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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.
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Polymer-coated nanoparticles: a universal tool for biolabelling experiments.

Feng Zhang1, Emma Lees, Faheem Amin

  • 1Fachbereich Physik and Wissenschaftliches Zentrum für, Materialwissenschaften, Philipps Universität Marburg, Marburg, Germany.

Small (Weinheim an Der Bergstrasse, Germany)
|September 20, 2011
PubMed
Summary

Researchers developed a versatile method for making nanoparticles water-soluble using amphiphilic polymers. This technique enables new applications, including intracellular pH sensing with functionalized nanoparticles.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Biomedical Engineering

Background:

  • Water solubility is crucial for nanoparticle applications in biological systems.
  • Existing nanoparticle solubilization methods have limitations.
  • Developing universal strategies for nanoparticle phase transfer is essential.

Purpose of the Study:

  • To review phase-transfer strategies for nanoparticle solubilization.
  • To present a generic method for transferring various nanoparticles to aqueous environments.
  • To demonstrate novel functionalities of polymer-capped nanoparticles for biological sensing.

Main Methods:

  • Coating hydrophobic nanoparticles with amphiphilic polymers.
  • Functionalizing polymer coatings with maleimide groups for further conjugation.
  • Attaching pH-sensitive fluorophores to polymer-capped nanoparticles.

Main Results:

  • Amphiphilic polymer coating enables phase transfer of diverse nanoparticles (semiconductor, magnetic, metallic, upconverting).
  • Maleimide-functionalized polymers allow for tailored nanoparticle surface chemistry.
  • Demonstrated successful intracellular pH sensing using nanoparticle-fluorophore conjugates.

Conclusions:

  • Amphiphilic polymer coating is a robust strategy for nanoparticle water solubilization.
  • Functionalized polymer-capped nanoparticles offer tunable properties for advanced applications.
  • This approach facilitates the development of novel biosensors and diagnostic tools.