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Keywords:

  • Biomarker;
  • cancer stem cell;
  • darkfield imaging;
  • functionalization;
  • monoclonal antibody;
  • nanosphere;
  • poly(ethylene glycol);
  • supercontinuum

Abstract

We present a new hyperspectral darkfield imaging system with a scanned broadband supercontinuum light source. We observed the specific attachment of the functionalized gold plasmonic nanoparticles (AuNPs) targeting CD44+ human breast cancer cells by conventional and by proposed hyperspectral darkfield microscopy. This wide-field and low phototoxic hyperspectral imaging system has been successful for performing spectral three-dimensional (3D) localization and spectroscopic identification of CD44-targeted PEGylated AuNPs in fixed cell preparations. Such spatial and spectral information is essential for the improvement of nanoplasmonic-based imaging, disease detection and treatment in complex biological environment. Presented system capability for 3D NP tracking will also enable investigation of specific sub-cellular activity with the use of NPs as spectral sensors. (© 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)