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Download fileTempo-Spatially Resolved Scattering Correlation Spectroscopy under Dark-Field Illumination and Its Application to Investigate Dynamic Behaviors of Gold Nanoparticles in Live Cells
journal contribution
posted on 2014-02-19, 00:00 authored by Heng Liu, Chaoqing Dong, Jicun RenIn this study, a new tempo-spatially
resolved fluctuation spectroscopy
under dark-field illumination is described, named dark-field illumination-based
scattering correlation spectroscopy (DFSCS). DFSCS is a single-particle
method, whose principle is similar to that of fluorescence correlation
spectroscopy (FCS). DFSCS correlates the fluctuations of the scattered
light from single nanoparticle under dark-field illumination. We developed
a theoretical model for translational diffusion of nanoparticles in
DFSCS system. The results of computer simulations documented that
this model was able to well describe the diffusion behaviors of nanoparticles
in uniformly illuminated field. The experimental setup of DFSCS was
achieved by introducing a dark-field condenser to the frequently used
bright-field microscope and an electron multiplying charge-coupled
device (EMCCD) as the array detector. In the optimal condition, a
stack of 500 000 frames were collected simultaneously on 64
detection channels for a single measurement with acquisition rate
of 0.5 ms per frame. We systematically investigated the effect of
certain factors such as particle concentration, viscosity of the solution,
and heterogeneity of gold nanoparticles (GNPs) samples on DFSCS measurements.
The experiment data confirmed theoretical model proposed. Furthermore,
this new method was successfully used for investigating dynamic behaviors
of GNPs in live cells. Our preliminary results demonstrate that DFSCS
is a practical and affordable tool for ordinary laboratories to investigate
the dynamic information of nanoparticles in vitro as well as in vivo.
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Keywords
fluorescence correlation spectroscopy500 000 framesDFSCS measurementsDFSCS systemScattering Correlation SpectroscopyLive CellsInexperiment dataarray detectoracquisition rateInvestigate Dynamic Behaviorstranslational diffusionGold NanoparticlesEMCCD64 detection channelsFCScomputer simulations0.5 mscorrelation spectroscopyGNPdiffusion behaviorsgold nanoparticlesparticle concentrationfluctuation spectroscopymodelDFSCS correlates500 000