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Intracellular imaging with a graphene-based fluorescent probe.

Cheng Peng1, Wenbing Hu, Yuntao Zhou

  • 1Laboratory of Physical Biology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|July 6, 2010
PubMed
Summary

Researchers developed fluorescein-functionalized graphene oxide (GO) using a polyethylene glycol (PEG) bridge for enhanced intracellular imaging. This novel nanoprobe shows pH-tunable fluorescence and efficient cellular uptake, overcoming GO-induced quenching.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Biomedical Engineering

Background:

  • Graphene oxide (GO) is a versatile nanomaterial for functionalization.
  • GO's potential for imaging is limited by quenching of attached fluorophores.
  • Polyethylene glycol (PEG) can act as a spacer to mitigate quenching.

Purpose of the Study:

  • To synthesize fluorescein-functionalized GO using a PEG bridge for intracellular imaging.
  • To evaluate the pH-tunable fluorescent properties of the conjugate.
  • To assess the efficacy of the conjugate as a nanoprobe for cellular imaging.

Main Methods:

  • Synthesis of fluorescein-PEG-GO conjugate.
  • Characterization of fluorescent properties, including pH-dependence.

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  • Cellular uptake studies and intracellular imaging experiments.

    • Main Results:

    • Successful synthesis of fluorescein-PEG-GO conjugate.
    • Demonstrated pH-tunable fluorescence, with reduced quenching compared to direct conjugation.
    • Efficient cellular uptake and successful intracellular imaging using the developed nanoprobe.

    Conclusions:

    • The fluorescein-PEG-GO conjugate is a promising tool for intracellular imaging.
    • The PEG bridge effectively prevents GO-induced quenching of fluorescein.
    • This approach offers a new strategy for developing functional graphene-based nanoprobes.