexes (TAC).
  • Immunofluorescent labeling and imaging of SK-BR3 breast cancer cells.

Main Results:

  • Successfully synthesized and characterized dextran-coated QDs.
  • Developed functional immunoconjugates capable of targeting specific cell surface receptors.
  • Demonstrated effective immunofluorescent imaging of HER2 on SK-BR3 cells.

Conclusions:

  • Dextran coatings provide a viable strategy for enhancing the biocompatibility and applicability of QDs in biological systems.
  • Dextran-QD immunoconjugates are effective tools for targeted cellular imaging and analysis.
  • This approach holds promise for advancing cancer diagnostics and research.