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Related Concept Videos

Labeling DNA Probes03:31

Labeling DNA Probes

DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
Radioisotopes, fluorophores, or small molecule binding partners like biotin or digoxigenin, are the most widely used reporter tags for labeling DNA probes. These labels can be attached to the probe DNA molecule via...

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Genetic Barcoding with Fluorescent Proteins for Multiplexed Applications
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Predefinable colorimetric quantum-dot barcodes with simple and express identification algorithm.

Bo Wu1, Hai-Qing Gong

  • 1School of Mechanical & Aerospace Engineering, Nanyang Technological University, Singapore.

Applied Optics
|February 7, 2013
PubMed
Summary
This summary is machine-generated.

Researchers developed novel colorimetric barcodes using quantum-dot (Qdot) mixtures within microcapsules for precise identification. These Qdot barcodes enable high-throughput multiplexed assays in biological screening applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Analytical Chemistry

Background:

  • Microcapsules offer versatile platforms for encapsulating various materials.
  • Quantum dots (Qdots) provide unique fluorescent properties for labeling and detection.
  • Developing robust and easily identifiable barcodes is crucial for high-throughput screening.

Purpose of the Study:

  • To create novel colorimetric barcodes using Qdot-loaded microcapsules for small object identification.
  • To establish a method for predefining barcode compositions based on Qdot mixtures.
  • To demonstrate the utility of these barcodes in high-throughput multiplexed assays.

Main Methods:

  • Loading mixtures of Qdots with distinct emission peaks into liquid cores of monodispersed polymer microcapsules.
  • Characterizing the linear relationship between Qdot concentration and emission intensity.
  • Utilizing a simple algorithm to record and analyze emission intensities for barcode identification via flow cytometry.

Main Results:

  • Specific fluorescent profiles were successfully generated, acting as unique colorimetric barcodes.
  • Emission intensities showed a linear correlation with Qdot concentrations, ensuring predictable barcode signals.
  • Minimal spectral interference was observed between Qdots with different emission peaks, allowing for distinct barcode definition.
  • The encoded microcapsules were easily identified using flow cytometry and a straightforward algorithm.

Conclusions:

  • Qdot-loaded microcapsules serve as effective colorimetric barcodes for object identification.
  • The predefined Qdot compositions allow for the creation of a library of unique barcodes.
  • This technology is well-suited for high-throughput multiplexed assays, particularly in biological screening.