Open AccessTwo-photon fluorescence correlation spectroscopy of lipid-encapsulated fluorescent nanodiamonds in living cells
Author(s) -
Yuen Yung Hui,
Bailin Zhang,
Yuan-Chang Chang,
Cheng-Chun Chang,
HuanCheng Chang,
Jui-Hung Hsu,
Karen L. Chang,
Fi-John Chang
Publication year - 2010
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.005896
Subject(s) - fluorescence correlation spectroscopy , fluorescence , materials science , nanodiamond , two photon excitation microscopy , spectroscopy , autofluorescence , fluorescence lifetime imaging microscopy , microscopy , nanoparticle , luminescence , fluorescence microscope , diamond , optics , optoelectronics , nanotechnology , physics , quantum mechanics , composite material
Dynamics of fluorescent diamond nanoparticles in HeLa cells has been studied with two-photon fluorescence correlation spectroscopy (FCS). Fluorescent nanodiamond (FND) is an excellent fluorescent probe for bioimaging application, but they are often trapped in endosomes after cellular uptake. The entrapment prohibits FCS from being performed in a time frame of 60 s. Herein, we show that the encapsulation of FNDs within a lipid layer enhances the diffusion of the particles in the cytoplasm by more than one order of magnitude, and particles as small as 40 nm can be probed individually with high image contrast by two-photon excited luminescence. The development of the technique together with single particle tracking through one-photon excitation allows probing of both short-term and long-term dynamics of single FNDs in living cells.